Thursdays the PTO publishes new pending patent applications. Both of today's Spotlight Applications concern aspects of digital fingerprinting. assigned to Gracenote, the first application discloses techniques for generating and detecting fingerprints for synchronizing audio and video. Assigned to Thomson Licensing (FR), the second application discloses techniques for frame accurate advertisement insertion.
20150003799, "Method and device for generating and detecting fingerprints for synchronizing audio and video," assigned to Gracenote.
This invention relates to a device and a method of generating a first and a second fingerprint (102,104) usable for synchronisation of at least two signals (101,103) and corresponding method and device for synchronising two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronisation time point. The generated fingerprint pair(s) are stored in a database (203) and communicated or distributed to a synchronisation device (303). During synchronisation, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronised are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronisation time point, which is used to synchronise the two signals. In this way, a simple, reliable and efficient way of synchronising at least two signals is obtained. Further, this is enabled without modifying either the first and second signal (or subsequent signals). The signals may even be distorted or changed to some extent while still enabling synchronisation.
20150007218, "Method and apparatus for frame accurate advertisement insertion," assigned to Thomson (FR).
A method and an apparatus for inserting content into a transmitted video stream without modifying the original content are suggested. The transmission of videos stream is performed by broadcasting or multicasting. The insertion of content works in real-time and does not require computing overhead compared to conventional solutions. Synchronization of the original videos stream and the transmitted video stream is required for properly inserting the content. This synchronization is performed in two steps. A first step involves a coarse synchronization and in a second step a fine synchronization is applied to the result of the coarse synchronization. The coarse synchronization is based on audio-fingerprints while the fine synchronization is based on video fingerprints. The insertion of content is unsusceptible to processing or transformation steps of the original video along the broadcast or multicast chain.