四路多频信号的单片机实现

提出了一个由单片微型计算机８０９８产生四路多频信号的方案，说明了其实现的基本原理和控制形式，给出了接口电路和软件程序。其实现方法是对多频信号进行预先取样存贮，再利用８０９８微处理器的高速输出（ＨＳＯ）功能，将存贮波形以脉宽调制的方式输出，然后进行有源滤波，恢复模拟多频信号，从而用一个单片机实现了相互独立的四路多频信号发生器，经实际调试和运行证明，此方案完全可靠，并得出满意的结果。

Single chip computer 4-channel multifrequency signals

A practical realization of 4-Channel multifrequency generator using micropro-cessor 8098 is presented in this paper. The principles of realization and con-trol method are provided and the interface circuits and software programs are also given. Dual tone multifrequency signals are pre-sampled and stored in the memory. By taking advantage of the high speed output(HSO)ability of the 8098,the output of the processor is in the form of pulse width modulation(PWM).The analogne signals are recovered by using the active filters,In short,by utilizing a microprocessor,mutual-independent 4-channel muItifre-quency generator is implemented.The interface circuits and software pro-grams given here are well tested in practice.The results are satisfactory and the techniques used are feasible.