WO2002082271A1 - Copyright detection and protection system and method - Google Patents
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- WO2002082271A1 WO2002082271A1 PCT/US2002/010615 US0210615W WO02082271A1 WO 2002082271 A1 WO2002082271 A1 WO 2002082271A1 US 0210615 W US0210615 W US 0210615W WO 02082271 A1 WO02082271 A1 WO 02082271A1
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Definitions
- the field of the present invention relates to processing digital data. More particularly, the field of the present invention relates to identifying, reporting and/or protecting digital works from unauthorized transmission and/or copying, such as over networks or network segments connected to the Internet.
- copyright owners In response to the growing copyright infringement problem tied to unregulated peer- to-peer file sharing, copyright owners have sought and obtained legal relief, including injunctive relief, against peer-to-peer facilitators such as Napster. Some copyright owners have further requested that network operators, including colleges and universities, block affiliated with them receive no payment for distribution of copyrighted works on an unprecedented scale.
- copyright owners In response to the growing copyright infringement problem tied to unregulated peer- to-peer file sharing, copyright owners have sought and obtained legal relief, including injunctive relief, against peer-to-peer facilitators such as Napster. Some copyright owners have further requested that network operators, including colleges and universities, block access to peer-to-peer sites to prevent further copyright infringement. At the same time, however, there exist substantial non-infringing uses for peer-to-peer file sharing, including exchange of creative works that exist in the public domain (such as may exist through expiration or abandonment of copyrights, for example) and/or uses that have been expressly permitted. If aggrieved copyright owners prevail in their legal battles against peer-to-peer facilitators, then such facilitators may be forced to stop operating irrespective of the content they provide.
- a potential alternative to relying on file naming technology for identifying digital works on computer networks is an identification technology known as watermarking.
- a watermark is digital information that is embedded into a file in such a way that it does not affect human perception of the content but is easily detectable by machines.
- One advantage offered by watermarking is its easy recognition.
- drawbacks of watermarking technology include its inability to protect the huge amount of previously released audio content, and its susceptibility to hacking. Once a watermark is disabled or removed from a creative work by a hacker, the resulting product is unprotected.
- CBID content-based identification
- Various CBID techniques may be used to characterize the qualities of sound perceived by a listener.
- a typical approach is to analyze the spectrum of a sound, such as by measuring the loudness of each frequency contained in a multi-frequency sound.
- a more compact CBID technology involves creation of a "fingerprint" from a creative work that is compact from a data perspective, yet preserves distinguishing characteristics that may be used to positively identify a unique audio file.
- Many simple fingerprinting methods have been developed, such as spectral averaging, for example. In using these simpler methods, however, a substantial amount of information about the audio work is lost.
- Great care must be taken in applying a particular CBID method for a number of reasons: not only to ensure only accurate identification, but also to ensure that compressed versions of an audio file can be identified, and to avoid known evasion techniques such as adding a small segment to the beginning of an audio file.
- a more sophisticated CBID technology would be appropriate to address these concerns.
- U.S. Patent No. 5,918,223 issued to Blum et al., the disclosure of which is hereby incorporated by reference as if fully set forth herein.
- the patent provides a system and method for performing analysis and comparison of audio data files based upon the content of the data files.
- U.S. Patent No. 5,918,223 by itself does not address a comprehensive solution to regulating distribution of digital copyrighted works.
- U.S. Patent No. 5,918,223 expressly relates to audio information, and does not address the similar but distinct problems with regulating online distribution of copyrighted works such as motion pictures, still images, games, software, and other media.
- photo communities are quickly becoming a favorite new tool of online users, as such communities allow users to post, print, and share their photos online with other subscribers.
- the explosive growth in digital camera use has greatly expanded the popularity of these photo communities. While many sites promote their usefulness in sharing family moments and other important events online, some estimates provide that, in reality, half of all images posted on these sites are copyright-protected images, and are being posted, printed and shared illegally.
- peer-to-peer file sharing technology offers unprecedented ease in exchanging information over digital networks. Unfortunately, this technology also permits intellectual property rights to be infringed on a widespread scale. Without a comprehensive protection system in place to prevent further infringement of intellectual property rights, if intellectual property owners prevail in their ongoing legal battles against peer-to-peer providers, then the benefits of peer-to-peer file sharing may be lost to everyone. In light of all of the considerations discussed above, it would be desirable to provide a reliable and secure system for enabling intellectual property owners to distribute digital materials while preventing infringement of intellectual property rights. Preferably, such a system would permit intellectual property owners to choose whether distribution of particular works should be unrestricted, restricted, or disallowed entirely.
- FIG. 1 is a high-level schematic of a copyright protection system according to a first embodiment.
- FIG. 2 is a sample report generated by a copyright protection system, the report including several data fields useful to record a transmission transaction.
- FIG. 3 is component architecture schematic for a portion of a copyright protection system directed to monitoring a multi-session digital signal.
- FIG. 4 is a schematic of a copyright protection system including implementation details for content type recognition and identification, in accordance with a second embodiment.
- FIG. 5 is a schematic of a copyright protection system according to a third embodiment.
- FIG. 6 is a process flow diagram for a hierarchical method useful with a copyright protection system to assess whether a digital file contains a registered copyrighted work.
- FIG. 7 is a process flow diagram for obtaining and entering information useful to a copyright protection system into a database.
- FIG. 8 is a schematic of a copyright protection system having a distributed architecture for monitoring multiple watched networks.
- FIG. 9 is a process flow diagram for a method of conducting a business enterprise through the provision of copyright protection services or a copyright protection system.
- FIG. 10 is a generalized data flow diagram for use with a Stochastic Audio Matching Mechanism.
- FIG. 11 is a process flow diagram for extracting feature vectors comprising Mel Frequency Cepstral Coefficients.
- FIG. 12a is a first portion of an annotated sequence diagram for extracting features from a digital audio work according to a Stochastic Audio Matching Mechanism.
- FIG. 12b is a second portion of the annotated sequence diagram of FIG. 12a.
- FIG. 13a is a graph plotting frequency versus time for a first musical piece performed by a first artist.
- FIG. 13b is a graph plotting frequency versus time for a second musical piece performed by a second artist.
- FIG. 14 is an annotated sequence diagram for generating a model from a digital audio work according to a Stochastic Audio Matching Mechanism.
- FIG. 15 is an annotated sequence diagram for identifying a digital audio work according to a Stochastic Audio Matching Mechanism.
- FIGS. 16-21 illustrate examples of screenshots that may be viewed by an intended recipient of unauthorized content in the context of a peer-to-peer file-sharing network.
- FIG. 1 generally illustrates a copyright protection system ("CPS") 100 according to a first embodiment for monitoring a network segment 102 bearing at least one packet-based digital signal in accordance with one aspect of the CPS 100.
