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在数字化信号的处理过程中,改变数字信号的数据率是经常的事。一般有抽取和插值两种方法,而且往往是两种方法同时使用。从对信号保真的角度来看,具体采用什么样的插值方法,抽取和插值的次序是否有特别要求,这是信号处理过程中十分关键的问题。从上述两方面进行了一些探讨,认为采用平均值插入方式引起的失真较小。
It is not uncommon to change the data rate of a digital signal during the processing of the digitized signal. There are generally two methods of extraction and interpolation, and often two methods are used simultaneously. From the perspective of signal fidelity, it is a crucial issue in signal processing that the specific interpolation method, extraction and interpolation order have any special requirements. Some discussions have been made on the above two aspects, and the distortion caused by using the average value insertion method is small.