Voice operated switch

Details Voice operated switch Voice operated switch

1985-04-02

1986-11-25

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

367199, 381 46, 381 71, H04M 160

Patent

active

046250832

ABSTRACT:
A voice operated switch for use in noisy environments is described. The switch includes independent amplifiers for separately amplifying frequency band limited speech and noise signals. The independently amplified speech and noise signals are rectified, applied through time constant circuits, and are applied to a differential amplifier. Variations in the resulting signal are detected to determine the present or absence of speech, and control pulses are generated. The control pulses operate a switch device.

REFERENCES:
patent: 3588360 (1971-06-01), Knox
patent: 3751602 (1973-08-01), Breeden
patent: 3849603 (1974-11-01), Proios
patent: 4006310 (1977-02-01), Bayer

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