G.718 초광대역 코덱의 음질 향상을 위한 개선된 Generic Mode Coding 방법
Modified Generic Mode Coding Scheme for Enhanced Sound Quality of G.718 SWB
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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.
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.
참고문헌 (8)
- 조근석, "G.729.1 코더에서 프레임 간의 상호상관 관계를 이용한 개선된 스펙트럼 포락 코딩 방법", 말소리와 음성과학, 1(4), pp.97~103 (2009), 한국음성학회
- 김도영, "음성기반 오디오 융합코덱 기술동향", 전자통신동향분석, 24(5), pp.10~19 (2009)
- 이미숙, "4G 모바일 증감음성 서비스를 위한 코덱 기술 동향", 전자통신동향분석, 25(6), pp.29~37 (2009)
- ITU-T Rec., "Superwideband scalable extension forG.718, New G. 718 Annex B", ~ (2010)
- Wang, S., "An objectivemeasure for predicting subjective quality of speech coders", IEEE Trans. Selected Areas in Comm, 10(5), pp.819~829 (1992)
- Linde, Y., "An Algorithm forVector Quantizer Design", IEEE Transaction onCommunications, 28(1), pp.84~94 (1980)
- Wim, D., "Discrete Cepstrum Coefficientsas Perceptual Features", International Computer Music Conference (ICMC), pp.1~4 (2003)
- 오영환, "음성언어 정보처리" (1998), 홍릉과학출판사