| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a signal processing device for pulse measurement that prevents false detection of a peak even if distortion arises in a bipolar waveform, which is a filter output, caused by a discrepancy of fitting between a time constant of a digital filter in the preceding stage and its input signal. <P>SOLUTION: A comparator 18 in a first peak recognition part 10 outputs [1] when a positive maximum value detected after detection of a negative minimum value is equal to or greater than the product of the negative minimum value and a predetermined factor α, and an AND circuit 19 outputs a peak detection signal. Thereby, detection of a noise signal as a peak following a large signal waveform is avoided. Whereas, a comparator 24 in a second peak recognition part 20 outputs [1] when the time required to return to a center value from the position of the positive maximum value is less than a time threshold β, and an AND circuit 25 outputs a peak detection signal. Thereby, a small normal peak which is not detectable by the first peak recognition part 10 can be detected. <P>COPYRIGHT: (C)2012,JPO&INPIT |