- the monitoring point for a data transaction may be at points other than a network segment of a communication.
- the monitoring point of the CPS may be a server on a community website that monitors the uploads of audio, image, video or other digital content. The same community website may alternatively monitor downloads of such data.
- the monitoring point may be a peer or client computer in a peer-to-peer file sharing network.
- the CPS 100 may be integrated or linked with a search engine such as Excite® or Infoseek® that monitors search requests and performs one or more of the actions of monitoring, recording or blocking based on the nature of the request and the likelihood that it involves transacting copyright protected material.
- the network segment 102 is routed through a network appliance 104 that monitors digital signals borne by the segment 102. While FIG. 1 suggests that the network appliance 104 receives in-stream communications from the network segment 102, in other embodiments the network appliance 104 may alternatively receive mirrored data from a network. For an in- stream configuration such as is suggested by FIG.
- each network appliance 104 would typically communicate with the network segment 102 through a router (not shown) having content recognition capability, such as routers commercially available from companies such as Cisco Systems or Alteon WebSystems (product information available at http://www.cisco.com and http://www.a1teonwebsystems.com. respectively).
- any digital signals borne by the network segment 102 are periodically sampled to obtain a frame of sample data on each occasion.
- various window periods may be used for each frame, but each frame advantageously contains several milliseconds of data.
- a sampled frame is provided to a content recognizer 116, preferably part of the network appliance 104 that recognizes defined content types. Exemplary content types include .mp3, .avi, .asf, .ogg, but searching and recognition of practically any recognizable file type bearing audio, video, or image data, or digital text, or software, may be addressed by the content recognizer 116.
- a sampled frame is then provided to a media analysis system 126.
- the purpose of the media analysis system 126 is to assess the content of a digital file. While content may be determined according to different methods, one desirable method is to use digital content-based fingerprinting if sufficient processing resources are available.
- a fingerprint is generated for the frame by the media analysis system 126 to aid in identifying the content of the frame. A generated fingerprint may then be compared with an archive of fingerprints for registered copyrighted works.
- "Registered copyrighted works" as used herein refers to digital works registered with or by a CPS provider or service provider.
- a fingerprint archive suggests that, in a preferred embodiment, copyrighted works should be registered with the provider of the CPS 100, and reference fingerprints should be generated from registered copyrighted works, before seeking to detect the transmission of particular works in a network segment 102. If the comparison between the fingerprint of the frame and an archived fingerprint yields a match, thus signifying the transmission of a registered copyrighted work along the network segment 102, then transmission information is recorded in a content transmission recording device 110.
- a) Source IP Address the Internet Protocol (IP) address from which the recognized content was transmitted; b) Destination IP Address: the IP address to which the recognized content was transmitted; c) Date Transmitted: the date the recognized media was transmitted; d) Time Transmitted: the time the recognized media was transmitted; e) Content / Media Name: The name or title of the content whether audio, video, still image, or other type; f) Artist Name: The name of the artist (when appropriate) if the work is a copyrighted work already registered with the CPS provider; g) Album Name: The name of an album (if appropriate) associated with a registered copyrighted (e.g., audio) work; h) Record Label: The name of an album (if appropriate) associated with a registered copyrighted (e.g., audio) work; i) Various Meta-Data: Distributor name, producer name
- FIG. 3 illustrates a preferred embodiment of a component architecture for a portion 280 of a CPS 100, such as the CPS 100 depicted in FIG. 1, the illustrated portion 280 being useful for monitoring a multi-session signal such as may be transmitted along a high bandwidth network segment.
- a high bandwidth network connection 262 preferably anticipated to operate at a convenient, commercially available speed, preferably greater than 28 kbps, communicates at least one packet-based digital signal to a first statefull session-binding load balancer 264 that separates the greater network stream into individual TCP or UDP sessions and binds those sessions to a specific processing unit (e.g., 268, 269, or 270) in the next layer.
- Connections 265, 266, 267 communicate individual network sessions to content-type recognition and identification servers 268, 269, 270, each having at least one processor.
- Each server 268, 269, 270 which preferably includes at least one processor, executes content-type recognition and content identification services.
- the raw IP data packets are assembled (or re-assembled), the packets are analyzed for presence of media types likely to contain copyrighted content using a content type recognition service, and the media content is identified using a content identifier service.
- the servers 268, 269, 270 preferably have further connections (remote or local) to a stored data repository to facilitate content comparison with known identifiers for copyrighted content using one or more processors.
- packets may be communicated to a second statefull session-binding load balancer 274 that reassembles the various separated packets into a single network stream 275.
- a second load balancer 274 to reassemble the separated packets into a single network stream 275 is generally only necessary if the portion 280 of the CPS 100 depicted in FIG. 3 is configured to operate in-stream.
- the high bandwidth network connection 262 would typically be provided to the load balancer 264 by way of a router (not shown).
- the second load balancer 274 would be unnecessary, as there would be no need to reassemble separated packets into a single network stream 275 as the data is generally already streamed to its intended destination.
- additional redundant load balancers 264, 274, servers 268, 269, 270, and/or connections 265, 266, 267, 271, 272, 273 may be provided to provide failover (backup) capability in case one or more primary devices should fail.
- FIG. 4 depicts a preferred embodiment of a detailed implementation of a CPS 100, 200, omitting (for the sake of simplicity) load balancing devices such as are shown in FIG. 3 to focus on a single session.
- the network appliance 204 may be characterized as a server, and the various operational blocks contained within the appliance 204 may be characterized as services, each amenable to at least partial performance in software routines.
- the network appliance 204 includes at least one processor that, in conjunction with memory, operates software code for performing various operations on the digital signal.
- the processor may comprise any type of computer, and has processing characteristics dependent upon processing requirements for performing the various tasks discussed herein. It may comprise, e.g., a computer, such as a workstation including the type manufactured by Sun Microsystems, a main frame computer, or a personal computer such as the type manufactured by IBM ® or Apple ® .
- processor refers to a wide variety of computational devices or means including, for example, using multiple processors that perform different processing tasks or have the same tasks distributed between processors.
- the processor(s) may be general purpose CPUs or special purpose processors such as are often conventionally used in digital signal processing systems. Further, multiple processors may be implemented in a server-client or other network configuration, as a pipeline array of processors, etc. Some or all of the processing is alternatively implemented with hard-wired circuitry such as an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other logic device.
- ASIC application-specific integrated circuit
- FPGA field programmable gate array
- the term “memory” refers to any storage medium that is accessible to a processor that meets the memory storage needs for a system or system component for performing the functions described herein.
- the memory buffer is random access memory (RAM) that is directly accessed by the processor for ease in manipulating and processing selected portions of data.
- the memory store comprises a hard disk or other non-volatile memory device or component.
- the network appliance 204 may be installed either in series with or receiving mirrored data from a high bandwidth network segment.
