Method capable of extracting a value of a spectral envelope para

Details Method capable of extracting a value of a spectral envelope para Method capable of extracting a value of a spectral envelope para

1984-10-29

1990-04-03

Clark, David L.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 702

Patent

active

049147498

ABSTRACT:
A logarithmic frequency spectrum related to an input signal is converted by the use of an inverse Fourier transform into a cepstrum. The cepstrum has a first and a second frequency component which have a first peak and a second peak spaced apart from the first peak by a preselected period on an axis of frequency, respectively. The second frequency component is processed into a peak controlled frequency component having a controlled peak coincident with the first peak. The peak controlled frequency component and the first frequency component are summed up to produce an ultimate frequency component which corresponds to the value of the envelope parameter.

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patent: 4219695 (1980-08-01), Wilkes et al.
Childers, "The Cepstrum: A Guide to Processing", Proceedings of the IEEE, vol. 65, No. 10, Oct. 1977, pp. 1428-1442.
Moll, "Short-time Spectrum and Cepstrum Techniques for Vocal-Pitch Detection", J. Acoustic. Soc. Amer., vol. 35, pp. 296-302, Feb. 1964.
Schafer et al., "System for Automatic Formant Analysis of Voiced Speech", J. Acoustical Soc. Amer., vol. 47, No. 2, pp. 634-648, 1970.
Jack et al., "Waveform Detection and Classification with Saw Cepstrum Analysis", IEEE Trans on Aerospace and Elec. Sys., vol. AES-13, No. 6, Nov. 1977, pp. 610-614.
Furui, "Cepstral Analysis Technique for Automatic Speaker Verification", IEEE Trans. ASSP, vol. ASSP-29, No. 2, Apr. 1981, pp. 254-272.

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