Semiautomatic lip sync recovery system

Details Semiautomatic lip sync recovery system Semiautomatic lip sync recovery system

1992-12-21

1995-02-07

Groody, James J.

Television

Synchronization

Locking of video or audio to reference timebase

348515, 348518, 348571, H04N 9475

Patent

active

053879430

ABSTRACT:
A semiautomatic lip sync recovery system for time synchronizing the audio and video channels of a television signal uses programmable delay circuits in each channel. An area of the image represented by the video channel is defined within which motion related to sound occurs. Motion vectors are generated for the defined area, and correlated with the levels of the audio channel to determine a time difference between the video and audio channels. The time difference is then used to compute delay control signals for the programmable delay circuits so that the video and audio channels are in time synchronization.

REFERENCES:
patent: Re33535 (1991-02-01), Cooper
patent: 4218705 (1980-08-01), Inabe et al.
patent: 4313135 (1982-01-01), Cooper
patent: 4618890 (1986-10-01), Kouyama et al.
patent: 4851909 (1989-07-01), Nocke et al.
patent: 5083201 (1992-01-01), Ohba
"Viewer Stress from Audio/Visual Sync Problems" by J. Carl Cooper, pp. 140-142, S.M.P.T.E. Journal, vol. 97, No. 2, Feb. 1988.

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