Audio clock regenerator with precisely tracking mechanism

Details Audio clock regenerator with precisely tracking mechanism Audio clock regenerator with precisely tracking mechanism

2007-06-04

2011-11-22

Yenke, Brian (Department: 2422)

Television

Synchronization

Locking of video or audio to reference timebase

C348S537000, C348S552000

Reexamination Certificate

active

08063986

ABSTRACT:
In an HDMI system, the clock regenerator proposed by the HDMI specification may suffer external noise because the input clock of a phase lock loop circuit in a sink device of the HDMI system is too slow. This slow input clock causes the phase lock loop circuit unable to adjust and reduce the jitter of an audio clock regenerated in the sink device. Therefore, one embodiment of the present invention provides a clock regenerator to extract the relationship between the regenerated audio clock and a video clock received by the sink device from other source devices. The clock regenerator may comprise a phase lock loop circuit, a recovery circuit, a crystal oscillator and a tracking circuit. The crystal oscillator generates a crystal clock. The phase lock loop circuit receives the crystal clock and regenerates an audio clock. The recovery circuit extracts the relationship between the audio clock and the received video clock. The tracking circuit tunes the frequency of the crystal clock based on the extracted relationship.

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