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Bandwidth Scalable Wideband Speech Codec  

이우석 (광운대학교 전자공학과)
손창용 (삼성종합기술원 HCI 연구)
이영범 (삼성종합기술원 HCI 연구)
박호종 (광운대학교 전자공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.23, no.6, 2004 , pp. 481-487 More about this Journal
Abstract
In this paper. the structure of bandwidth scalable wideband speech codec and its high-band codec are proposed. In the high-band codec. the signal is divided into frequency bands. and each band is quantized in DCT domain. The DCT coefficients are splitted into magnitude and sign, and each is quantized independently by a specialized method based on its characteristics. In addition. the quantized gain parameter in the low-band codec is utilized in the high-band codec for an enhanced performance. The bandwidth scalable wideband speech codec using G.729E for low-band and the proposed codec for high-band is developed, and it is confirmed that the proposed codec has better subjective performance than 24kbps G.722.1.
Keywords
DCT; Wideband speech codec; Scalable codec; Bandwidth scalability; DCT;
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