Digital transmission system and clock reproducing device

Details Digital transmission system and clock reproducing device Digital transmission system and clock reproducing device

2007-10-31

2009-10-13

Natnael, Paulos M (Department: 2622)

Television

Synchronization

Automatic phase or frequency control

Reexamination Certificate

active

07602445

ABSTRACT:
Letting fp be the frequency of a pixel clock, fs be the audio sampling frequency, and fa be the frequency of an audio clock to be reproduced, fa=384 fs=(N/M)fp, where N and M are frequency dividing ratios between the pixel clock and the audio clock of a frequency corresponding to the audio sampling frequency. When fs=48 kHz, M=27000 and N=18432, and when fs=44.1 kHz, M=30000 and N=18816. A VCO control unit detects a change in the audio sampling frequency fs from a control voltage Vctl output from a loop filter or from the frequency fo of an output clock of an oscillating unit, and then selects one of at least two VCOs.

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patent: WO-02/078336 (2002-10-01), None

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