Biosignal detection device
First Claim
1. A biosignal detection device comprising:
- a plurality of pressure sensors that are arranged at a seat of a vehicle to sense a pressure of a body of a vehicle occupant when the vehicle occupant is present on the seat; and
a controller that detects biosignal, which is relevant to a human body activity of the vehicle occupant present on the seat, based on a measurement of at least one effective pressure sensor, which is selected from the plurality of pressure sensors in such a manner that the measurement of the at least one effective pressure sensor is less than a first predetermined pressure and is greater than a second predetermined pressure, wherein the second predetermined pressure is less than the first predetermined pressure.
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Abstract
Pressure sensors are sorted out from the other sensors based on a signal from each sensor element. Sensor outputs of the pressure sensors that have been sorted out are filtered using an FIR filter through which sensor outputs of the other sensors are eliminated. Frequency analysis is performed on the filtered sensor outputs using FFT. A reference sensor is chosen from power spectra of the filtered pressure sensors. Phase differences are calculated between a sensor output of the reference sensor and the sensor outputs of the other pressure sensors. Based on the phase differences, pressure sensors other than the reference sensor are sorted into those with large phase differences and those with small phase differences. Phases of sensor signals of those with large phase differences are reversed, and their sensor outputs are added together. For those with small phase differences, their sensor outputs are added together without reversing the phases.
71 Citations
26 Claims
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1. A biosignal detection device comprising:
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a plurality of pressure sensors that are arranged at a seat of a vehicle to sense a pressure of a body of a vehicle occupant when the vehicle occupant is present on the seat; and
a controller that detects biosignal, which is relevant to a human body activity of the vehicle occupant present on the seat, based on a measurement of at least one effective pressure sensor, which is selected from the plurality of pressure sensors in such a manner that the measurement of the at least one effective pressure sensor is less than a first predetermined pressure and is greater than a second predetermined pressure, wherein the second predetermined pressure is less than the first predetermined pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A biosignal detection device comprising:
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a plurality of pressure sensors that are arranged at a seat of a vehicle to sense a pressure of a body of a vehicle occupant when the vehicle occupant is present on the seat; and
a controller that detects biosignal, which is relevant to a human body activity of the vehicle occupant present on the seat, based on measurements of multiple effective pressure sensors, which are selected from the plurality of pressure sensors, wherein the controller estimates a position of a heart of the vehicle occupant based on the measurements of the multiple effective pressure sensors when the vehicle occupant is present on the seat. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification