標題: Decimation-Whitening Filter in Spectral Band Replication
作者: Hsu, Han-Wen
Liu, Chi-Min
資訊工程學系
Department of Computer Science
關鍵字: analytic signal;bandwidth extension;high-frequency (HF) reconstruction;linear prediction;spectral band replication (SBR);whitening
公開日期: 1-Nov-2011
摘要: MPEG-4 High-Efficiency Advanced Audio Coding (HE-AAC) has adopted spectral band replication (SBR) to efficiently compress the high-frequency part of the audio. In SBR, linear prediction is applied to low-frequency subbands to suppress tonal components and smooth the associated spectra for replicating to high-frequency bands. Such a tone-suppressing process is referred to as whitening filtering. In SBR, to avoid the alias artifact incurred by spectral adjustment, a complex filterbank instead of real filterbank is adopted. For QMF subbands, this paper demonstrates that the linear prediction defined in the SBR standard results in a predictive bias. A new whitening filter, called the decimation-whitening filter, is proposed to eliminate the predictive bias and provide advantages in terms of noise-to-signal ratio measure, frequency resolution, energy leakage, and computational complexity for SBR.
URI: http://dx.doi.org/10.1109/TASL.2011.2131130
http://hdl.handle.net/11536/14686
ISSN: 1558-7916
DOI: 10.1109/TASL.2011.2131130
期刊: IEEE TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING
Volume: 19
Issue: 8
起始頁: 2304
結束頁: 2313
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