Perceptual suppression of quantization noise in low bitrate audio coding

Abstract

In this paper a generalized perceptual filter which aims to reduce the audible quantization noise in low bitrate audio coding is presented. The perceptual filter is based on a human auditory perception model whereby its derivation takes the highly nonlinear nature of the human ears into account and thus attempts to model the psychoacoustic behaviour of the ear. The results show the perceptual filter can reduce the audible quantization noise in a subband coded audio signal under a subjective analysis. The proposed filter has straightforward implementation, thus making it suitable for incorporation into future coder designs.