Apparatus and method for synchronization of audio and video streams
AssigneeThomson Licensing
InventorsCharles Chuanming Wang, Andreas Matthais Aust, Sachin Satish Mody
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Abstract
Disclosed is a method and apparatus for reducing the audio-visual synchronization problems (e.g.—“lip sync” problems) in corresponding audio and video streams by adapting a statistical distribution of temporal errors to create a new statistical distribution of temporal errors. The new statistical distribution of temporal errors being substantially within an acceptable synchronization tolerance window which is less offensive to a viewer/listener.
Claims20
A method, comprising:
- receiving video access units and corresponding audio access units, said video and corresponding audio access units representing audio-visual information tending to exhibit an audio-visual temporal synchronization error described by a first probability distribution function (pdf);
- and
- temporally delaying one of said received audio and video access units by a delay amount, non-delayed and corresponding delayed access units representing audiovisual information tending to exhibit an audio-visual temporal synchronization error described by a second pdf, said second pdf utilizing a greater portion of a sync tolerance window than said first pdf.
A method for producing encoded video and corresponding audio streams, comprising:
- encoding temporally corresponding video and audio information to produce encoded video and audio streams comprising respective video and audio access units;
- and
- temporally delaying one of said encoded video and audio streams by a delay amount corresponding to a sync error tolerance model.
An apparatus, comprising:
- a delay element, for imparting a temporal delay to at least one of an audio signal and a corresponding video signal in response to an error tolerance model;
- and
- an encoder, for encoding the audio and video signals to produce encoded audio and video streams.
A computer readable medium having computer executable instructions for performing steps comprising:
- receiving video access units and corresponding audio access units, said video and corresponding audio access units representing audiovisual information tending to exhibit a synchronization error described by a first probability distribution function (pdf);
- and
- temporally delaying one of said received audio and video access units by a delay amount, non-delayed and corresponding delayed access units representing audiovisual information tending to exhibit a synchronization error described by a second pdf, said second pdf utilizing a greater portion of a synchronization tolerance window than said first pdf.
Dependencies are inferred from the claim text.