- a packet input receiver 206 accepts the input of a network data stream 202.
- a TCP stream buffering / assembly service 206 that identifies the packet type of the input signal, and if the type is TCP, also provides storage buffering as needed and assembles the synchronized packet stream.
- a data extraction service 210 extracts the data from synchronized network packets, and then a data buffering service 212 assembles and buffers the data from the incoming packets.
- a content lookup service 214 communicates part or all of the data to a content type recognizer service 216.
- the content type recognizer 216 preferably has multiple associated recognizers 218, 220, 222, 224, 225 to recognize file types of interest including, for example, .mp3, .avi, .asf, .ogg, and other types, respectively.
- packets are forwarded to a remote or local content identifier service 226 preferably having multiple associated identifiers 228, 230, 232, 234, and 235 to identify content borne by file types of interest including, for example, .mp3, .avi, .asf, .ogg, and other types, respectively.
- the content identifier service 226 is linked to a finge ⁇ rint generator service 240. While the fingerprint generator service 240 is illustrated as a distinct service from the content identifier 226, the two services optionally may advantageously be combined.
- a content-based finge ⁇ rint comprising identifying features may be generated for a frame of data, and then forwarded to a content comparator 242.
- the content identifier 226 preferably includes a separate link to the content comparator 242 that is independent from the finge ⁇ rint generator 240.
- the content comparator 242 is in communication with a database 244 of stored content identifiers, preferably by a high-speed network connection.
- the database 244 preferably includes database software such as is commercially available from Oracle ® Co ⁇ oration operating on one or more high-speed computers with expandable high-speed storage capability.
- the database 244 contains stored content-based identifiers, preferably including finge ⁇ rints, for copyrighted works registered with a CPS provider such as ipArchiveTM.
- the CPS provider when a copyrighted song is registered with or by a CPS provider, the CPS provider would generate entries in the database 244 to assist in identifying the song, preferably including at least one finge ⁇ rint from the song's content according to a CBID method, such as the method disclosed in U.S. Patent No. 5,918,223 issued to Blum et al.
- the CPS provider preferably indexes identifiers including finge ⁇ rints to registered works in the database 244.
- Finge ⁇ rints may be generated with a content identifier 226 with finge ⁇ rint generator 240, or with a media analysis system 326 such as provided in FIG. 5.
- the content comparator 242 its function is to compare a content identifier (such as, for example, a finge ⁇ rint generated by the finge ⁇ rint generator 240) from the incoming data stream 202 and query the database 244 for stored identifiers for registered copyrighted works, and then determine whether the incoming data stream 202 matches with any archived content. If a match is found, then further actions may be necessary based on business rules associated with the identified content of, the data stream 202. Information identifying users, destination addresses, and/or passwords authorized to receive registered copyrighted content may be stored with the database 244, or, more preferably, in a separate database (not shown) communicating with the content comparator 242. The user/address/password information may be queried by the content comparator 242 to determine whether the data stream 202 is authorized.
- a content identifier such as, for example, a finge ⁇ rint generated by the finge ⁇ rint generator 240
- a content transmission reporter 245 is preferably provided to record transmission information for copyright enforcement, record keeping, or other pu ⁇ oses. Information such as is listed above in connection with FIG. 2 may be stored, and reports such as the exemplary report provided in FIG. 2 may be generated. If the data stream 202 is not authorized, then one or more actions may be taken according to pre-defined business rules. Actions that might be taken according to pre-defined business rules, either separately or one or more in combination include, for example, recording, reporting and/or blocking a transmission, sending a generalized message to the source and/or recipient addresses involved with the unauthorized transaction, and sending a message informing a recipient address of (or redirecting a recipient address to) a commercial site where the desired copyrighted work may be purchased.
- a message generator 246 in communication with a packet output service or transmitter 250 is preferably provided.
- messages are transmitted by way of an instant messaging protocol, such as the instant messenger associated with software distributed by www.napster.com. or AOL ® .
- An alternative means for transmitting a message to a user is to send a message to a client application on the computer desktop of a user intended to receive the content, the client application including some communication capability.
- the CPS may detect an available client application, and then send the message accordingly.
- the system may detect an Internet Explorer ® on the user's desktop and send an HTML message to the user via the user's Internet Explorer ® .
- a transmitted message preferably provides instructions, or, more preferably, a link to a commercial site, for purchasing a license to the copyrighted work.
- the recipient of the message is provided the option of contesting the blocking of the content. If the recipient chooses to contest the block, a return message is sent to the CPS 100, which then may immediately commence transmission of the digital data to the recipient. Alternatively, the CPS 100 may forward the contested data stream for additional identification processing or to an administrator of the CPS for review.
- the recipient is provided a small sample of both the transmitted content and the content to which it matched to enable the recipient to make an evaluation of whether to contest the block.
- FIGS. 16-21 illustrate examples of screenshots that may be viewed by an intended recipient of unauthorized content in the context of a peer-to-peer file-sharing network.
- FIGS. 16 and 17 depict examples of screenshots as may be viewed by a user using a peer-to- peer file sharing client application (FIG. 16 for Napster and FIG. 17 for iMesh). The screenshots depict a list of songs that the intended recipient may choose to receive.
- a file sharing client application e.g., such as for Napster
- the intended recipient may view a "Transfer error!” message on the client application. In one embodiment, this may be the complete and only message that is communicated b the CPS to the intended recipient. The intended recipient may not even be aware that the content has been affirmatively blocked, as the message may appear to indicate a communication problem or fault. Similarly, in FIG. 19, the message received is "Timed out!,” which may or may not indicate to the content's intended recipient the reason for the failed transmission of the content. The specific action taken may depend on business rules associated with the content. The business rule may be construed to only report on the transmission and take no action to interfere with the transmission. FIGS.
- FIG. 20 and 21 depicts examples of screenshots of windows that, in one alternative embodiment, may be presented to an intended recipient of unauthorized content.
- the windows preferably provide options to the viewer for obtaining the desired content from other sources, which are authorized to distribute the desired content, although typically for a fee.
- Blocking or interrupting an unauthorized transmission may also be performed by way of the message generator 246, such as by transmitting a TCP/IP reset.
- This well-known technique is a form of IP spoofing in which the message generator 246 alternately gives the appearance that it is the transmitting device and the receiving device associated with a transaction, and then forges packets designed to terminate a TCP stream.
- an unlicensed and unauthorized destination address or recipient may be prevented from receiving full transmission of a specific registered copyrighted work.
- the forged packets are independent of any assembled content-bearing packets that may also be provided from the packet output service or transmitter 250 to a continued network traffic stream 260.
- a continued network stream 260 suggests that the network appliance 204 is installed in-stream along a network segment.
- the appliance 204 may also be configured to receive mirrored network data, in which case the need to continue transmission of reassembled packets through the packet output service or transmitter 250 to a continued network stream 260 may be reduced or obviated.
