Filter bank design for minimum distortion in presence of subband quantization

This paper presents source coding schemes, based on both parallel and tree-structured filter banks, in which synthesis filters and quantizers are jointly optimized under bit-rate constraint. The design of reconstruction filter banks thus takes into account the amount of subband quantization noise, and minimizes the output mean square error (MSE). All other constraints on the filters, such as perfect reconstruction or maximum selectivity, are relaxed, and noticeable improvements over perfect reconstruction schemes with optimal bit-rate allocation are shown by means of rate-distortion curves, for both synthetic and audio signals