Title :
Super-wideband bandwidth extension for speech in the 3GPP EVS codec
Author :
Atti, Venkatraman ; Krishnan, Venkatesh ; Dewasurendra, Duminda ; Chebiyyam, Venkata ; Subasingha, Shaminda ; Sinder, Daniel J. ; Rajendran, Vivek ; Varga, Imre ; Gibbs, Jon ; Lei Miao ; Grancharov, Volodya ; Pobloth, Harald
Author_Institution :
Qualcomm Technol., Inc., San Diego, CA, USA
Abstract :
This paper describes the time-domain bandwidth extension (TBE) framework employed to code wideband and super-wideband speech in the newly standardized 3GPP EVS codec. The TBE algorithm uses a nonlinear harmonic modeling technique that incorporates principles of time-domain envelope-modulated noise mixing. At 13.2 kbps, the super-wideband coding of speech uses as low as 1.55 kbps for encoding the spectral content from 6.4-14.4 kHz. Subjective evaluation results from ITU-T P.800 Mean Opinion Score (MOS) tests are provided, showing significantly improved quality compared to the other standardized SWB codecs under both clean speech and speech with background noise.
Keywords :
harmonics; nonlinear acoustics; speech coding; time-domain analysis; ITU-T P.800 Mean Opinion Score tests; TBE algorithm; background noise; nonlinear harmonic modeling; speech coding; standardized 3GPP EVS codec; super wideband bandwidth extension; time-domain bandwidth extension framework; time-domain envelope-modulated noise mixing; Bandwidth; Bit rate; Codecs; Harmonic analysis; Noise; Speech; Speech coding; 3GPP EVS codec; harmonic nonlinear extension; low bitrate bandwidth extension; super-wideband; temporal envelope modulation;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2015 IEEE International Conference on
Conference_Location :
South Brisbane, QLD
DOI :
10.1109/ICASSP.2015.7179109
