Voice detector circuit

Details Voice detector circuit Voice detector circuit

1977-06-09

1980-02-05

Gruber, Felix D.

179 1P, G10L 100

Patent

active

041873963

ABSTRACT:
A voice detector circuit including a slew-rate limited amplifier at the input thereof so as to reduce the interference with the voice detection process caused by impulse noise. The slew-rate limited amplifier is essentially transparent to audio signals, while providing severe attenuation of impulse noise components. The actual determination of the voice content of the audio signal is provided by comparing the average syllabic-rate content of the impulse noise limited, audio signal with the peak noise content thereof. Additionally, a logarithmic amplifier is included for the purpose of optimizing the separation of the syllabic-rate envelope from the audio signal.

REFERENCES:
patent: 3325738 (1967-06-01), Busby et al.
patent: 3350650 (1967-10-01), Kemper
patent: 3397401 (1968-08-01), Winterbottom
patent: 3700812 (1972-10-01), Springett
patent: 3873926 (1975-03-01), Wright
patent: 3947636 (1976-03-01), Edgar
patent: 3970786 (1976-07-01), Randmere
patent: 4035729 (1977-07-01), Perry
patent: 4044309 (1977-08-01), Smith
Electronic Design, Sep. 13, 1976, pp. 110-112, M. J. Wright, "Use Slew-Rate Filtering".
Radio Amateur Handbook, Apr. 1976, pp. 236, 237.

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