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. 27, 2001
Filed:
May. 20, 1998
Applicant:
Inventors:
Thomas C. Savell, Santa Cruz, CA (US);
David Rossum, Monterey, CA (US);
Assignee:
Creative Technology, Ltd., Singapore, SG;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 2/500 ;
U.S. Cl.
CPC ...
H04L 2/500 ;
Abstract
An asynchronous sample rate tracker based on a phase-locked loop quickly locks to an input sample rate, even when the input sample rate equals the resident, or internal, sample rate of an asynchronous digital sample rate converter. The phase difference between the input write data and output read data is maximized to reduce data lost due to excursions in the input sample rate. In one embodiment, a binary shift register is used to generate a read pointer step size according to the derivative of the difference between a write pointer position and a read pointer position.