题目

英语翻译
The digital interpolation filter upsamples the output of the digital audio processing block by the required oversampling ratio before data is provided to the digital delta-sigma modulator and analog reconstruction filter stages.The filter provides a linear phase output with a group delay of 21/fS.In addition,programmable digital interpolation filtering is included to provide enhanced image filtering and reduce signal images caused by the upsampling process that are below 20 kHz.For example,upsampling an 8-kHz signal produces signal images at multiples of 8-kHz (i.e.,8 kHz,16 kHz,24 kHz,etc.).The images at 8 kHz and 16 kHz are below 20 kHz and still audible to the listener; therefore,they must be filtered heavily to maintain a good quality output.The interpolation filter is designed to maintain at least 65-dB rejection of images which are below 7.455 fS.In order to use the programmable interpolation capability,fS(ref) should be programmed to a higher rate (restricted to be in t

提问时间：2020-10-31

答案

不是很会,帮不了你,不好意思