The Grass Valley Group, Inc.

Joe L Rainbolt

Audio frame synchronization for embedded audio demultiplexers counts the number of audio samples for each video frame of a digital video signal. The pattern of audio samples per video frame for an audio frame is detected to identify an audio frame boundary, the pattern being a function of the respective video and audio standards for the digital video signal. For example in one embodiment the number of audio samples for consecutive video frames are compared, and when there is equality between consecutive video frames the audio frame boundary is detected.

Audio frame synchronization for embedded audio demultiplexers

A digital decoder for a biphase-mark encoded serial digital signal detects edges in the encoded serial digital signal by sampling with a sample clock to produce a blivet signal. The blivet signal is filtered by a one-bit digital lowpass filter to recover a decoded clock signal and to generate a transition window signal. The blivet and window signals are used to detect whether there is a transition within each bit interval defined by the decoded clock signal. A decoded serial digital signal has a logical one for each bit interval in which a transition occurs, and a logical zero otherwise.

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Colfax, CA, United States of America

Joe L Rainbolt