Playback time compression and expansion method and apparatus
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United States of America Patent
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Apr 9, 2002
Grant Date -
N/A
app pub date -
Apr 29, 1999
filing date -
Apr 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The playback time of a video stream can be expanded by outputting twice frames having a low rate of video change and a low audio level, and the playback time can be compressed by dropping frames having a low rate of video change and a low audio level. The playback time can thus be increased or decreased easily and in a short time compared with methods in which the playback time is increased or decreased by re-editing. The viewer also perceives less unnatural video or audio compared with methods in which the playback time is increased or decreased by varying the playback speed because there is no slowing of image motion with an accompanying drop in audio pitch, nor is there a quickening of image motion with an accompanying rise in audio pitch.
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