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使用数字信号处理(DSP)技术的FM解调器,具有工作稳定、可靠性高、经LSI化可实现小型化、不用调整等优点,所以比模拟式FM解调器具有更多的优越性。本文介绍的就是采用DSP技术的新的SIN形式FM解调器方案。该方案能做到无失真解调,具有宽范围取样频率等参量的优良特性,其电路结构比TAN式FM解调器简单。TAN式FM解调器需要两个A/D变换器,而SIN式FM解调器只用1个就行。另外,所需要ROM的容量,SIN式只是TAN式的三分之一,而且检相器所需要的逻辑电路也大幅度减少。文章首先介绍SIN式FM解调器的电路结构和工作原理,可以看到它比TAN式的电路结构大大简化。然后通过计算机模拟和其它的DSP式FM解调器进行比较,显示出该方式的优越性。
An FM demodulator using digital signal processing (DSP) technology has advantages over analog FM demodulators in that it has the advantages of stable operation, high reliability, LSI miniaturization, and no adjustment. This article describes the use of DSP technology, the new SIN form FM demodulator program. The scheme can achieve distortion-free demodulation and has the excellent characteristics of a wide range of sampling frequency and other parameters. The circuit structure is simpler than the TAN-type FM demodulator. The TAN-style FM demodulator requires two A / D converters, while the SIN-style FM demodulator uses only one. In addition, the required ROM capacity, SIN type is only one-third of the TAN type, and phase detector required logic circuit is also greatly reduced. The article first introduced the SIN type FM demodulator circuit structure and working principle, we can see that it is much simplified than the TAN-type circuit structure. And then through computer simulation and other DSP-based FM demodulator to compare, shows the superiority of this approach.