Filter for voice operated triggering circuits

Details Filter for voice operated triggering circuits Filter for voice operated triggering circuits

1978-08-04

1979-05-29

Claffy, Kathleen H.

179 1P, 179 1D, H04M 100

Patent

active

041567978

ABSTRACT:
A filter for reducing the effective keying passband of a VOX (voice operated relay) responsive to output signals comprising pulses which follow the peak frequency pattern of the audio input pulses includes a pair of retriggerable monostable multivibrators, a "D" type flip-flop circuit, and a NOR gate which produces positive output pulses used to trigger ON the voice operated transmitter only when the input signals occur within the specified passband.

REFERENCES:
patent: 3873926 (1975-03-01), Wright
patent: 3944753 (1976-03-01), Proctor et al.
patent: 3947636 (1976-03-01), Edgar

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