Loudspeaking substation circuit

Details Loudspeaking substation circuit Loudspeaking substation circuit

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/08 (2006.01)

Patent

CA 1149091

TITLE AN IMPROVED LOUDSPEAKING SUBSTATION CIRCUIT ABSTRACT OF THE DISCLOSURE An improved loudspeaking substation circuit employing a dual-tone multi-frequency signal generator wherein output tone levels are regulated by the sub- station 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 trans- mitter while transferring between either mode.

372647

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