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Quantization, in mathematics and digital signal processing, is the process of mapping input values from a large set (often a continuous set) to output values in a (countable) smaller set, often with a finite number of elements. Rounding and truncation are typical examples of quantization processes.

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How much will a low/high pass filter reintroduce quantization noise into a dithered signal?

Dithering prevents the harmonic distortion caused by quantization errors, doesn't just mask it. … Further quantization can of course cause the same quantization errors again, which is why dithering should be done every time bit depth is reduced, even if it has been done before in the pipeline. …
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