Data extraction circuit

The invention discloses a data extraction circuit, and the circuit comprises a first filtering module which is used for receiving a C interface signal, filtering a C6 signal in the C interface signal, and transmitting a C1 signal to a blocking module; the direct current blocking module is used for isolating a direct current signal in the received C1 signal to obtain a C1 alternating current signal and transmitting the C1 alternating current signal to the reference voltage module; the reference voltage module is used for adjusting the C1 alternating current signal according to a reference input value of the power supply voltage device to obtain a C1 adjusting signal, and sending the C1 adjusting signal to the second filtering module; and the second filtering module is used for receiving the C1 adjustment signal and filtering out a high-frequency-band signal in the C1 adjustment signal to obtain an extracted data signal. Noise signals are effectively filtered out through the first filtering module, high-frequen