Formant tracker

Details Formant tracker Formant tracker

1981-08-03

1984-01-03

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 50, G10L 100

Patent

active

044244150

ABSTRACT:
A formant tracker for receiving an analog speech signal and generating indicia representative of the formant. A pitch tracker determines the fundamental frequency of the analog speech input. The fundamental frequency is used to control a sinusoidal oscillator in the generation of a sinusoidal signal which when combined with the analog speech input generates a convolution over the chosen formant frequency. The process is repeated for each integer multiple of the fundamental frequency, thereby changing the sinusoidal oscillator. The optimal integer multiple is chosen which generates the formant identification. The optimal integer is also used to generate an appropriate bandwidth. Three formant frequency ranges are used to define human speech. The optimal integers for the other two formant identifications and the appropriate bandwidths are similarly determined. The three optimal integer values are combined with the fundamental frequency to get the three formant values and their associated bandwidths. These formant values and their bandwidths together with the fundamental frequency are communicated as output so as to identify in formant form the analog signal.

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Flanagan, "Automatic Extraction of Formant Frequencies from Continuous Speech", J. Acoust. Soc. Am., vol. 28, pp. 110-118, (Jan. 1956).
Dunn, "Methods of Measuring Vowel Formant Bandwidths", J. Acoust. Soc. Am., vol. 33, pp. 1737-1746, (Dec. 1961).
Schafer et al., "System for Automatic Formant Analysis of Voiced Speech", J. Acoust. Soc. Am., vol. 47, pp. 634-648, (Feb. 1970).
Electronics, pp. 122-125, (Feb. 10, 1981).
Lin et al., "Text-To-Speech Using LPC Allophone Stringing", IEEE Transactions on Consumer Electronics, vol. CE-27, pp. 144-152, (May 1981).
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