Accurate pitch measurement and tracking system and method

Details Accurate pitch measurement and tracking system and method Accurate pitch measurement and tracking system and method

1992-01-27

1994-10-04

Knepper, David D.

395 225, G10L 902, G10L 914, G10L 908

Patent

active

053533720

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.

REFERENCES:
patent: 3740476 (1973-06-01), Atal
patent: 3947638 (1976-03-01), Blankinship
patent: 4004096 (1977-01-01), Bauer et al.
patent: 4852169 (1989-07-01), Veeneman et al.
patent: 4879748 (1989-11-01), Picone et al.
patent: 4989250 (1991-01-01), Fujimoto
patent: 5093863 (1992-03-01), Galand et al.
patent: 5171930 (1992-12-01), Teaney

Affiliated with

Also associated with

Rating

Accurate pitch measurement and tracking system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Accurate pitch measurement and tracking system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Accurate pitch measurement and tracking system and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-588066