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Computing (FOLDOC) dictionary
noise shaping
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communications Spectral noise transformation in a
quantisation processes. Noise is "colourised" in the timedomain an/or frequency domain by adding parts of the
previous sample. The SNR bandwidth and SNR time integral
stay the same, so some noise decreases, some increases, but
overall noise always increases.
An example of noise shaping in the frequency domain is
quantisation of samples on a Compact Disc to reduce noise
below -98 dB. The are different algorithms with slightly
different filters, e.g. Super Bitmapping, 4D Recording.