System for phase-locking a clock to a digital audio signal embed

Details System for phase-locking a clock to a digital audio signal embed System for phase-locking a clock to a digital audio signal embed

1998-02-10

2000-11-21

Powell, Mark R.

Television

Synchronization

Locking of video or audio to reference timebase

348515, 348537, 348536, 348423, 375376, 375362, 331 40, 331 41, 360 30, 360 51, H04N 512, H04N 505, H04N 712

Patent

active

061510769

ABSTRACT:
A system for phase-locking a clock to a digital audio signal embedded within a digital video signal uses an audio extractor, frequency dividers, and an adjusted bandwidth loop filter to prevent phase jitter associated with the digital audio signal preventing the functionality of the phase-lock loop or having unacceptable effects on the generated audio sample frequency signal. Extracted audio samples are divided down and input to a phase detector. The signal is then filtered using a series of loop filters, one of which has an adjusted bandwidth to reject phase jitter. A clock then outputs the generated synthesized audio sample frequency using the output from the series of loop filters, and the synthesized frequency signal is looped back through a second frequency divider to the phase detector.

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