一种新型的数字多频信号接收器

A New Design of Digital Multifrequency Signal Receiver

本文介绍了一种数字多频信号接收器的新设计方案。该方案采用数字信号抽取的方法,使分离多频频率的滤波器组在较低的抽样率下工作,从而使所需的运算量大为降低。这样的滤波器组由多相网络、数字正弦变换(DST)和数字余弦变换(DCT)的连接来实现。由于DCT和DST的输出互为正交,为多频的检测提供了条件。用这种方法设计的多频信号接收器具有工作速度低和运算效率高的特点。

A new design of digital multifrequency signal receiver by using the method of decimation of digital signal is proposed in this paper. With this method, the filter bank for seperating frequencies can be operated at lower sampling rate and the volume of computations required for processing can be reduced considerably. The filter bank of this method is implemented with polyphase network in connection with DCT and DST. The outputs of DCT and DST are orthogonal to each other, thus, meet the requirement for detection. The multifrequency receiver designed with this method has the property of lower rate of processing and high calculation efficiency.