- FIG. 5 is a schematic representation of an alternative copyright protection system 300.
- An incoming network stream 302 connected to the Internet 301 is routed to a media recognition system 316 provided at a network watchpoint.
- the media recognition system 316 includes an input receiver (not shown) for receiving an incoming network stream 302. If the media recognition system 316 is placed in-stream to capture all network communications, then an output transmitter (not shown) for transmitting the continued network stream 303 en route to a watched network 305 is preferably provided.
- the media recognition system 316 may also be configured to receive a mirrored network data stream according to conventional techniques. An in-stream approach requires additional, often expensive routing hardware (not shown), and may have a potential drawback of introducing latency into the monitored network stream.
- a potential benefit of an in-stream approach is that it may facilitate blocking of an entire transmission before any portion of it is transmitted to the watched network.
- the latter approach implemented using mirrored network data, is preferred if it can be implemented at sufficient speed to render it effective at identifying and taking action against unauthorized transactions before such transactions are completed.
- multiple networks may be monitored by the copyright protection system 300 with additional media recognition systems 316 (such as embodied in the multiple network appliances 602, 604, 606, 608 shown in FIG. 8) each monitoring a segment of a different network but communicating with common analysis systems and/or a common transaction request broker.
- Each media recognition system 316 advantageously monitors a network 305 for traffic in digital files such as, for example, video, audio, image files and other digital content. If a file type of interest is detected by the media recognition system 316, then any portion of the signal bearing such a file may be provided to the content analysis system 326 to perform content identification.
- separate media analysis subsystems 328, 330, 332 are provided for analyzing images, audio, and video or other media (including software) respectively.
- Image identification may be facilitated by use of the Ereo Exacta-Match system, developed by and commercially available from Ereo. Audio identification may be performed by application of the methods disclosed in U.S. Patent No. 5,918,223, issued to Blum et al. or alternatively with the Stochastic Audio Matching Mechanism (SAMM) discussed below. Video identification may be facilitated by applying one or both of the above-mentioned CBID methods to the audio portion of the video file, if any. Other digital works, such as digital text or software, may be identified by any number of methods as are known in the art.
- SAMM Stochastic Audio Matching Mechanism
- the media analysis system 326 preferably includes a capability of generating CBID finge ⁇ rints for digital media, whether such media is obtained from an incoming network stream 302 by way of the media recognition system 316, or obtained from a raw media storage service 340.
- the media analysis system 326 also includes storage capability to store content identifiers or finge ⁇ rints for registered copyrighted works, such as may be stored in and forwarded by the raw media storage service 340.
- the media storage service 340 preferably contains a raw media storage archive or database 338 and a raw media storage system manager 339 for managing transactions with the archive or database 338.
- a further function of the system 326 is to compare identifiers, preferably including finge ⁇ rints, extracted from the network stream 302 and from registered copyrighted works (such as are stored in the media storage service 340) to determine whether the network stream 302 contains any registered copyrighted content. If the media analysis system 326 finds a match in making this comparison, then it may forward information regarding the transaction to a transaction database service 344.
- a database 345 stores all media received by the media analysis system 326.
- the database 345 is preferably relational to facilitate dimensional reporting, and preferably also permits high volume updates.
- a transaction recording and management service 343 is provided to manage queries to the database service 344 and also to manage data recordation in the database 345.
- a data enrichment service 347 in communication with the database service 344 is provided to facilitate either automatic or manual addition of information potentially useful to the CPS (such as according to the method provided in FIG. 7).
- a transaction reporting service 348 also is communication with the database service 344, is preferably provided to define and execute queries for generating reports including, for example, the transaction information provided in FIG. 2.
- transaction reports may be sold by the CPS provider to owners of copyrighted works to communicate information useful for maximizing opportunities and revenue from the copyrighted works.
- An urgent or scheduled report forwarding service 349 is preferably provided and in communication with the transaction reporting service 348 to coordinate generation of urgent or scheduled reports.
- reports may be delivered by way of email or another active, preferably electronic, delivery system to a client 352.
- the transaction reporting service 348 is preferably in connection with a CPS transaction request broker service 350 that coordinates and manages various components of the CPS 300.
- the broker service 350 may be used to handle requests from the transaction reporting service 348, coordinate and/or manage operation of the media analysis system 326, handle requests of the transaction recording service 344, coordinate operations and data flows associated with the media storage service 340, and finally handle requests by and from the client 352.
- the client 352 preferably includes a web application interface providing access to intellectual property owners, reporting subscribers, and/or the community at large. Reference has been made in the foregoing discussions to identifying the presence of a copyrighted work in a digital signal by way of content-based finge ⁇ rints. Such a methodology (as was described, for example, in connection with FIG. 1) provides but one way of performing content identification. While the method described in connection with FIG.
- FIG. 6 illustrates one embodiment of a hierarchical identity assessment method 400 that may be used in a CPS 100, 200, 300.
- a guiding principle of this method is to start with less processor-intensive steps to assess whether the monitored transmission contains a registered copyrighted work, and then to progress to more processor-intensive steps only if early steps do not indicate a match.
- FIG. 6 is embedded in a software routing that may be operated on a computer processor, such as is contained in the network appliance 204 illustrated in FIG. 4.
- the method illustrated in FIG. 6 assumes that content type, file name, file size, IP addressing, any metadata, and/or watermarks may be discerned or extracted from a digital sample.
- actions such as content blocking or content transmission reporting may be performed based on other aspects or attributes of the data stream. For example, an action may be taken based on the source IP address.
- Content blocking for example, may be performed based on protocol (e.g., Napster, Gnutella, etc.).
- content transmissions may be acted on based on the Internet Service Provider such as AOL ® , used by the sender or the intended recipient of the content.
- the first step 402 is to compare the file name of the sample to file names of registered copyrighted works contained in a database (such as the database 244 illustrated in FIG. 4). If the file name of the digital sample matches a name in the database, then a checking comparison step 404 is preferably performed to compare the file size for the digital sample to the expected file size of the registered copyrighted work bearing that name in the database. If both the file name and file size appear to match, then the likelihood that the digital sample contains a registered copyrighted work considered is high, and a file match may be established according to block 422. Comparison of file names and file sizes is generally straightforward and does not consume substantial processing resources. Alternatively, the determination as to whether a match exists may be based only on the filename or the file size.
- a second assessment criterion involving a history of unauthorized transactions from a particular source address is preferably applied, according to step 406.
- information recording various aspects of transactions in copyrighted data may be maintained in a database, such as the database 244 illustrated in FIG. 4. Representative aspects that may be recorded include the source and recipient IP addresses, the type and identity of copyrighted files, and the number and frequency of transactions or attempted transactions. If a particular source IP address generates a history of unauthorized transactions, especially involving files of a certain type, then the likelihood is elevated that a data stream emanating from that source IP address contains unauthorized copyrighted material.
