Signal detection device and signal detection method
First Claim
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1. A signal detection device comprising:
- a measurer that measures an electrocardiogram signal of a subject;
an arithmetic operation unit that receives the electrocardiogram signal, performs nonlinear arithmetic operation processing on the electrocardiogram signal for amplifying a pulse-like component of the electrocardiogram signal and suppressing a component other than the pulse-like component of the electrocardiogram signals and outputs an output signal of the nonlinear arithmetic operation processing; and
a signal period detector that detects a periodic signal and a frequency of the periodic signal from the output signal of the arithmetic operation unit, wherein;
the arithmetic operation unit selects a time difference term of the nonlinear arithmetic operation processing, based on the frequency of the periodic signal, andthe arithmetic operation unit detects a cardiac cycle of the subject by performing the nonlinear arithmetic operation processing on the electrocardiogram signal with the selected time difference term;
wherein the nonlinear arithmetic operation processing is arithmetically operated based on an input variable corresponding to an input of the nonlinear arithmetic operation processing and based on an output variable corresponding to an output of the nonlinear arithmetic operation processing,when the input variable is constant at a first value, the output variable becomes a self-oscillation waveform, which is a periodic waveform,when the input variable is constant at a second value, the output variable becomes a constant value,when the input variable is a waveform mainly containing a periodic pulse-like component, the output variable becomes a resonating signal waveform, anda period of the resonating signal waveform is equal to a period of the waveform mainly containing the periodic pulse-like component.
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Abstract
A signal detection device includes a measurer, an arithmetic operation unit, and signal period detector, and detects information such as a cardiac cycle with high accuracy by causing resonance of only a signal such as a heartbeat, the signal having strong pulse characteristics. The measurer measures a signal. The arithmetic operation unit performs nonlinear arithmetic operation processing for amplifying a pulse-like component of the signal measured by the measurer and suppressing a component other than the pulse-like component of the signal measured by the measurer. The signal period detector detects a periodic signal from an output of the arithmetic operation unit.
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Citations
19 Claims
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1. A signal detection device comprising:
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a measurer that measures an electrocardiogram signal of a subject; an arithmetic operation unit that receives the electrocardiogram signal, performs nonlinear arithmetic operation processing on the electrocardiogram signal for amplifying a pulse-like component of the electrocardiogram signal and suppressing a component other than the pulse-like component of the electrocardiogram signals and outputs an output signal of the nonlinear arithmetic operation processing; and a signal period detector that detects a periodic signal and a frequency of the periodic signal from the output signal of the arithmetic operation unit, wherein; the arithmetic operation unit selects a time difference term of the nonlinear arithmetic operation processing, based on the frequency of the periodic signal, and the arithmetic operation unit detects a cardiac cycle of the subject by performing the nonlinear arithmetic operation processing on the electrocardiogram signal with the selected time difference term; wherein the nonlinear arithmetic operation processing is arithmetically operated based on an input variable corresponding to an input of the nonlinear arithmetic operation processing and based on an output variable corresponding to an output of the nonlinear arithmetic operation processing, when the input variable is constant at a first value, the output variable becomes a self-oscillation waveform, which is a periodic waveform, when the input variable is constant at a second value, the output variable becomes a constant value, when the input variable is a waveform mainly containing a periodic pulse-like component, the output variable becomes a resonating signal waveform, and a period of the resonating signal waveform is equal to a period of the waveform mainly containing the periodic pulse-like component. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A signal detection method performed by a signal detection device, the signal detection method comprising:
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measuring an electrocardiogram signal of a subject; performing nonlinear arithmetic operation processing on the electrocardiogram signal for amplifying a pulse-like component of the electrocardiogram signal and suppressing a component other than the pulse-like component of the electrocardiogram signal and outputting an output signal of the nonlinear arithmetic operation processing; detecting a periodic signal and a frequency of the periodic signal from the output signal of the nonlinear arithmetic operation processing; setting selecting a time difference term of the nonlinear arithmetic operation processing, based on the frequency of the periodic signal; and detecting a cardiac cycle of the subject by performing the nonlinear arithmetic operation processing with the selected time difference term; wherein the nonlinear arithmetic operation processing is arithmetically operated based on an input variable corresponding to an input of the nonlinear arithmetic operation processing and based on an output variable corresponding to an output of the nonlinear arithmetic operation processing, when the input variable is constant at a first value, the output variable becomes a self-oscillation waveform, which is a periodic waveform, when the input variable is constant at a second value, the output variable becomes a constant value, when the input variable is a waveform mainly containing a periodic pulse-like component, the output variable becomes a resonating signal waveform, and a period of the resonating signal waveform is equal to a period of the waveform mainly containing the periodic pulse-like component. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of detecting a cardiac cycle of a subject, the method comprising:
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obtaining an electrocardiogram signal of the subject; generating a first processed signal by performing nonlinear arithmetic operation processing on the electrocardiogram signal with an initial time difference term; detecting a first periodic signal from the first processed signal and detecting a first frequency of the first periodic signal; determining a new time difference term based on the first frequency; and detecting the cardiac cycle of the subject by performing the nonlinear arithmetic operation processing on the electrocardiogram signal with the new time difference term; wherein the nonlinear arithmetic operation processing is arithmetically operated based on an input variable corresponding to an input of the nonlinear arithmetic operation processing and based on an output variable corresponding to an output of the nonlinear arithmetic operation processing, when the input variable is constant at a first value, the output variable becomes a self-oscillation waveform, which is a periodic waveform, when the input variable is constant at a second value, the output variable becomes a constant value, when the input variable is a waveform mainly containing a periodic pulse-like component, the output variable becomes a resonating signal waveform, and a period of the resonating signal waveform is equal to a period of the waveform mainly containing the periodic pulse-like component. - View Dependent Claims (17, 18, 19)
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Specification