Signal processing method and pulse wave signal processing method
First Claim
1. A method of processing two continuous signals having an identical fundamental frequency, comprising the steps of:
- providing a first signal and a second signal as the two continuous signals;
obtaining 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;
obtaining 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;
obtaining a first 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;
obtaining a first ratio of an amplitude of a signal component of the first signal and an amplitude of a signal component of the second signal based on the first normalized value.
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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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Citations
5 Claims
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1. A method of processing two continuous signals having an identical fundamental frequency, comprising the steps of:
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providing a first signal and a second signal as the two continuous signals;
obtaining 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;
obtaining 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;
obtaining a first 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;
obtaining a first ratio of an amplitude of a signal component of the first signal and an amplitude of a signal component of the second signal based on the first normalized value. - View Dependent Claims (2, 3, 4, 5)
the method further comprising the step of obtaining an oxygen saturation based on the first ratio. -
4. The signal processing method as set forth in claim 1, further comprising the steps of:
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obtaining a second 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 a noise fundamental frequency;
obtaining a second ratio of an amplitude of a noise component of the first signal and an amplitude of a noise component of the second signal based on the second normalized value; and
eliminating noises from at least one of the first signal and the second signal based on the first ratio and the second ratio.
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5. The signal processing method as set forth in claim 4, further comprising the step of displaying at least one of the first signal and the second signal in which the noises have been eliminated at the noise eliminating step.
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Specification