| 摘要 |
PROBLEM TO BE SOLVED: To provide a biological signal sensor capable of detecting a pulse of a human body of a measured person in a non-contact state in an extremely simple and inexpensive circuit structure.SOLUTION: A signal obtained by AM demodulation is a pseudo random pulse, and there is only a signal caused by a pseudo random pulse generated by a pseudo random pulse generation part, in a frequency difference signal output from a mixer. Therefore, a phase and a pattern of the signal output from the mixer do not match those of signals output from other devices, so that the signals output from the mixer are not output as significant signals, so that most of crosstalk influence can be removed.SELECTED DRAWING: Figure 2 |
