Perceptual Audio Coding Using a Time-Varying Linear Preand Post-Filter

摘要

Recently, a new concept for perceptual audio coding was presented, which is based on a prefilterin the encoder and a corresponding post-filter in the decoder, both controlled by a psychoacousticmodel. It enables individual selection of spectral and temporal resolutions for irrelevancyreduction and redundancy reduction. This paper addresses problems related to the efficienttransmission of the filter parameters and presents techniques for efficient temporal andspectral modeling of masked thresholds using linear time-varying filters.