CONFERENCE CIRCUIT

摘要

R. G. Sparber 3 CONFERENCE CIRCUIT A conference circuit is disclosed for use in a telephone switching system to provide communication among three or more subscriber stations. The subscriber stations are connected to a plurality of ports of the conference circuit via communication lines and a switching network. Amplification circuitry connected to the ports provides input signal amplification to assure adequate transmission quality. A sensing circuit detects signals generated by subscriber station transitions and generates timed control signals to adjust the magnitude of amplification of input signals from the subscriber stations for a predetermined period of time. Circuits which supervise the states of junctor circuits connected to the conference circuit provide for further gain control of the amplification circuitry . Power is supplied to the conference circuit from a junctor circuit associated with one of the subscriber station connections.