| 摘要 |
PURPOSE: To provide a power value corresponding to original frequency components by generating source heartbeat fluctuation waveforms from the heartbeat interval of an electrocardiogram, obtaining the interval difference of every other adjacent source heartbeat fluctuation waveform, generating relative heartbeat fluctuation waveforms and then estimating the frequency components. CONSTITUTION: Output signals from a heartbeat pickup are amplified in the differential input amplifier 1 of an AC amplification part 24, R waves are taken out in a band-pass filter 2 and they are amplified in the amplifier 3 of an A/D conversion part 25, sampled and held in a sample-and-hold circuit 4 under the control of a DMA controller 11, converted to digital signals in an A/D converter 5 and fetched from a buffer memory 6 through a data bus 7 to a CPU 10. The CPU 10 reads R waveform data, detects the R wave time, extracts an R wave interval, then computes the difference of the every other adjacent R wave each other, generates the relative heartbeat fluctuation waveform and estimates the frequency components. |