- steps 406 and 408 examine whether a source IP address has a history of unauthorized transactions, and, if so, whether the file type and/or file size is consistent with past unauthorized transactions. If both questions are answered in the affirmative, then a file match may be established according to block 422. Querying a database for suspect source IP addresses and file types and/or sizes implicated in past unauthorized transactions is generally less processing- intensive than generating and comparing content-based finge ⁇ rints.
- step 410-416 further assessment criteria using any present metadata or watermarks are preferably applied, according to steps 410-416. If metadata is present in the file according to step 410, and the metadata identifies a registered copyrighted work according to step 412, then a file match is preferably established according to block 422. If either of these questions is answered in the negative, then preferably the following inquiry is whether the file contains a watermark according to step 414. If a watermark is present, and the watermark identifies a registered copyrighted work according to step 416, then a file match may be established according to block 422.
- Identification by way of metadata or a watermark may be performed by reference to archived data, such as may be stored in the database 244 illustrated in FIG. 4. Inquiring into the presence of metadata or watermark information and querying archived data to compare these identifiers is preferably performed in advance of finge ⁇ rinting to achieve desirable speed characteristics if processing resources are limited.
- a content-based finge ⁇ rint for a digital sample may be generated according to block 418. But even if one or more of the foregoing assessment criteria indicates a match with a registered copyrighted work, it may be desirable to check at least a portion of the matched results with a finge ⁇ rint identification method for validation pu ⁇ oses. That is, each of the foregoing assessment criteria provides only a probability that the unknown content contains a registered copyrighted work. Using finge ⁇ rinting techniques to check at least a portion of results matched according to other assessment methods may preferably provide feedback as to the effectiveness of a particular hierarchical identity assessment method.
- the finge ⁇ rint may be compared to an archive of identifiers for registered copyrighted works according to step 420.
- the archived identifiers may be stored in a database, such as the database 244 illustrated in FIG. 4. If finge ⁇ rint comparison identifies a registered copyrighted work according to step 420, then a file match may be established according to block 422.
- finge ⁇ rint comparison identifies no match according to block 424, then it may be concluded that the digital sample does not correspond to a registered copyrighted work.
- a copyright owner may recognize the benefit of registering the work and/or choose one or more particular business rules to provide an appropriate and desirable level of copyright protection.
- one task for the CPS provider is to gather and/or enter potentially useful data corresponding to that work into a database or archive, such as the archive 338 illustrated in FIG. 5.
- This task may be generally described as data enrichment.
- data enrichment is automated to the extent possible, but manual intervention may be desirable, such as to augment information available to an automated data enrichment service and/or to check and control the quality of automatically entered data.
- Numerous data fields may be useful in operating a CPS or providing copyright protection services in accordance with the present invention, such as, for example, file name, file size, a content-based finge ⁇ rint, commerce artist name, label name, album name, producer name, release date, and others.
- the first step 500 is to obtain the copyrighted work to be registered in digital form.
- the CPS provider may obtain digital files, for example, by way of transmission over a network such as the Internet, or by way of a portable digital storage medium such as a CD or DVD. If necessary, the CPS provider may receive an analog copy or a hard copy of a copyrighted work, such as a cassette tape or a photograph, and convert it to digital form.
- the next step 502 to generate a finge ⁇ rint, preferably for each discrete digital work. If an entire music album were provided to the CPS provider, then a separate finge ⁇ rint would preferably be generated for each song on that album to facilitate identification of individual songs by the CPS.
- a CPS may use Metadata.
- Inquiry into the presence of owner-supplied metadata may be performed according to step 504.
- Owner-supplied metadata which may be found, for example, in a format such as an .id3 or .md5 file associated with the digital work, may be extracted according to block 506.
- Types of metadata that might be extracted include, for example, artist name, title of the song / movie / work, album name, company / owner name, producer name, release date, and similar information. If no owner-supplied metadata is present, then online metadata archives is preferably queried for the specified copyrighted work according to step 508.
- Examples of online metadata archives that may be queried for such information include "FreeDB” and "CDDB.” If the online archives include metadata for the specified copyrighted work according to block 510, then the metadata is preferably extracted according to step 506 for use in the CPS. If no metadata is available for the work in such a database, then desired information may be added manually according to step 512. Following addition of metadata, any art associated with the work may be added to a CPS database, such as the archive 338 illustrated in FIG. 5. Such associated art may include, for example, an album cover for an audio work, a thumbnail of an image work, or movie art.
- a query is performed to determine which commercial site or sites, if any, offer the particular copyrighted work for sale according to step 516.
- the commercial site(s) are online websites, and more preferably websites affiliated with the CPS provider such as by contractual affiliation.
- Address information preferably in the form of a URL, for commercial websites having the work for sale is then associated with the copyrighted work in a CPS database.
- a final step may be the addition of a "deep" link (such as a URL) or product code for purchasing the specified registered copyrighted work from the commercial site according to step 518.
- the foregoing information may be useful in facilitating commercial transactions in registered copyrighted works.
- FIG. 8 illustrates an implementation of a CPS 600 utilizing several network appliances 602, 604, 606, 608 distributed along network segments for several watched networks 612, 614, 616, 618.
- Each watched network 612, 614, 616, 618 connects to a distributed electronic network such as the Internet 620, and each network appliance 602,
- 604, 606, 608 has access to digital data transmitted between each watched network 612, 614, 616, 618, and the Internet 620.
- a network appliance utilized with a CPS generally may operate either in-stream or mirrored along a network segment
- the configuration illustrated in FIG. 8 illustrates network appliances 602, 604, 606, 608 configured to receive mirrored data transmitted between watched networks 612, 614, 616, 618 and the Internet 620.
- Each network appliance is capable of communicating with a CPS network data center 630, which preferably includes such devices as a transaction request broker service 632, a transaction recording and management service 634, a transaction database 636, a raw media storage service 644, and a raw media storage archive 646.
- the transaction request broker 632 preferably routes and/or manages transactions between various components of the CPS, including various network appliances 602, 604, 606, 608.
- the transaction database 636 stores information relating to transactions in digital works, with particular emphasis on unauthorized transactions in registered copyrighted works.
- the transaction recording and management service 634 provides an interface with the transaction database 636.
- the raw media storage archive 646 may be used to store information including digital works, such as those supplied by copyright owners or duplicated from traffic communicated between a watched network 612, 614, 616, 618 and the Internet 620.
- the raw media storage archive 646 may further store finge ⁇ rints generated from copyrighted works.
- the raw media storage service 644 provides an interface with the raw media storage archive 646.
- Each network appliance 602, 614, 606, 608 preferably includes a memory for receiving and storing content-based identifiers, including finge ⁇ rints.
