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:
Nov. 17, 1998
Filed:
Dec. 22, 1995
Applicant:
Inventors:
Robert J Hankinson, Carrollton, TX (US);
Scott Curry, Coppell, TX (US);
Assignee:
Cirrus Logic, Inc., Fremont, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
348682 ; 348678 ; 348521 ;
Abstract
An analog to digital converter circuit having sync control is constructed to monitor the sync condition of the digital output. When sync is lost, for example due to a low input signal level or due to an out of phase situation, the gain of the output increased to relatively high level so as to enhance the possibility of detecting the sync condition. As soon as sync is reestablished the gain is immediately turned down to a level lower than the blanking level and then gradually increased to the blanking level. The gain levels at startup and during the sync reestablishment intervals are fixed but under selective control.