How does the receiver in the remote key housing work?

The receiver in the remote control key shell: After the transmitter uses short-wave modulation to send out the identification code, it is received by the car’s short-wave antenna, and the splitter enters the short-wave high-frequency amplifier processor of the receiver’s electronic control unit for demodulation and decoded The identification code of the regulator is compared; if it is the correct code, input the control circuit and make the actuator work.