Noise shaping is a state-of-the-art technique to preserve the perceived quality of audio signals when requan- tization happens. Noise shaping filters are special filters because of the non-linear characteristics in hearing. They have to be taken into account when designing these special digital audio filters. The design approaches presented in this contribution are able to include them into objectives or constraints. They minimize or limit the filter magnitude, the unweighted noise amplification and the group delay characteristics of the filter.
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