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

fYear

2015

fDate

19-24 April 2015

Firstpage

5927

Lastpage

5931

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing (ICASSP), 2015 IEEE International Conference on

Conference_Location

South Brisbane, QLD

Type

conf

DOI

10.1109/ICASSP.2015.7179109

Filename

7179109