Browse > Article

High-Band Codec for Bandwidth Scalable Wideband Speech Codec  

Kim Youngvo (광운대학교 전자공학과)
Jeong Byounghak (광운대학교 전자공학과)
Son Chang-Yong (삼성종합기술원 Computing Lab)
Sung Ho-Sang (삼성종합기술원 Computing Lab)
Park Hochong (광운대학교 전자공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.24, no.7, 2005 , pp. 395-401 More about this Journal
Abstract
In this paper, the high-band codec for bandwidth scalable wideband speech codec is proposed. The wideband input speech signal is separated into low-band signal and high-band signal, and the low-band signal is encoded by the standard narrow-band speech codec and the high-band signal is encoded by the proposed codec. In the high-band codec. the signal is transformed into frequency domain by MLT on a subframe basis, and MLT coefficients are splitted into magnitude and sign for quantization. The magnitudes of MLT coefficients are arranged into several time-frequency bands and each band is quantized in 2D-DCT domain, where the low-band information is utilized for better performance. The sign of MLT coefficient is quantized based on a priority selection process with the weighting measurement. The objective and subjective performance of wideband speech codec including the proposed high-band codec is measured, and it is confirmed that the proposed codec has better performance than 32kbps G.722.1.
Keywords
wideband speech codec; bandwidth scalability; MLT; 2D-DCT;
Citations & Related Records
연도 인용수 순위
  • Reference
1 ITU-T Rec. G.729, 'Coding of speech at 8kbit/s using conjugate-structure algebraic- code-excited linearprediction(CS-ACELP):' 1996
2 A. McCree, 'A 14kbps wideband speech coder with a parametric highband model:' Proc. IEEE ICASSP, 1153-1156,2000
3 ITU- Rec. G. 722.1, 'Coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss,' 1999
4 Kyung Tae Kim, Sung Kyo .Jung, Young Cheol Park, and Dae Hee Youn, 'A new bandwidth scalable wideband speech/audio coder', Proc. IEEE ICASSP, 657-660, 2002
5 이우석, 박호종, 손창용, 이영범, '대역폭 계층 구조의 광대역 음성부호화기 개발,'한국음향학회지, 23 (6), 400-406, 2004. 8
6 ITU-T Recommendation P.862. 'Perceptual evaluation of speech quality,' Version 1.2-2, August 2002
7 K. Koishida, V Cuperrnan and A. Gersho, 'A 16-kbit/s bandwidth scalable audio coder band on the G.729 standard:' Proc. IEEE ICASSP, 1149-1152, 2002