000146181 001__ 146181
000146181 005__ 20180317093249.0
000146181 037__ $$aREP_WORK
000146181 245__ $$aNon-uniform QMF Decomposition for Wide-band Audio Coding based on Frequency Domain Linear Prediction
000146181 269__ $$a2007
000146181 260__ $$bIDIAP$$c2007
000146181 336__ $$aReports
000146181 520__ $$aThis paper presents a new technique for perfect reconstruction non-uniform QMF decomposition developed to increase efficiency of a generic wide-band audio coding system based on Frequency Domain Linear Prediction (FDLP). The base line FDLP codec, operating at high bit-rates (~136 kbps), exploits an uniform QMF decomposition into 64 sub-bands followed by sub-band processing based on FDLP. Here, we propose a non-uniform QMF decomposition into 32 frequency sub-bands obtained by merging 64 uniform QMF bands. The merging operation is performed in such a way that bandwidths of the resulting critically sampled sub-bands emulate the characteristics of the critical band filters in the human auditory system. Such frequency decomposition, when employed in the FDLP audio codec, results in a bit-rate reduction of 40% over the base line. We also describe the complete audio codec, which provides high-fidelity audio compression at ~66 kbps. In subjective listening tests, the FDLP codec outperforms MPEG-1 Layer 3 (MP3) and achieves similar qualities as MPEG-4 AAC+ standard.
000146181 700__ $$aMotlicek, Petr
000146181 700__ $$0243993$$aGanapathy, Sriram$$g173247
000146181 700__ $$0241097$$aHermansky, Hynek$$g154878
000146181 700__ $$aGarudadri, Harinath
000146181 8564_ $$uhttp://publications.idiap.ch/downloads/reports/2007/motlicek-idiap-rr-07-43.pdf$$zURL
000146181 8564_ $$s124507$$uhttps://infoscience.epfl.ch/record/146181/files/motlicek-idiap-rr-07-43.pdf$$zn/a
000146181 909CO $$ooai:infoscience.tind.io:146181$$preport$$pSTI
000146181 909C0 $$0252189$$pLIDIAP$$xU10381
000146181 937__ $$aLIDIAP-REPORT-2007-022
000146181 970__ $$amotlicek:rr07-43/LIDIAP
000146181 973__ $$aEPFL$$sPUBLISHED
000146181 980__ $$aREPORT