摘要
本文介绍了一种采用快速测量载波频率进行调频广播解调的方法,主要应用于调频广播信号监测设备中,同时还提供了用STM32F407来实现这种功能的关键电路和其中的设计要点。为了进一步提高解调性能并降低噪声,特别设计出一种非常简单有效的滤波电路。运用这种解调方法可以省去传统的鉴频器、A/D模数转换器以及连接在两者之间的音频放大电路。相关电路在调频广播监测设备中进行了实际测试,取得了良好的效果。
In the paper, a technical method which uses the fast measurement carrier frequency to demodulate the FM radio is introduced, which is mainly applied in the monitoring equipment of FM radio program. The function of the key circuit and the design points with STM32F407 microcontroller are introduced. A very simple and effective filter circuit is designed in order to improve the demodulation performance and reduce the noise. The traditional descriminator, the A/I） analog digital converter and the audio amplifier are needless. The circuit has been tested in the FM radio monitoring equipment, the design achieves good results.
出处
《单片机与嵌入式系统应用》
2016年第8期59-63,共5页
Microcontrollers & Embedded Systems
