Method to evaluate the pitch and voicing of the speech signal in

Details Method to evaluate the pitch and voicing of the speech signal in Method to evaluate the pitch and voicing of the speech signal in

1991-12-05

1994-05-17

Fleming, Michael R.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 49, G10L 908

Patent

active

053135539

ABSTRACT:
The disclosed method consists of: the cutting up, after sampling, of the speech signal into frames of a determined duration; the carrying out a first self-adaptive filtering of the sampled signal (Sn) obtained in each frame to limit the influence of the first formant; the carrying out a second filtering to keep only a minimum of harmonics of the fundamental frequency; and the comparing of the signal obtained with two adaptive thresholds SfMin(n) and SfMax(n), respectively positive and negative and changing as a function of time according to a predetermined relationship so as to choose only the signal portions that are respectively above or below the two thresholds. It then consists of: the computation, on a predetermined number of fundamental frequencies or pitches M possible, of the self-correlation of the signal obtained at the end of the previous processing operation from a determined sampling instant No; the choosing, as candidate pitch M or fundamental frequency values, those that are equal in number to a predetermined number n corresponding to maxima of self-correlation; and the entering of the corresponding values of the self-correlation in a table of scores updated at each new self-correlation so as to choose, as a pitch value, only the value that corresponds to a maximum score.

REFERENCES:
patent: 3603738 (1971-09-01), Focht
patent: 4015088 (1977-03-01), Dubnowski et al.
patent: 4653098 (1987-03-01), Nakata et al.
L. Rabiner, et al., "Digital Processing of Speech Signals", 1978, pp. 141-158, 433-435, & 446-450.
IEEE Journal of Solid-State Circuits, vol. SC-22, No. 3, Jun. 1987, pp. 479-487, S. S. Pope, et al., "A Single-Chip Linear-Predictive-Coding Vocoder".
IEEE, International Conference on Acoustics, Speech, and Signal Processing, vol. 1, Apr. 7-11, 1986, pp.121-124, W. Verhelst, et al., "An Adaptive Non-Uniform Sign Clipping Preprocessor (ANUSC) for Real-Time Autocorrelative Pitch Detection".
IEEE, International Conference on Acoustics, Speech, and Signal Processing, vol. 1, Mar. 26-29, 1985, pp. 403-406, S. Y. Kwon, et al., "A Robust Realtime Pitch Extraction from the ACF of LPC Residual Error Signals".
IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 5, Oct. 1976, pp. 399-418, L. R. Rabiner, et al., "A Comparative Performance Study of Several Pitch Detection Algorithms".

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