在研究DDS 算法的基础上,结合SOC 控制技术,设计了一种实现高精度和高稳定度的亚音频输出系统.该系统结构简单,可靠性高，操作简单，可广泛应用于无线电通信的各种场合．详细介绍了DDS 算法和硬件设计原理，给出了电路原理图，软件设计原理及流程图．关键词：CTCSS，DDS，频率控制字Abstract:On the basis of researching DDS algorithm, connected with the technolo gy of SOC, it designs a inferior audio frequency output system of high accuracy and high stability. The structure and the operating of this system are simple and the reliability is high. And it can widely used on kinds situation of no-l ine transmitter-receiver telecommunication. This article introduces the algorit hm of DDS and the principle of hardware design in detail and gives out the circ uit diagram、the principle of software design and the flow chart.Keyword: CTCSS;DDS; Frequency control word
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