Speech-nonspeech detector-classifier

Details Speech-nonspeech detector-classifier Speech-nonspeech detector-classifier

1979-10-26

1981-07-28

Nosbaum, Mark E.

179 1VC, G10L 100

Patent

active

042812186

ABSTRACT:
The classification of a signal on a telephone line can be based on its short term average energy level; nonspeech (data or signalling) as high level; speech as medium level, and noise as low level. A common use for speech detectors occurs with a time assignment speech interpolation (TASI) system. A speech detector extends a trunk activity signal (TAS) for indicating whether energy or noise is detected on a trunk. Responsive to the TAS signal, a processor processes a signal on the trunk. On occasion, it may be desirable to process different energy signals according to different methodologies. For example, during overload, a TASI system may truncate bits of a speech signal and not truncate bits of a nonspeech signal. For classifying energy signals as between speech signals and nonspeech signals, the instant classifier includes an arrangement for extracting at least one feature, or property, such as the short term power of the signal to be classified. Responsive to the extracted property, an estimator provides a coarse estimate as to whether the signal to be classified is a speech signal or a nonspeech signal. Responsive to the estimate, a six-state, sequency machine provides a fine, classifying signal for classifying the energy signal.

REFERENCES:
patent: 3705417 (1972-12-01), Asmussen
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patent: 4027102 (1977-05-01), Ando et al.
patent: 4028496 (1977-06-01), La March et al.
patent: 4100370 (1978-07-01), Suzuki et al.
patent: 4137510 (1979-01-01), Iwahara
J. Adoule et al., "On Line Speech/Data Identifier," 1977 IEEE Conf. on Acoustics, Speech, Sig. Proc., May 1977, pp. 332-335.
D. Haring, "Sequential-Circuit Synthesis," MIT Press, 1966, Chapter 1.
L. Rabiner, "Evaluation of a Statistical Approach etc.," Bell Tech. J., Mar. 1977, pp. 455-482.

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