document: Perceptual audio coding using adaptive pre - and post-filters and lossless compression This paper proposes a versatile perceptual audio coding method that achieves high compression ratios and is capable of low encoding/decoding delay . It accommodates a variety of source signals -LRB- including both music and speech -RRB- with different sampling rates . It is based on separating irrelevance and redundancy reductions into independent functional units . This contrasts traditional audio coding where both are integrated within the same subband decomposition . The separation allows for the independent optimization of the irrelevance and redundancy reduction units . For both reductions , we rely on adaptive filtering and predictive coding as much as possible to minimize the delay . A psycho-acoustically controlled adaptive linear filter is used for the irrelevance reduction , and the redundancy reduction is carried out by a predictive lossless coding scheme , which is termed weighted cascaded least mean squared -LRB- WCLMS -RRB- method . Experiments are carried out on a database of moderate size which contains mono-signals of different sampling rates and varying nature -LRB- music , speech , or mixed -RRB- . They show that the proposed WCLMS lossless coder outperforms other competing lossless coders in terms of compression ratios and delay , as applied to the pre-filtered signal . Moreover , a subjective listening test of the combined pre-filter/lossless coder and a state-of-the-art perceptual audio coder -LRB- PAC -RRB- shows that the new method achieves a comparable compression ratio and audio quality with a lower delay
doc_bio_tags: B I I O O O O O O O B I O O O O O B I I O O O O O O O O O O O O O O O O O O O B I O O O B O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O B I O B I O O O O O O O O O O O O O O O O O O O B I O O O B I O O O O O B I I O O O O O B I I I I O O O O O O O O O O O O O O O O O O O O B I O O O O B O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O
extractive_keyphrases: perceptual audio coding lossless compression source signals music sampling rates redundancy reduction adaptive filtering predictive coding irrelevance reduction predictive lossless coding weighted cascaded least mean squared wclms lossless coder subjective listening test audio quality
abstractive_keyphrases: adaptive pre-filters adaptive post-filters high compression ratio low encoding/decoding delay psycho-acoustically controlled adaptive linear filter pre-filter/lossless coder