| 摘要 |
PURPOSE:To make the transmission and reception of a timing signal between acoustic devices unnecessary and to simplify the constitution by applying a target detecting gate means which has a prescribed circulating action for received pulses received at a prescribed period. CONSTITUTION:A target detecting gate means 11 is provided with a gate circuit 1, a low-pass filter 2, a comparator 3, a selector 4, memories 5 and 6, and gate generators 7 and 8. Normalized pulse signals are stored in memories 5 and 6. A prescribed target detecting gate signal is generated from gate generators 7 and 8 by these normalized pulse signals. The received pulse signal is gated and passes in the gate circuit 1 by this target detecting gate signal and is sent to a display device, a recorder, etc. through a terminal 52. |
