Pulse wave detecting apparatus and fourier transform process apparatus
First Claim
1. A pulse wave detecting apparatus comprising:
- a signal detecting unit that detects a pulse wave and outputs pulse signals associated therewith;
a signal sampling process unit that samples the pulse signals from the signal detecting unit at a first frequency and sequentially outputs resultant signals;
an averaging process unit that sequentially averages without duplication every predetermined number of signals from the signal sampling process unit and sequentially outputs resultant signals at a second frequency which is lower than the first frequency;
a signal Fourier transform process unit that performs a Fourier transform process on the signals from the averaging process unit; and
a pulse rate calculation process unit that calculates a pulse rate based on the result of the process at the signal Fourier transform process unit.
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Abstract
A pulse wave detecting apparatus is provided which is capable of measuring a pulse rate more accurately even with a calculation unit having low calculating capability. An A-D conversion circuit samples a pulse wave detected by a pulse wave sensor at 16 Hz to perform A-D conversion of the same and sequentially outputs resultant signals to a modified moving average process circuit. The modified moving average process circuit sequentially averages every two of the signals from the A-D conversion circuit without duplication and outputs signals at 8 Hz, and an FFT circuit performs Fourier transform on signals obtained through the averaging. Another A-D conversion circuit samples kinetic noises detected by an acceleration sensor at 8 Hz to perform A-D conversion of the same and sequentially outputs resultant signals to another FFT circuit, and the FFT circuit performs Fourier transform on the input signals. A pulse rate calculation circuit obtains differences between the signals output by the FFT circuits to calculate a pulse rate. The pulse rate is displayed by a display section.
9 Citations
4 Claims
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1. A pulse wave detecting apparatus comprising:
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a signal detecting unit that detects a pulse wave and outputs pulse signals associated therewith; a signal sampling process unit that samples the pulse signals from the signal detecting unit at a first frequency and sequentially outputs resultant signals; an averaging process unit that sequentially averages without duplication every predetermined number of signals from the signal sampling process unit and sequentially outputs resultant signals at a second frequency which is lower than the first frequency; a signal Fourier transform process unit that performs a Fourier transform process on the signals from the averaging process unit; and a pulse rate calculation process unit that calculates a pulse rate based on the result of the process at the signal Fourier transform process unit. - View Dependent Claims (2, 3, 4)
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Specification