| 摘要 |
PROBLEM TO BE SOLVED: To compensate the frequency dependent attenuation of ultrasonic waves in a living body in a technique for extracting data in vivo from a target position using a continuous wave. SOLUTION: A modulation processing part 20 outputs the transmission signal of the continuous wave subjected to modulation processing on the basis of a modulation signal and a receiving mixer 30 uses a reference signal adjusted in the correlation with the target position in a living body to apply demodulation processing to a receiving signal to thereby obtain the demodulation signal corresponding to the target position. In this transmission and reception processing, a receiving signal compensation part 18 performs processing for compensating the frequency dependent attenuation with respect to the receiving signal according to the depth of the target position. Further, a reference signal compensation part 28 executes processing for compensating the frequency dependent attenuation with respect to the reference signal according to the depth of the target position. By this constitution, the frequency dependent attenuation in the living body is compensated. COPYRIGHT: (C)2011,JPO&INPIT
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