| 摘要 |
PURPOSE:To restrict the dialing of other mobile equipment and to prevent the wire-tapping thereof by controlling a transmission and a reception switch means with a control means of a stationary equipment so as to execute transmission/reception with a left or a right side signal. CONSTITUTION:A bell signal from a telephone line 1 is detected by a bell signal detection means 3 and outputted to an input terminal P of a control means 12. The control means 12 controls transmission and reception switch means 67 to make analog switches 6L, 6R conductive and to make analog switches 7L, 7R nonconductive to allow a call signal to be outputted from an output terminal P4 thereby allowing L and R channels receiving the call signal to output the call signal. When a mobile equipment receives the call signal from a stationary equipment, the signal is demodulated by stereo demodulation reception means 22, 42, amplified by amplifier means 24, 44 and speakers 25, 45 generate a call tone based on the amplified signal. When the user of the mobile equipment 1 makes a command of talking from an operation section 28, a control means 29 detects it and outputs a reply signal and the command signal is transmitted by a stereo modulation transmission means 23 as an L channel signal. |
