Loudspeaking substation circuit

Details Loudspeaking substation circuit Loudspeaking substation circuit

1980-04-07

1982-01-05

Konick, Bernard

179 1HF, H04M 160

Patent

active

043095739

ABSTRACT:
An improved loudspeaking substation circuit employing a dual-tone multi-frequency signal generator wherein output tone levels are regulated by the substation transmission circuit when operating in either a loudspeaker or handset mode. The circuit further provides for preventing acoustic feedback and self-oscillation between the loudspeaker and handset transmitter while transferring between either mode.

REFERENCES:
patent: 3662118 (1972-05-01), Phoenix et al.
patent: 3881069 (1975-04-01), Ichikawa et al.

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