Television – Synchronization – Locking of video or audio to reference timebase
Reexamination Certificate
2011-03-15
2011-03-15
Tran, Trang U (Department: 2422)
Television
Synchronization
Locking of video or audio to reference timebase
C348S500000, C348S512000
Reexamination Certificate
active
07907211
ABSTRACT:
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.
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“An Efficient Database Search Strategy for Audio Filngerprinting” Jaap Haitsma et al, 2002 IEEE, p. 178-181.
“A Guide Tour of Video Watermarkting” W. Doerr et al, Signal Processing, Image Communicaiton, 18 (2003) p. 263-282.
“Feature Extraction and a Database Strategy for Video Fingerprinting” J. Oostveen et al, Visual 2002, LNCS, 2314, pp. 117-128 2002.
Denissen Adrianus Johannes Maria
Oostveen Job Cornelis
Roberts David Keith
Ten Kate Warner Rudolph Theophile
Gracenote, Inc.
Schwegman Lundberg & Woessner, P.A.
Tran Trang U
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