Noise reduction in oversampled filter banks using predictive quantization

We introduce two methods for quantization noise reduction in oversampled fi lter banks. These methods are based on predictive quantization (noise shapi ng or linear prediction). It is demonstrated that oversampled noise shaping or linear predictive subband coders are well suited for subband coding app lications where, for technological or other reasons, low-resolution quantiz ers have to be used, In this case, oversampling combined,vith noise shaping or linear prediction improves the effective resolution of the subband code r at the expense of increased rate. Simulation results are provided to asse ss the achievable quantization noise reduction and resolution enhancement, and to investigate the rate-distortion properties of the proposed methods.