Once the modulator has transformed the analog samples into a low-resolution code with the frequency OSR ⋅ fs much greater than two times the highest spectral component of the input signal, a digital filter is used to attenuate the out-of-band quantization noise, and high-frequency interferences that can be aliased into the passband. The decimation of the modulator output bit stream at the Nyquist rate is achieved by a lowpass filter followed by a down-sampler with the factor D equal to the OSR. The aliasing in the decimation process is avoided by pre-filtering the signal samples to eliminate the components above the frequency fs/(2D).
The SNR is simply increased when the resolution changes from the low resolution to ...
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