Synchronized, variable-speed playback of digitally recorded audi

Details Synchronized, variable-speed playback of digitally recorded audi Synchronized, variable-speed playback of digitally recorded audi

1994-04-28

1996-12-10

Chin, Tommy P.

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386104, H04N 591, H04N 576

Patent

active

055836526

ABSTRACT:
Method and system for providing user-controlled, continuous, synchronized variable-speed playback of a previously recorded digital audio/video presentation. The user directly controls the rate of playback and the audio and video remain synchronized. The audio is expanded or compressed using the time domain harmonic scaling method so that the pitch of the audio remains undistorted. Synchronization is maintained by allowing one clock to serve as the master time clock for the system. The clocks which can serve as the master time clock include the audio decoder clock, the video decoder clock, and the system clock. The invention is particularly useful in multimedia display systems designed to display MPEG data.

REFERENCES:
patent: 4794465 (1988-12-01), Van Luyt et al.
patent: 4994912 (1991-02-01), Lumelsky et al.
patent: 5045940 (1991-09-01), Peters et al.
patent: 5420801 (1995-05-01), Dockter et al.

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