BIOLOGICAL SIGNAL DETECTING DEVICE, BIOLOGICAL SIGNAL PROCESSING DEVICE, AND BLOOD PRESSURE MEASURING SYSTEM
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Mar 7, 2016
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Mar 5, 2015
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A radio wave transmitted from an oscillation source through a first antenna is received each by a second antenna and a third antenna, and a synchronous detection is performed. Variation in impedance of a subject, i.e., variation in impedance of a human body, causes an effect equivalent to performing amplitude modulation with respect to an unmodulated radio wave, and gain fluctuation of a received radio wave caused due to the existence of the human body is cancelled out by a differential amplifier.
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