PURPOSE: To prevent the interference of ultrasonic pulse signals from ultrasonic transmitters, by operating every adjacent transmitter and receiver of ultrasonic transmitters and ultrasonic receivers, which are arranged alternately, successively at prescribed intervals.
CONSTITUTION: The pulse of a reference clock 30 is divided into a prescribed frequency in a frequency divider 50, and an output is generated at every one period of this divided pulse. A one shot multivibrator 53 issues the output for a short time at the rise of said divided pulse. Ultrasonic pulses are generated from transmitters T11 and T21 by the timing between these outputs and the output of the multivibrator 53 and actions of gates 61, 63, and 64. In this case, the operation time of a set of transmitters T11 and T21 is shifted from that of a set of receivers R11 and R21 to prevent the interference of ultrasonic waves.
KAWASAKI TERUO
MORI KAZUYUKI
| JPS5390800A | 1978-08-09 | |||
| JPS5373159A | 1978-06-29 |