Method and apparatus for extracting a fundamental frequency base

Details Method and apparatus for extracting a fundamental frequency base Method and apparatus for extracting a fundamental frequency base

1997-08-04

2000-01-11

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704205, G10L 302

Patent

active

060146176

ABSTRACT:
A speech signal input from a microphone is distributed by a distribution amplifier. Using output signals of a filter group of cos phase having cut-off frequency moderate on low frequency side and steep on high frequency side and of similar filter group of sin phase, stability index is calculated based on magnitude of amplitude modulation and magnitude of frequency modulation of the signals, by stability index calculating portion and fundamental frequency extracting portion. Based on the result of calculation, approximate value of fundamental frequency is calculated based on an output of a channel indicating maximum stability, and based on the approximate value of fundamental frequency, instantaneous frequency extracting portion extracts precise instantaneous frequency as fundamental frequency, interpolating value of instantaneous frequency from adjacent frequency channels.

REFERENCES:
patent: 5214708 (1993-05-01), McEachern
Potamianos et al, "Speech Formant Frequency and Bandwidth Tracking Using Multiband Energy Demodulation", ICASSP '95, Acoustics, Speech and Signal Processing, May 1995.
Orr, "A Gabor sampling Theorem and Some Time-Bandwidth Implications", ICASSP '94.
Maragos, "Speech nonlinearities, modulations, and energy operators", ICASSP '91.
Qian, "Signal approximation via data-adaptive normalized Gaussian functions", ICASSP '92.
Potamianos et al., "A Comparison of the energy operator and the Hilbert transform approach to signal and speech demodulation", Signal Processing, (1994) vol. 37, pp. 95-120.

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