Signal processing method and pulse wave signal processing method
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United States of America Patent
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Aug 24, 2004
Grant Date -
Jun 26, 2003
app pub date -
Dec 13, 2002
filing date -
Dec 14, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A first signal and a second signal are provided as two continuous signals having an identical fundamental frequency. A first spectrum which is either one of a frequency spectrum or a frequency power spectrum of the first signal in a predetermined time period is obtained. A second spectrum which is either one of a frequency spectrum or a frequency power spectrum of the second signal in the predetermined time period is obtained. A normalized value which corresponds a ratio of a difference between the first spectrum and the second spectrum and a sum of the first spectrum and the second spectrum at the fundamental frequency is obtained. A ratio of an amplitude of a signal component of the first signal and an amplitude of a signal component of the second signal is obtained based on the normalized value.
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