Super-wideband bandwidth extension for speech in the 3GPP EVS codec
Venkatraman Atti, Venkatesh Krishnan, Duminda A. Dewasurendra, Venkata Chebiyyam, Shaminda Subasingha, Daniel J. Sinder, Vivek G. Rajendran, Имре Вaргa, Jon Gibbs, Lei Miao, Volodya Grancharov, Harald Pobloth · 2015
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.