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:
Oct. 04, 1994
Filed:
Jan. 27, 1992
Perry R Cook, Palo Alto, CA (US);
Julius O Smith, Palo Alto, CA (US);
The Board of Trustees of the Leland Stanford Junior University, Stanford, CA (US);
Abstract
A quasi-periodic signal is sampled at a specified rate, and then a predicted value of the signal is computed from a set of 2M+1 time lagged signal samples. The time lagged samples are centered in time at an integer multiple P of the signal's sampling period T.sub.s, where P.multidot.T.sub.s is approximately one period of the input signal. The predicted signal value is computed by multiplying each of the 2M+1 time lagged samples by a corresponding predictor coefficient c(i) and then summing the resulting products. The predicted signal value is subtracted from the actual signal value to obtain an error signal .epsilon.. During each successive sampling period, the predictor coefficients are updated by adjusting the previously computed predictor coefficients by an amount proportional to the error .epsilon. multiplied by each of the 2M+1 time lagged signal values. Using the updated coefficient values, a phase delay is computed, and then the signal's period is computed as the sum of phase delay and P.multidot.T.sub.s, which is the average integer time lag of the sampled signal values. When the phase delay is greater than one half of the sampling period T.sub.s, the value of P is increased or decreased, as necessary, to keep the time lagged signal samples approximately one period delayed from the current signal sample.