Television program transmission, storage and recovery with audio and video synchronization
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United States of America Patent
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Apr 23, 2013
Issued Date -
N/A
app pub date -
Sep 14, 2005
filing date -
Oct 12, 1994
priority date (Note) -
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Abstract
An apparatus and methods are described for receiving, storing, and recovering from storage one or more television program while maintaining proper audio to video synchronization or lip sync when the program is displayed. Preferably the audio and video portions are in digital form and may be compressed or uncompressed. The audio and video may be recorded on a physical storage medium such as tape, an optical or magnetic computer disk, or solid state memory or other such device providing user control functions including start, stop, record, play and search, with increased reproduction capability of such stored programs being facilitated by the present invention. Timing information is recovered from the audio and video to be displayed utilized to alter the time duration of a contiguous signal block (the alpha length) of the audio and/or video to correct for any timing errors therebetween. Correction of frequency artifacts such as pitch errors which may be created with the alteration of alpha length is also taught.
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