Abstract: A multimedia system including an audio/video decoder/decompresser for decoding/decompressing a compressed encoded audio/video data stream to generate video images for display and audio signals for audible reproduction. The multimedia system includes an integrated system and video decoder with an audio/video synchronization circuit for substancially synchronizing the display of video images with audio playback. A method is described for detecting when the playback of audio and the display of video images are out of synchronization. The circuitry includes three programmable registers, a finite state machine and one full adder using an audio presentation time stamp and the video presentation time stamp. The method uses a rounded programmable bias value which is compared with the difference between the video presentation time stamp and the audio presentation time stamps.
Type:
Grant
Filed:
September 30, 1994
Date of Patent:
January 14, 1997
Assignee:
Cirrus Logic, Inc.
Inventors:
Chih-Ta Sung, Tzoyao Chan, Richard Chang, Mark A. Rosenau, Jeffrey G. Ort, Daniel T. Daum, Yuanyuan Sun