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US Patent 5594660 - Programmable audio-video synchronization method and apparatus for multimedia systems
US Patent Issued on January 14, 1997
Estimated Patent Expiration Date:
September 30, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
September 30, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA 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. The difference may included the latency delay of the audio and video display devices to more properly reflect the synchronization status between audio and video. The circuit area used by the circuitry has been minimized by selective rounding or truncation of the audio presentation time stamp and the video presentation time stamp without sacrificing the accuracy or speed of determining the synchronization between audio and video.Other References
| InventorsAssigneeApplicationNo. 316015 filed on 09/30/1994US Classes:715/500.1Synchronization of diverse mediaField of Search348/510, Locking of computer to video timebase348/512, Locking of video or audio to reference timebase348/515, Audio to video348/465, Data separation or detection375/362, Frequency or phase control using synchronizing signal375/375With frequency detector and phase detectorExaminersPrimary: Ramirez, Ellis B.Attorney, Agent or FirmUS Patent References4851909, Method and apparatus for maintaining audio/ video synchronism in a television signal read-out from a digital buffer memory by a reference signalIssued on: 07/25/1989 Inventor: Noske , et al.5347322, Video storage and synchronization Issued on: 09/13/1994 Inventor: Levine, et al.5351092, Synchronization of digital audio with digital video Issued on: 09/27/1994 Inventor: Poimboeuf, et al.5375068, Video teleconferencing for networked workstations Issued on: 12/20/1994 Inventor: Palmer, et al.5379356, Decompression processor for video applications Issued on: 01/03/1995 Inventor: Purcell, et al.5381181, Clock recovery apparatus as for a compressed video signal Issued on: 01/10/1995 Inventor: Deiss5396497, Synchronization of audio/video information Issued on: 03/07/1995 Inventor: Veltman5430485, Audio/video synchronization in a digital transmission system Issued on: 07/04/1995 Inventor: Lankford, et al.5467139Muting apparatus for a compressed audio/video signal receiver Issued on: 11/14/1995 Inventor: Lankford International ClassG06F 017/00 |