- each network appliance 602, 614, 606, 608 includes a processor to provide content type identification and content assessment capabilities.
- Each network appliance 602, 614, 606, 608 may be periodically updated with new identifiers from the network data center 630, such as identifiers for newly registered copyrighted works.
- the distributed architecture of a CPS according to FIG. 8 facilitates rapid monitoring of high-bandwidth watched networks 612, 614, 616, 618.
- Each network appliance 602, 604, 606, 608 may communicate with the network data center 630 by way of a public network such as the Internet, a virtual private network, a dedicated private network, or any combination of such connection types to promote system reliability in case one becomes inoperable. Additionally, while FIG. 8 illustrates only a single network appliance at each watched network 612, 614, 616, 618, redundant network appliances may be provided at each location to enhance overall system reliability.
- FIG. 9 illustrates a business method 700 including steps that may be employed according to one or more CPS embodiments.
- the business method 700 illustrated in FIG. 9 is intended to present merely one example of novel business steps; non-obvious variants omitting certain steps, addition of further steps, and applying disclosed steps in a modified sequence are still contemplated to remain within the scope of the invention.
- the first step 702 provided in FIG. 9 is providing and/or maintaining a database (or "registry") of information identifying registered copyrighted works.
- a database or "registry” of information identifying registered copyrighted works.
- a database of identifiers should be designed to grow over time.
- a data enrichment method such as that as discussed in conjunction with FIG. 7, is preferably applied to build and maintain the database according to this step 702.
- a revenue- generating step 704 includes the solicitation of payment in exchange for registering copyrighted works and/or providing copyright infringement protection services. This payment may be solicited by the provider from, for example, copyright owners individually, associations of copyright owners, network providers or operators, or any combination thereof.
- Providing copyright protection services according to the present invention generally includes monitoring a network or network segment for transmission of digital signals, as in step 706. Identification of files embodying file types of interest transmitted over the monitored network or network segment may be performed according to step 708. If a file type of interest is found, then one or many of various features may be extracted or generated from the file to facilitate content identification according to step 710.
- a comparison step 712 is advantageously performed to determine whether the extracted or generated features match one or more identifiers contained in the database maintained according to step 702. If a match is made, then such a match indicates that the file from which the features were obtained contains a registered copyrighted work, as noted in step 714.
- a typical follow-up step 716 is to check whether transmission or receipt of the registered copyrighted work has been authorized by the copyright owner.
- the CPS provider maintains a database that identifies authorized senders and/or receivers of digital copyrighted works, and that further includes preferences of the copyright owner for handling transactions in a copyrighted work.
- Determining whether a particular address is authorized to transmit and/or receive a registered copyrighted work may be performed by querying the database for such information.
- handling preferences such preferences may be used by the CPS provider to apply business rules to transactions or attempted transactions in registered copyrighted works. For example, some copyright owners such as software developers may distribute copyrighted material according to license agreements that expressly forbid digital transmission of the source code. Such owners might prefer to block all attempted digital transmission of these materials, and communicate this preference to the CPS provider.
- step 716 If upon application of step 716 it is determined that the transmission is not authorized, then information identifying the transaction may be recorded (such as in the transaction database illustrated in FIG. 8) according to step 718. Recorded information for an unauthorized transaction may include identifiers such as included in FIG. 2.
- transaction reports such as the report illustrated in FIG. 2, may be generated from some or all of the recorded information. As information contained in transaction reports may be valuable to copyright owners and others, for pu ⁇ oses including but not limited to marketing and seeking licensing revenue, such reports may be sold by the CPS provider in a further revenue generating step 724.
- the ability of generating transaction reports and/or blocking content provides additional revenue generation potential by affording businesses and organizations the opportunity to install the CPS on their networks or computers.
- a per-seat license may be offered to an organization or business to limit and/or monitor the transmission of content by its members and thereby limit the organization's or business' exposure to liability for unauthorized use of content. Similar to the way virus protection software may be installed on individual computers in a local area network of an organization, CPS client software may be installed to afford an organization or business copyright infringement protection.
- transmission of the registered copyrighted work is authorized, then preferably lesser information regarding the transaction may be recorded, such as by incrementing a counter of transactions in the particular registered work, according to step 720. Preferably less information is recorded in the case of an authorized, lawful transaction to respect the privacy rights of the sender and receiver.
- business rules may be applied to the transaction according to step 726.
- the CPS provider preferably solicits preferences of copyright owners for handling unauthorized transactions in registered copyrighted works, and the CPS provider maintains a database recording those preferences.
- the preferences are preferably established at the time a work is registered with the CPS, so that business rules to be applied to a particular copyrighted work may be defined before detection by the CPS provider of an unauthorized transaction in a registered copyrighted work.
- business rules that might be applied include but are not limited to blocking unauthorized transmissions, sending a message to the source address and/or recipient address, referring the source address and/or recipient address to a commercial website, and/or recording transactions in copyrighted works carried by the monitored signal.
- a further revenue- generating step 728 may follow from the application of business rules, as the CPS provider may solicit payment for referrals to commercial sites, such as websites, where copyrighted works are available for sale and/or commissions for sales resulting from such referrals.
- the CPS provider obtains an affiliation, such as by contract, with commercial sites to provide for referral and/or commission payments.
- the exemplary business method 700 provided in FIG. 9 provides multiple potential revenue streams to the CPS provider.
- a finge ⁇ rint may be generated from the unregistered work according to step 732. Thereafter, the finge ⁇ rint may be stored by the CPS provider in a database or archive such as the database 646 provided in FIG. 8. Preferably, the database (such as database 646 of FIG.
- step 734 is queried to compare the newly generated finge ⁇ rint to archived finge ⁇ rints for other unregistered works according to step 734. If a match is found from this query, then a transaction counter may be incremented to reflect the number of transactions in the particular work according to step 736. If no match is found, then the finge ⁇ rint is preferably added to the database of unregistered works. Regarding the capability of providing retroactive transaction reports, such information may be useful to the copyright owner in selecting particular preferences or business rules to be applied by the CPS provider to protect a copyrighted work following its registration.
- U.S. Patent No. 5,918,223 provides a method for performing analysis and comparison of audio data files based upon the content of the data files.
- An alternative method to that disclosed in U.S. Patent No. 5,918,223 for generating statistical models of digital audio recordings, which are used for probabilistic identification of unknown digital audio streams, is referred to herein as a Stochastic Audio Matching
- SAMM SAMM is preferably embodied in a software routine that may operated on a device such as a network appliance (e.g., network appliance 104 in FIG. 1, network appliance 204 in FIG. 4, or network appliances 602-608 illustrated in FIG. 8). Discussed below are the mathematical and statistical concepts behind the SAMM system, as well as a description of one implementation of these concepts.
- a network appliance e.g., network appliance 104 in FIG. 1, network appliance 204 in FIG. 4, or network appliances 602-608 illustrated in FIG. 8.
