"单工无线呼叫系统设计与数据传输技术"

ontroller. The main station of the system consists of a single chip microcontroller, a dual-tone multi-frequency (DTMF) signal encoder, and a phase-locked loop frequency transmitter; while the substation consists of a single chip microcontroller, a high-fidelity frequency modulation receiver, and a dual-tone signal decoder. The main station and the substation communicate through the phase-locked loop frequency transmitter and the high-fidelity frequency modulation receiver. The DTMF signal encoder and decoder can modulate and demodulate the DTMF signals in the frequency modulation signal. The DTMF signal encoder and decoder enable the system to transmit data. While transmitting voice signals, the system can also transmit certain data information, making it suitable for small communication systems. 【Keywords】: single chip microcontroller, dual-tone multi-frequency (DTMF), phase-locked loop, data transmission In conclusion, the article introduces a wireless calling system with single direction voice and data transmission functions based on the AT89S51 single chip microcontroller. The system includes a main station and a substation, each equipped with specific components for communication. The DTMF signal encoder and decoder play a crucial role in enabling data transmission within the system. This system has practical applications for small communication systems due to its ability to transmit voice and data simultaneously.