Phonetics and Speech Sciences (말소리와 음성과학)

Korean Society of Speech Sciences (한국음성학회)
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Modified Generic Mode Coding Scheme for Enhanced Sound Quality of G.718 SWB

G.718 초광대역 코덱의 음질 향상을 위한 개선된 Generic Mode Coding 방법

  • 조근석 (한국과학기술원, 전기 및 전자공학과) ;
  • 정상배 (경상대학교, 전자공학과(공학연구원))
  • Received : 2012.08.03
  • Accepted : 2012.09.20
  • Published : 2012.09.30
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Abstract

This paper describes a new algorithm for encoding spectral shape and envelope in the generic mode of G.718 super-wide band (SWB). In the G.718 SWB coder, generic mode coding and sinusoidal enhancement are used for the quantization of modified discrete cosine transform (MDCT)-based parameters in the high frequency band. In the generic mode, the high frequency band is divided into sub-bands and for every sub-band the most similar match with the selected similarity criteria is searched from the coded and envelope normalized wideband content. In order to improve the quantization scheme in high frequency region of speech/audio signals, the modified generic mode by the improvement of the generic mode in G.718 SWB is proposed. In the proposed generic mode, perceptual vector quantization of spectral envelopes and the resolution increase for spectral copy are used. The performance of the proposed algorithm is evaluated in terms of objective quality. Experimental results show that the proposed algorithm increases the quality of sounds significantly.

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References

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