Pulse detection apparatus and pulse detection method
First Claim
1. A pulse detection apparatus, comprising:
- a magnetic-field application unit to be arranged near a human body to apply a predetermined magnetic field to the human body;
a frequency variable oscillator configured to oscillate at a predetermined oscillation frequency, the predetermined oscillation frequency being a frequency within a range assumed as a resonance frequency of a molecule of a predetermined constituent constituting the blood flowing through the human body;
an antenna arranged near the human body and configured to transmit a signal oscillated by the frequency variable oscillator, as a radio wave, and receive a radio wave reflected by the human body and then returned to the antenna;
a signal separator configured to separate a transmission signal from a reception signal, the transmission signal being transmitted from the antenna, the reception signal being received by the antenna;
a phase comparator configured to compare the phase of the transmission signal with the phase of the reception signal and output a phase difference signal;
an amplitude detector configured to detect the amplitude of the reception signal and output an amplitude signal related to a pulse of the human body;
an oscillation frequency controller configured to control the oscillation frequency of the frequency variable oscillator based on the phase difference signal and the amplitude signal; and
a pulse detector configured to calculate the pulse of the human body using a change of the amplitude signal in an amplitude direction.
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Accused Products
Abstract
Provided is a pulse detection apparatus and a pulse detection method less susceptible to movement of a subject and less susceptible to noise. An oscillation frequency controller is configured to cause a frequency variable oscillator to oscillate at a predetermined oscillation frequency, which is a frequency within a range assumed as a resonance frequency of a molecule of a predetermined constituent constituting the blood flowing through a human body. The oscillation frequency controller also controls an oscillation frequency based on a phase difference signal and an amplitude signal, wherein the phase difference signal indicates the phase difference between a transmission signal transmitted from an antenna to the human body and a reception signal received by the antenna, and the amplitude signal indicates the magnitude of the amplitude of the received signal. A pulse detector detects the change of the amplitude signal in an amplitude direction as a pulse signal.
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Citations
7 Claims
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1. A pulse detection apparatus, comprising:
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a magnetic-field application unit to be arranged near a human body to apply a predetermined magnetic field to the human body; a frequency variable oscillator configured to oscillate at a predetermined oscillation frequency, the predetermined oscillation frequency being a frequency within a range assumed as a resonance frequency of a molecule of a predetermined constituent constituting the blood flowing through the human body; an antenna arranged near the human body and configured to transmit a signal oscillated by the frequency variable oscillator, as a radio wave, and receive a radio wave reflected by the human body and then returned to the antenna; a signal separator configured to separate a transmission signal from a reception signal, the transmission signal being transmitted from the antenna, the reception signal being received by the antenna; a phase comparator configured to compare the phase of the transmission signal with the phase of the reception signal and output a phase difference signal; an amplitude detector configured to detect the amplitude of the reception signal and output an amplitude signal related to a pulse of the human body; an oscillation frequency controller configured to control the oscillation frequency of the frequency variable oscillator based on the phase difference signal and the amplitude signal; and a pulse detector configured to calculate the pulse of the human body using a change of the amplitude signal in an amplitude direction. - View Dependent Claims (2, 3, 4)
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5. A pulse detection apparatus, comprising:
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a magnetic-field application unit to be arranged near a human body to apply a predetermined magnetic field to the human body; a frequency variable oscillator configured to oscillate at a predetermined oscillation frequency, the predetermined oscillation frequency being a frequency within a range assumed as a resonance frequency of a molecule of a predetermined constituent constituting the blood flowing through the human body; an antenna arranged near the human body and configured to transmit a signal oscillated by the frequency variable oscillator, as a radio wave, and receive a radio wave reflected by the human body and then returned to the antenna; a signal separator configured to separate a transmission signal from a reception signal, the transmission signal being transmitted from the antenna, the reception signal being received by the antenna; a phase comparator configured to compare the phase of the transmission signal with the phase of the reception signal and output a phase difference signal; a first amplitude detector configured to detect the amplitude of the transmission signal and output a first amplitude signal related to a pulse of the human body; a second amplitude detector configured to detect the amplitude of the reception signal and output a second amplitude signal related to the pulse of the human body; a transfer function calculator configured to use the first amplitude signal and the second amplitude signal to calculate a transfer function of the antenna; an oscillation frequency controller configured to control the oscillation frequency of the frequency variable oscillator based on the phase difference signal and the amplitude signal; and a pulse detector configured to calculate the pulse of the human body using a change of the transfer function calculated by the transfer function calculator in an amplitude direction. - View Dependent Claims (6)
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7. A pulse detection method, comprising:
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applying, using a magnetic-field application unit, a predetermined magnetic field to a human body; causing a frequency variable oscillator to oscillate at a predetermined frequency, the predetermined oscillation frequency being a frequency within a range assumed as a resonance frequency of a molecule of a predetermined constituent constituting the blood flowing through the human body; transmitting a signal oscillated by the frequency variable oscillator, as a radio wave, from an antenna arranged near the human body, and receiving a radio wave reflected by the human body and then returned to the antenna; separating, using a signal separator, a transmission signal from a reception signal, the transmission signal being transmitted from the antenna, the reception signal being received by the antenna; comparing, using a phase comparator, the phase of the transmission signal with the phase of the reception signal and outputting a phase difference signal; detecting, using an amplitude detector, the amplitude of the reception signal and outputting an amplitude signal related to a pulse of the human body; controlling, using an oscillation frequency controller, the oscillation frequency of the frequency variable oscillator based on the phase difference signal and the amplitude signal; and calculate, using a pulse detector, the pulse of the human body using a change of the amplitude signal in an amplitude direction.
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Specification