- SAMM is a process for generating statistical models of digital audio recordings and using these models for probabilistic identification of unknown digital audio streams.
- the creation of the models and the identification of unknown audio streams are separate functional processes, but they are logically tied together within the overall goal of audio identification.
- the use of SAMM involves the generation of many models for each audio item that is to be identified, and the storage of these models in a SAMM database. Once the database has been constructed, unknown digital audio streams can be positively or negatively (no match found) identified within a known degree of accuracy using the SAMM database of audio models.
- SAMM encompasses two distinct functional processes of model generation and audio identification.
- the SAMM process is a statistical tool, and that the identification of unknown audio streams is based on the probability that features the unknown audio exhibits matches the features from a known audio sample.
- a probability over a given threshold likely indicates that the unknown audio stream matches (corresponds) to the current known sample being compared against, while a probability under the given threshold indicates that the unknown audio stream does not match the current model being compared against. Since the system is probabilistic against a threshold, there are no absolutes when using this process.
- the model generation process and the audio identification process share a common set of data that they operate upon. These data are the features of the digital audio stream.
- a single feature is a collection of the representative characteristics of the audio stream at a single point in time (currently, about twenty characteristics per feature). Many features are extracted for a given audio stream, usually one hundred per second.
- SAMM can then generate a model for storage, or use the feature set to compare against known models. The details pertaining to feature extraction, model creation and audio matching are explained fully in the Process Detail section.
- FIG. 10 provides a generalized description of the data flow within SAMM. Boxes 792, 794, 796 represent the major processes of Feature Extraction, Model Generation, and Audio Matching, as will be described herein in further detail.
- the plain text in FIG. 10 represents the input and outputs for each process.
- Raw audio input 791 is provided to the feature extraction process 792, which outputs extracted features 793 to both the model generation and audio matching processes 794, 796.
- the model generation process results in creation of a model 795, while the audio matching process results in either positive or negative identification 797.
- SAMM Inputs and Outputs 1.
- Raw digital audio 791 coming into the system is preferably first decoded and down-sampled to a pulse code modulation (PCM) stream, such as at a frequency of 16 kHz.
- PCM pulse code modulation
- a frequency of 16 kHz such as at a frequency of 16 kHz.
- .mp3 and CD quality audio streams are encoded at 44.1 kHz.
- This decompression and conversion may be performed by a readily available third party utility such as the Linux utility mpgl23.
- the PCM stream is assembled into a data array, which is the primary input into the Feature Extraction process 792. b. Parametric Input
- the statistical parameters used in feature extraction should be determined before the extraction process 792 occurs.
- the primary parameters used in the mathematical and statistical formulas used for feature extraction are summarized below with corresponding sample values for illustration pu ⁇ oses: • Sampling rate of the incoming PCM data (e.g., 16kHz).
- Filter bank count (e.g., 20) - this is the number of datum in a feature.
- Filter bank channels e.g., Filter bank count - 1
- MFCC Mel-Frequency Cepstral Coefficient
- Center frequency e.g., Filter bank count + 2.
- the output of the Feature Extraction process 792 is a collection of feature vectors, the number of which is determined by the parametric input to the process. Each vector preferably consists of Filter bank count number of floats and this vector statistically represents the digital audio stream at a particular moment in time.
- the collection of features is treated within the software as an array of arrays (two-dimensional array) of floats, and this serves as the data input to the 2. Model Generation process 794 and 3. Model Matching process 796. 2. Model Generation a. Data Input The input to the Model Generation process 794 is an array of an array of floats (collection of feature vectors 793) representing the audio to be modeled. This is the output of the 1. Feature Extraction process 792. b. Parametric Input
- the statistical parameters used in the extraction of features should be determined before execution of the Feature Extraction process 792.
- the primary parameters chosen for the mathematical and statistic formulas used in model generation are summarized below with corresponding sample values for illustration pu ⁇ oses: • Vector length (e.g., Filter bank count).
- Max frames e.g., 3000 - this corresponds to 100 frames per second for 30 seconds of audio.
- Variance threshold e.g., 0.001.
- a generated model 795 is preferably a binary file containing statistical information about the raw audio 791 from which the original feature set was generated.
- the output model 795 is preferably stored in a "SAMM" database (such as, for example, the database 338 illustrated in FIG. 5 or the database 646 illustrated in FIG. 8) for use in a model matching process 796.
- the input to the model matching process 796 is preferably an array of an array of floats (collection of feature vectors 793) representing the audio to be identified. This is the output of the 1. Feature Extraction process 792. b. Model Matching Result
- Output from the model matching process 796 is preferably a textual representation of the identification result. If the feature set from a digital audio stream did not have a match against any model in a SAMM database, a "NO_MATCH" string may be returned. If the statistical attributes of the digital audio stream compare favorably against a model in a
- the primary goal of the feature extraction process 792 is to develop a representation of the acoustic signal suitable for classification.
- a good set of features for this problem should take into account the properties of the human ear while maintaining a high rate of data compression.
- the features used here preferably capture the spectral shape of the signal over small "snap-shots" in time.
- the audio may be analyzed over small blocks of samples during which the signal is assumed to be short-time stationary (20 to 25 ms is reasonable for speech and most audio). Overlapping windowed segments of audio may be extracted at a rate of, for example, 100 snap-shots per second to produce a vectored feature stream for classification.
- Each frame of audio consisting of approximately 25 ms of PCM samples (e.g., 400 samples @ 16kHz) may be converted into a multi-dimensional, preferably 20-dimensional, vector that encodes the spectral shape and relative-energy of the signal.
- the feature vector used in the audio classifier is described in further detail below, b. Mathematics/Statistics Observation vectors are computed periodically, preferably every 10 ms, from short-time windowed segments of audio data, preferably 25 ms in length.
- a multi-dimensional, preferably 20-dimensional, observation vector is extracted consisting of multiple Mel Frequency Cepstral Coefficients (MFCC), preferably 19 in number, and one normalized log-energy term.
- MFCC Mel Frequency Cepstral Coefficients
- a block diagram of a MFCC feature extraction process 800 is illustrated in FIG. 11.
- raw digital audio is decoded and down-sampled to a PCM stream, such as at a 16 kHz frequency.
- a second step 804 short-time windowed segments are extracted from the down-sampled stream.
- a sampled frame is windowed.
- the feature extraction begins by pre-emphasizing the audio to remove glottal and lip radiation effects according to a fourth step 808.
- the pre-emphasis operation is implemented as a first order Finite Impulse Response (FIR) filter given by
- the wa ⁇ ed magnitude spectrum is next passed through a bank of triangular-shaped filters that uniformly partition the Mel frequency scale into P regions according to step 814.
- uniformity on the Mel frequency scale takes into account nonlinear sensitivity of the ear across frequency.
