| 摘要 |
PROBLEM TO BE SOLVED: To provide a biological signal detector for detecting a biological signal by using a radio wave, a biological signal processor for removing noise from the biological signal, and a blood pressure measurement system for serially measuring blood pressure of a person to be measured by using the detector and processor.SOLUTION: Synchronous detection is performed by a second antenna 909 and a third antenna 910 individually receiving a radio wave transmitted from an oscillation source through a first antenna 907. A variation in impedance of a person to be measured, or a human body, causes an effect similar to amplitude modulation on a non-modulation radio wave, and a received radio wave's gain variation generated by the presence of the human body is cancelled by a differential amplifier.SELECTED DRAWING: Figure 9 |
