Television – Synchronization – Locking of video or audio to reference timebase
Patent
1995-12-05
1998-06-23
Chin, Tommy P.
Television
Synchronization
Locking of video or audio to reference timebase
3488453, H04N 9475
Patent
active
057710759
ABSTRACT:
An audio/video synchronizer for a digital TV is disclosed including: a system decoder for parsing an input data packet and outputting compressed data of audio and video signals and PTS/DTS and PCR or SCR; an audio/video decoder for decoding the compressed data output from the system decoder, outputting a DTS for the video or audio frame to be decoded, and outputting a decoding ready signal indicating that decoding of the video or audio frame is finished, and a PTS of corresponding data; a frame memory for storing the audio/video data from the audio/video decoder; a clock generator for dividing an input clock into a predetermined value to generate horizontal and vertical sync signals and a PCM clock of the audio signal; an audio/video playing portion for playing the data decoded in the audio/video decoder according to the decoding ready signal in synchronization with the vertical and horizontal sync signals from the clock generator and the audio PCM clock, and outputting the PTS of a picture played and the audio frame; and a PTS/DTS controller for comparing the PTS input from the audio/video playing portion or the DTS from the audio/video decoder with the PCR or SCR input from the system decoder, thereby controlling the audio/video decoder and audio/video playing portion according to their difference.
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Kim Yong Hoon
Rim Chai Yeol
Chin Tommy P.
Diep Nhon T.
LG Electronics Inc.
White John P.
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