- wfk] represent the weight of the 7th filter to the kth discrete frequency of the sampled signal s(n) and let ⁇ S mel [k] ⁇ represent the DFT magnitude spectrum of s(n) wa ⁇ ed onto the Mel frequency scale.
- the 19 dimensional vector is augmented with a normalized log-energy component, which is calculated for each frame of data.
- the log-energy term is calculated by first taking the log of the sum of the squared data samples. Let s,(n) represent the nth sample from the tth excised frame of audio. Assuming Ns samples per frame of audio, an initial frame-based energy term is computed as follows,
- the energy outputs are normalized to range between -5.0 and +1.0 and are
- FIGS. 12a - 12b provide annotated sequence diagrams to additionally detail the program and data flow of the individual processes.
- the following sections are intended to discuss the inner workings of SAMM in the context of the concepts and mathematics at the object level.
- the implementation of SAMM is preferably performed in an object-oriented fashion, such as in the C++ programming language, thus all objects described in this section and in the following sections are C++ objects.
- a higher level calling entity 902 within the Media Analysis System initiates the process of feature extraction.
- a utility object within SAMM called the AudioAnalyzer 904, which is instantiated and managed by the calling entity, performs the actual extraction.
- the calling entity 902 is also responsible for managing the collection of raw data from which features are extracted, and managing the AudioAnalyzer' s use of this data.
- the calling entity executes various member functions on the AudioAnalyzer 904 with the ultimate goal being the extraction of features from raw audio data and the storage of this collection of features as a data member within the AudioAnalyzer object 904. Once populated with the features, the AudioAnalyzer object 904 is used as the storage and wrapper of the features as they are used in the process of model generation of audio identification.
- FIGS. 13a-13b For two segments of audio from music pieces.
- frequency is plotted along the y-axis while time is plotted along the x-axis.
- FIG. 13a we see distinct sequences of spectral patterns emerge as the song progresses from piano key strokes through a percussion hit through finally a sequence of synthesizer key strokes.
- FIG. 13b we see other patterns manifested when a singer vocalizes a word in the song.
- a piano keystroke leads into a percussion followed by synthesizer notes.
- an artist sustains vocalization while singing.
- the sequences of spectral patterns across the time-sequence of the audio represent the signature or "footprint" of the song. Modeling the spectral characteristics of each audio clip allows one to distinguish between artists and music pieces.
- the proposed algorithm considered here assumes that the sequence of features extracted from the song is statistically independent. Under this assumption, the likelihood of observing a feature vector x t at time t is not dependent on the feature vector jc extracted at time t-1 or any other time for that matter.
- the likelihood of observing sequence of T feature vectors, X - ⁇ , ,x 2 , ... , x ⁇ ⁇ given a model ⁇ for an audio segment can be expressed as,
- each song under consideration can be modeled by characterizing the statistical distribution of the feature vectors excised from an example of the song.
- the audio modeling scheme becomes less sensitive to slight alterations in the features. Such alterations can be experienced due to differences in audio codecs, time-shifts in the signal, sampling rate, etc.
- the statistical approach returns the likelihood or probability that the observed set of features were generated by a model, ⁇ .
- the goal of the search is to find the model ⁇ s with the maximum likelihood of generating the unknown feature sequence.
- the song associated with this model is assumed to best match the unknown.
- b m (x) is the multivariate Gaussian density.
- b m (x) can be expressed as,
- ⁇ m and ⁇ m represents the vector mean and covariance of the mth Gaussian density respectively. Further, the weights for the Gaussian functions follow the sum-to-one property, M
- the parameter estimation algorithm is iterative. At each iteration, a new set of model parameters are determined which increase the total likelihood of the training patterns against the current model. In general between 6-10 iterations of the parameter update equations are required before model convergence.
- Iterative Update Assuming diagonal covariance matrices, the observation probability, b m (x, ), can be expressed by,
- C m is a mixture-density dependent constant that can be pre-computed at run-time
- Eqn. 21 Further computational savings for Eqn. 21 can be obtained using partial distance elimination (PDE) and feature component reordering (FCR) as described in B. Pellom, R. Sarikaya, J. Hansen, "Fast Likelihood Computation Techniques in Nearest-Neighbor based search for Continuous Speech Recognition," submitted to IEEE Signal Processing Letters.
- PDE partial distance elimination
- FCR feature component reordering
- FCR feature component reordering
- FIG. 14 is an annotated sequence diagram describing the process of model generation within SAMM.
- a calling entity 902 initiates model creation via the use of the AudioModeler object 906.
- the inputs required for the AudioModeler object 906 are an AudioAnalyzer object 902, which contains the set of features to be modeled, and a reference to the model to be created. This reference is passed to the AudioModeler object 906, and the model is created in-situ.
- the goal of the media identification algorithm is decide whether or not the audio material under test matches one of the S songs modeled by the system. If the system decides that the audio is from one of the modeled songs in the database, the identifier must provide a classification of which song the material is from. b. Mathematics/Statistics
- the optimal processor for the binary hypothesis problem is the likelihood-ratio test,
- FIG. 15 is an annotated sequence diagram describing the process of media identification within SAMM.
- the implementation of the 3. Media Identification process is similar to 1. Feature and 2. Media Model Generation.
- a calling entity 902 initiates the identification process via the use of the AudioSearch object 908.
- the inputs required for the AudioSearch object 902 are an AudioAnalyzer object 904, which contains the set of features to be searched, and a reference to the in-memory database used to store all the known models against which SAMM is comparing the unknown audio input.
Abstract
Description
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US20170169235A1 (en) | 2017-06-15 |
EP1490767B1 (en) | 2014-06-11 |
US20140115716A1 (en) | 2014-04-24 |
EP1490767A4 (en) | 2006-06-14 |
US8775317B2 (en) | 2014-07-08 |
US20090077673A1 (en) | 2009-03-19 |
US20080141379A1 (en) | 2008-06-12 |
US7797249B2 (en) | 2010-09-14 |
US20080154730A1 (en) | 2008-06-26 |
US7711652B2 (en) | 2010-05-04 |
US8645279B2 (en) | 2014-02-04 |
US20050154680A1 (en) | 2005-07-14 |
EP1490767A1 (en) | 2004-12-29 |
US20050154678A1 (en) | 2005-07-14 |
US20030037010A1 (en) | 2003-02-20 |
US7565327B2 (en) | 2009-07-21 |
US20130276138A1 (en) | 2013-10-17 |
US8484691B2 (en) | 2013-07-09 |
US7707088B2 (en) | 2010-04-27 |
US20090328236A1 (en) | 2009-12-31 |
US20050154681A1 (en) | 2005-07-14 |
US20080155116A1 (en) | 2008-06-26 |
US9589141B2 (en) | 2017-03-07 |
US7363278B2 (en) | 2008-04-22 |
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