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. 16, 2004
Filed:
Aug. 22, 2000
Thomas C. Savell, Santa Cruz, CA (US);
Creative Technology Ltd., Singapore, SG;
Abstract
An asynchronous sample rate estimator and a method for generating a rate estimate to track an asynchronous input sampled signal is disclosed. The present invention achieves lock quickly and maintains an optimum input buffer configuration and enhanced signal fidelity by responding quickly and accurately to changes in the incoming frequency. An asynchronous sample rate estimator receives and determines a measured sample period of an asynchronous input signal. Furthermore, a reciprocal frequency error signal and a current rate estimate signal are used to generate a rate estimate for tracking the read pointer to the write pointer of a FIFO buffer, as well as a phase correction signal for centering the write pointer in the FIFO buffer. An asynchronous sample rate estimator might also include an error gain generator for providing an error gain and a lock detector for indicating whether the system has achieved a locked condition.