| 摘要 |
PURPOSE:To realize the remote hearing with elimination of the unnecessary hearing parts for the automatic answering telephone set which gives the reproducing hearing to the business message, by providing two devices to count the number of the mark signals at the rewinding and forward running time. CONSTITUTION:The following component units are provided: incoming circuit 1 to detect the incoming signals from the circuit and then transmit the answer message; action timer 2; relay A; answer tape 4; AMP1; switches a1 and b1 to receive and record the business message; AMP2; head H2; message tape 8; oscillator OSC to record the mark signals on different channel after end of the message; timer 3; head H3; mark signal detector 11 to count the number of the mark signals at the forward running and rewinding time; reversible counter 12; and relay RS respectively. |
