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介绍了一种实现直接数字频率合成（ＤＤＦＳ）的数字信号处理方法，其基本思想基于脉冲响应为正弦波的二阶ＩＩＲ谐振器，采用这种方法可以产生出比常规的基于正弦查表的ＤＤＦＳ实现方法多的频率种类，而且具有频谱纯度高、硬件设计简单、小型、可靠等优点。
A digital signal processing method to realize direct digital frequency synthesis (DDFS) is introduced. The basic idea of this method is based on the second-order IIR resonator whose impulse response is a sine wave. This method can produce DDFS Frequency method to achieve more types, but also has a high spectral purity, hardware design is simple, small, reliable and so on.