PURPOSE: To evaluate deficiency appropriately even when the opening requirement is not satisfied fully, by standardizing a mutual correlation value seeking mutual correlation between a ultrasonic receiving signal and a reference ultrasonic receiving signal.
CONSTITUTION: An ultrasonic echo signal obtained by scanning over a object 3 to be inspected with a probe 1 is memorized sequentially into a full wave type memory 7 through an A/D converter 4 and a buffer memory 5. The contents of the memory 7 and a reference echo waveform data from a reference echo converter 9 are applied separately to a mutual correlation computing circuit 11 and a self-correlation computing circuit 12 to determine a mutual correlation value, which then is standardized with a standardization circuit 13. The mutual correlation value thus standardized is stored into video RAM11 as luminance modulating signal and then, applied to a CRT display 20. This enables appropriate evaluation of deficiency even when the opening requirement is not satified fully.
KUBOTA JIYUN
SASAKI SOUJI
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