Electronic common switch

Details Electronic common switch Electronic common switch

H - Electricity

04

M

379/20

H04M 1/50 (2006.01)

Patent

CA 1193775

ELECTRONIC COMMON SWITCH ABSTRACT OF THE DISCLOSURE In a telephone substation employing a dual tone multi-frequency signal generator, the common switch functions of disabling the transmitter and muting the receiver are performed by transistor devices responsive to a control signal produced by the signal generator. A bias voltage provided by the transistor device associated with the transmitter prevents dialing signals from reverse biasing the transistor device associated with the receiver and defeating receiver muting.

425629

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