System and method for supressing pulse dialing feedback occurrin

Details System and method for supressing pulse dialing feedback occurrin System and method for supressing pulse dialing feedback occurrin

1996-07-19

1998-10-06

Chiang, Jack

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379418, 379375, 379392, H04M 100, H04M 300

Patent

active

058189238

ABSTRACT:
An acoustic feedback suppression system, particularly for auxiliary ringers in socket telephone systems, comprising a first terminal and a second terminal of a telephone line, an internal ringer, and an auxiliary ringer that is connected between the first and second telephone lines. The system comprises an activation circuit adapted to activate first and second switching circuits to reduce the voltage at the terminals of the auxiliary ringer, the activation circuit being controlled by an activation signal generated by a control and signaling circuit when a user dials a telephone number.

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European Search Report from European Patent Application 95830338.0, filed Jul. 28, 1995.

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