| 摘要 |
PURPOSE:To set automatically a voice switch circuit to the receiving state when a loundspeaker telephone set is used for a talking aiming at reception only by storing in advance a dial number for the talking aiming at the reception only to a microprocessor. CONSTITUTION:A CPU13 detects depression information of a pushbutton dial 14, a dial transmission circuit 6 is controlled by the dial depressing information and a dial signal is transmitted to a line end 7. Dial numbers for the talking aiming at the reception only are stored in advance in the CPU13 of the execution example of this invention. When a dial number is given to the CPU13 from a pushbutton dial 14, both the dial numbers are compared and when they are coincident, a voice switch circuit 12 is set to the receiving state after the transmission of the dial signal and when dissident, the voice switch circuit 12 is set to the transmission state after the transmission of dial signal. |
