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: | 1-十一月-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 |
顯示於類別: | 期刊論文 |