Loudspeaking telephone hysteresis and ambient noise control

Details Loudspeaking telephone hysteresis and ambient noise control Loudspeaking telephone hysteresis and ambient noise control

1974-06-27

1976-06-15

Olms, Douglas W.

179 1VC, H04M 908

Patent

active

039638685

ABSTRACT:
A loudspeaking telephone system including voice switching is disclosed. The system is bistably voice controlled by inversely regulating the impedances of variolossers in the transmit and receive channels respectively. Further provision is made for switching additional impedance in parallel with each variolosser control to provide for a loud and a soft receiving mode. Hysteresis is added to the bistable control by the summation of receive and transmit signals across a plurality of unequal impedances that form part of a novel input control means. Circuitry forming the input control means also includes noise guard means useful in discriminating between ambient noise signals and syllabic speech signals. The noise guard circuit discriminates between noise signals and speech signals by producing an output whose amplitude is substantially related to ambient noise conditions while the noise guard circuit generally is not responsive to rapidly fluctuating voice signals. The output of the noise guard circuit is then summed with the transmit and receive signals across unequal impedances to prevent seizure of the bistable control by ambient noise.

REFERENCES:
patent: 3160707 (1964-12-01), Meyers
patent: 3363061 (1968-01-01), Gardner
patent: 3601530 (1974-08-01), Edson
patent: 3644674 (1972-02-01), Mitchell et al.
patent: 3660603 (1972-05-01), Anderson
patent: 3725585 (1973-04-01), Moniak et al.
Electronic Analog Computers, Ganino Korn, Ph.D., McGraw-Hill Book Company, 1956, pp. 13-26.

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