| 摘要 |
Apparatus for measuring a vagal tone has a detector that detects a QRS waveform of an ECG signal and generates a pulse signal that is integrated by an integrator. The integrator output is passed, in parallel, to a high pass filter and a low pass filter. The filter outputs are passed to respective voltage controlled oscillators (VCOs). The outputs of the VCOs are combined in a phase comparator that generates an output pulse train with the pulse period being proportional to the phase differences of the input signals. The phase comparator output signal is integrated and combined with a DC signal to remove any offset for constant heart rate. The combined signal is applied to a vagal tone gauge, which connects the output into a standard linear vagal tone scale. |
