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What function does the following intermediate circuit achieve?
1, JP3 receives a small signal, and the first stage TL084 A constitutes a low-pass reverse amplifier to amplify the received signal. The magnification is 1M/ 10K.

2.C 17 can isolate DC, and the latter 1k can be regarded as a high-pass filter.

3. The second stage TL084 B constitutes a low-pass reverse amplifier, which is used to amplify the received signal. The magnification is1m/1k.

1~3 is a two-stage amplifier bandpass circuit. The center frequency is about 5khz.

4 U7A is a threshold comparison circuit. When the output of TL084 B exceeds the voltage threshold set by VR2, INT0 = 0INT0= 1 is lower than the set threshold.

5 C 19~VR4 is a diode detection circuit.

6 U6C Shaped Amplified Output.

7 U7B is a threshold comparison circuit. When the output of U6B exceeds the voltage threshold set by VR3, int1= 0; INT 1= 1 is lower than the set threshold.