Aiming at the disadvantage of low resource utilization in some of the broadcast channels, a digital information transmission system based on analog broadcast channel is proposed, and a forward error correction algorithm combining CRC and even-parity check is designed to reduce the error bit rate (BER) of the system. With STM32F405 as the core processor, and using HART modem AD5700, the modulation and demodulation of digital signals are implemented. The system realizes transceiving of digital information based on existing radio transmitting station. Experimental results show that the system features reliable data transmission, low bit error rate, strong practicability, and high popularization value, and provides an effective way for digital communication.%针对部分广播信道资源利用率低的缺点,提出了一套基于模拟广播信道的数字信息传输系统,并设计一种CRC校验和偶校验相结合的前向纠错算法,以降低系统误码率.系统以STM32F405为核心处理器,基于HART调制解调器AD5700实现数字信号的调制解调;利用现有广播发射台,完成数字信息的收发.实验表明,系统数据传输可靠,具有误码率低、实用性强等特点,推广价值高,为数字通信提供了一种有效途径.
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