请教一个积分器滤波的问题

只看该作者 · 2010-9-2 09:23

请问谁知道积分器滤波的原理，在Baker的书里面提到The integrator serves as a
highpass filter to the noise.The result is noise shaping
翻译成积分器对于噪声来说是一个高通滤波器，结果是噪声平移。请问如何理解？

只看该作者 · 2010-9-2 09:37

刚才在网上搜了一下，网上的翻译是“噪声整形”

只看该作者 · 2010-9-2 09:41

对噪声是高通，对信号是低通。噪声被削掉。shaping可不可翻译成削掉？

只看该作者 · 2010-9-2 10:00

不行，我在网上搜到的解析是这样：“The density of "ones" at the modulator output is proportional to the input signal. For an increasing input the comparator generates a greater number of "ones," and vice versa for a decreasing input. By summing the error voltage, the integrator acts as a lowpass filter to the input signal and a highpass filter to the quantization noise. Thus, most of the quantization noise is pushed into higher frequencies . Oversampling has changed not the total noise power, but its distribution.”说明shaping只是起到distribution的作用，而没有削减作用。