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Upsampling is useful for noise shaping because it gives you some space in the spectrum for you to shape or steer the noise into. Suppose your application space is audio. You need to sample at least 40 kHz (or 44.1 or 48 kHz). So suppose it was upsampled to 96 kHz, instead. In the bit-reduction operation (quantization) much or most of that quantization ...

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