Method and apparatus for preserving or restoring audio to video synchronization
Television compressed audio
Audio to video timing equalizer method and apparatus
Method and apparatus for maintaining audio/ video synchronism in a television signal read-out from a digital buffer memory by a reference signal
Audio synchronization apparatus
Video and audio multiplex transmission system Patent #: 5231492
ApplicationNo. 129974 filed on 09/30/1993
US Classes:348/423.1, Arrangements for multiplexing one video signal, one or more audio signals, and a synchronizing signal348/515Audio to video
ExaminersPrimary: Groody, James J.
Assistant: Lee, Michael G.
Attorney, Agent or Firm
International ClassesH04N 007/12
AbstractA receiver (FIG. 2 ) for decoding associated compressed video and audio information components transmitted in mutually exclusive "frames" of data with respective time stamps PTSvid and PTSaud respectively, includes a controller (216) which is responsive to the respective received time stamps to provide coarse synchronization by delaying or skipping respective frames of one or the other of the components to approximately time align the two components. Fine synchronization is provided by adjusting the processing or clock frequency (215) of the audio signal processor (212) independent of the video processor (214). The control for the frequency adjustment is related to the difference between audio and video time stamps.
Field of SearchLocking of video or audio to reference timebase
Frame or field synchronizers
Audio to video
By controlling video or sync generator
Including compensation for transmission delays
Automatic phase or frequency control
Of sampling or clock
With data interpolation
Cascaded phase or frequency adjusting
Plural distinct operating modes