This system is a wireless microphone amplification system. Specifically, it can be divided into the front voice signal processing circuit and the analog FM modulation circuit. The system mainly uses the phase-locked loop chip ADF4001 to realize analog frequency modulation with a carrier frequency between 88MHz and 108MHz. It can modulate and transmit audio signals with a frequency between 40 Hz and 15 kHz with an external 0.5m high-frequency transmitting antenna, and the communication distance can reach 30m. The RDA5820 transmitter and receiver chip is used to realize the automatic detection of channel occupancy when the microphone is turned on, and then automatically select the carrier frequency to avoid interference signals. The receiver back-stage circuit uses the LM386 audio amplifier to improve the load capacity of the demodulated audio signal, which can achieve an audio output power of 0.5W under an 8Ω load. The microcontroller part uses TI\'s high-performance MCU-TM4C1294 to control the PS2 keyboard and LCD display. The entire system uses TFT LCD for display, and the parameter settings are typed in the keyboard and displayed on the LCD in real time. The system realizes a wireless microphone amplification system with controllable carrier frequency and automatic detection of channel occupancy.
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