The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 2009
Filed:
Mar. 17, 2005
Daniel Gudmunson, Dripping Springs, TX (US);
John Melanson, Austin, TX (US);
Rahul Singh, Austin, TX (US);
Ahsan Chowdhury, Austin, TX (US);
Daniel Gudmunson, Dripping Springs, TX (US);
John Melanson, Austin, TX (US);
Rahul Singh, Austin, TX (US);
Ahsan Chowdhury, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A method and system for video-synchronous audio clock generation from an asynchronously sampled video signal provides a mechanism for maintaining synchronization of audio sampling in digital video-audio systems. A ratio between the sampling clock frequency and an audio reference frequency clock is computed via an all digital phase-lock loop (ADPLL) and an audio clock is generated from the ratio by another PLL or a number to clock converter. In systems where a sampling clock to source video clock ratio has been computed for recovering a video signal, the audio ratio can be computed directly from the video ratio.