Pulse wave detecting apparatus and fourier transform process...

Details Pulse wave detecting apparatus and fourier transform process... Pulse wave detecting apparatus and fourier transform process...

2007-03-27

2007-03-27

Marmor, II, Charles A (Department: 3735)

Surgery

Diagnostic testing

Cardiovascular

C600S336000

Reexamination Certificate

active

10659508

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.

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patent: 6361501 (2002-03-01), Amano et al.
patent: 6393311 (2002-05-01), Edgar et al.
patent: 63277034 (1988-11-01), None
patent: 10258039 (1998-09-01), None

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