| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise reduction processing circuit capable of reducing a body motion noise included in an observation signal with high accuracy.SOLUTION: The noise reduction processing circuit includes an adaptive filter 62 to which a body motion signal subjected to filter processing by a transfer function calculated by modeling the influence of body motion on blood flow is inputted as an input signal, and a subtracter 65 for outputting an error signal obtained by subtracting an output value of the adaptive filter from the observation signal.SELECTED DRAWING: Figure 7 |
