| 摘要 |
PURPOSE:To prevent howling and provide proportional relations to receiving and transmitting pulse signals by detecting the frequencies of the receiving pulse acoustic waves, outputting proportional electric signals and delaying and blocking the receiving pulse acoustic wave signal with a delay of a fixed time. CONSTITUTION:A control circuit M and a frequency variable oscillator F are added to an ordinary apparatus which receives the pulse acoustic wave dots Pi transmitted from an active sonar in a receiver R and transmits S the same as transmission pulse dots Po after various processing and amplification A. The control circuit M converts the signal, which comprise turning the input pulse acoustic wave dots Pi to pulse voltage dots Ei with the receiver R and turning to output dots Ei' with a blocking circuti B, to the voltage Em proportional to the frequencies and the oscillator F converts the same to dots Ef at a specified frequency conversion rate. These are then transmitted as transmission pulse dots Pi from the transmitter-receiver S via the gate circuit G and amplifier A. By this manner, proportional relations may be given to the frequencies between the transmitting and receiving pulses. |
