Sound-reinforcement type ko - dress telephone call device

摘要

PURPOSE: To prevent so-called loss of speech head by eliminating circuit components of a voice switch such as a solid-state switch, a level detector and a band pass filter. CONSTITUTION: The device is provided with a master set radio transmission circuit 5 and a master set radio reception circuit 11 sending/receiving a carrier modulated by an outgoing, incoming extension/external line voice signal and a channel acquisition/open control signal, and with a slave set radio reception circuit 28 receiving a carrier modulated by an outgoing, incoming extension/external line voice signal and a channel acquisition/open control signal and A slave set control signal transmission circuit 27 sends a control signal in response to the received channel acquisition/open control signal to secure a talking channel. The incoming extension voice signal takes precedence over other signals in the talking. When a talk switch FK1 is depressed and the incoming extension voice signal is interrupted and the outgoing extension voice signal takes precedence over the incoming extension voice signal.