Minimization of Quantization Noise Amplification in Biorthogonal Subband Coders.

Quantization noise amplification (QNA) restricts the coding gain (CG) in biorthogonal subband coders. Here, a coloring filter is Introduced to color the quantization noise. The optimal coloring filter eliminating/minimizing QNA, with or without order re- striction, is found for a given finite-impulse response filter bank (FB). An efficient implementation of the coloring filter is proposed. With the coloring filter, the optimal biorthogonal ideal YB becomes the full whitening coder achieving maximum possible CG. Results verify, the CG improvement due to coloring for existing FEs. [ABSTRACT FROM AUTHOR]