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.