摘要: © An ultrasonic transmitter/receiver of the type wherein an pulse beam is transmitted into and received from a subject under examination at fixed pulse-repetition frequency, signal during each transmission/reception cycle compared with previous to obtain comparison movement moving member in detected measured on basis provided means for causing reciprocally scan subject, memory storing signals ataddres- ses corresponding scanning positions beam, being responsive address data representing position ot output stored one earlier simultaneously store same current scan, adder adding said by means, whereby noise contained eliminated.
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