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数字滤波器所谓数字滤波器,是由数字运算获得滤波器特性的器件,低通滤波器特性如图30所示,在处理0～20kHz信号区域情况下,采样频率取44.1kHz,为了完全除去混淆现象的发生和镜像噪声,需要在20～22.05kHz之间衰减滤波特性。但是,这样急峻的特性采用模拟滤波器,将要损失通频带的振幅特性与相位特性。
Digital filter The so-called digital filter is obtained by digital computing filter characteristics of the device, the low-pass filter characteristics shown in Figure 30, in dealing with 0 ~ 20kHz signal area case, the sampling frequency to take 44.1kHz, in order to completely remove the confusion Phenomenon occurs and the mirror noise, the need to attenuate the filter characteristics between 20 ~ 22.05kHz. However, such steep features use analog filters that will lose the amplitude and phase characteristics of the pass band.