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ECG Signal Process Circuit
The difference amplifying circuit conducts the primary amplification of the ECG signal and
rejects the common-mode interference signal.
The low-pas filtering circuit filters the high-frequency interference signal beyond the frequency
band of the ECG signal.
The PACE signal refers to the ECG pace signal. It has significant interference to the ECG signal
detection. The PACE rejection circuit can rejects the PACE signal, which helps the ECG signal
detection.
The main amplifying/filtering circuit conducts the secondary amplification of the ECG signal,
filters the signal, and then sends the ECG signal to the A/D conversion part.
Pace Detect
This part detects the PACE signal from the ECG signal and sends it to CPU.
Temperature Detect Circuit
This circuit receives the signal from the temperature transducer, amplifies and filters it, and then
sends it to the A/D conversion part.
Carrier Generate Circuit
The RESP measurement is based on the impedance method. While a man is breathing, the action
of the breast leads to changes of the thoracic impedance, which modulates the amplitude of the
high-frequency carrier signal. Finally, the modulated signal is sent to the measurement circuit.
The purpose of this module is generating the high-frequency carrier.
RESP Signal Input Circuit
This circuit couples the RESP signal to the detecting circuit.
RESP Signal Process Circuit
The pre-amplifying circuit conducts the primary amplification of the RESP signal and filters it.
The detecting circuit detects the RESP wave that has been modulated on the actuating signal.
The level shifting circuit removes the DC component from the RESP signal.
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