| 摘要 |
PURPOSE:To prevent a radio noise from emerging to a voice output, by providing a delaying circuit to a voice circuit and applying a gating to the delay output by the output of a squelch detecting circuit. CONSTITUTION:A received signal IN is supplied to a squelch detecting circuit 3, and the presence or absence of a signal transmitted from a portable unit is sent to a gate circuit 7. The circuit 7 is closed only when a transmitted signal exists. At the same time, the signal IN is applied to a delaying circuit 2 of a voice circuit 1 at one side and then delivered to the circuit 7 after receiving a delay equivalent to the working time of the circuit 3. Accordingly, a voice signal is delivered through the circuit 7 only when a transmitted signal exists. As a result, a radio noise can be prevented. |
