| 摘要 |
A reference heart beat is recirculated for comparison with an actual heart beat. First and second voltages are respectively produced with magnitudes representing the rates of recirculation of the reference heart beat and the actual heart beat. A voltage controlled oscillator produces a signal having a variable frequency dependent upon the differences in the first and second voltages. This signal is used to synchronize the rate of the reference heart beat with the rate of the actual heart beat.
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