| 摘要 |
<p>PURPOSE:To suppress the consumption of a direct current and also to suppress simultaneously a voice input to a proper level by inserting a pad having a specific value into a station-side circuit with a direct current detected by a supply current monitoring circuit. CONSTITUTION:The supply current monitoring circuit 3 monitors the direct current during service and sends a control signal to a transmission/reception level adjusting circuit 2 according to whether the direct current is large or not. The transmission/reception level adjusting circuit 2 inserts automatically a pad having a proper value into the communication circuit of a station side according to whether the direct current supplied with the output signal of the monitoring circuit 3 is large or not. Consequently, the pad is inserted automatically into the station side, so the voice input is adjusted in level without increasing the consumption of the direct current.</p> |
