서지주요정보
G.723.1과 SMV 음성부호화기를 위한 파라미터 직접 변환 방식의 상호부호화 알고리듬에 관한 연구 = A transcoding algorithm for G.723.1 and SMV speech coders via direct parameter transformation
서명 / 저자 G.723.1과 SMV 음성부호화기를 위한 파라미터 직접 변환 방식의 상호부호화 알고리듬에 관한 연구 = A transcoding algorithm for G.723.1 and SMV speech coders via direct parameter transformation / 서성호.
저자명 서성호 ; Seo, Seong-Ho
발행사항 [대전 : 한국과학기술원, 2004].
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등록번호

8015196

소장위치/청구기호

학술문화관(문화관) 보존서고

MEE 04044

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초록정보

Today, there exist a wide variety of wire and wireless communication networks in which different speech coding standards are adopted. These networks are in the process of integrating into one IP-based next generation network(NGN), and in the integration process the compatibility between different coding standards is becoming a major issue. To address this problem, a transcoding algorithm, which is to convert the encoded bit stream of one speech coder into that of the other, is required. In this thesis, a transcoding algorithm for the Selectable Mode Vocoder (SMV) and G.723.1 speech coders via direct parameter transformation is proposed. The tandem transcoding is a simple solution to the compatibility problem between different coding standards; however, it is associated with a number of problems such as degradation in speech quality and the increases in computational complexity and delay. These problems can be alleviated by the proposed transcoding algorithm which converts the parameters of one coder to those of the other without going through the complete decoding and encoding process. The proposed algorithm is composed of five parts: parameter decoding, line spectral pair (LSP) conversion, simplified frame classification, pitch conversion for adaptive codebook (ACB) and fixed codebook (FCB) conversion. The proposed algorithm is implemented in the fixed-point format using the C language in the Windows platform. The evaluation results show that the proposed algorithm achieves equivalent speech quality to that of tandem transcoding with reduced computational complexity and delay.

서지기타정보

서지기타정보
청구기호 {MEE 04044
형태사항 vii, 57 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Seong-Ho Seo
지도교수의 한글표기 : 유창동
지도교수의 영어표기 : Chang-D. Yoo
학위논문 학위논문(석사) - 한국과학기술원 : 전기및전자공학전공,
서지주기 참고문헌 : p. 55-57
주제 상호부호화
파라미터 직접 변환
음성부호화
TRANSCODING
DIRECT PARAMETER TRANSFORMATION
SPEECH CODING
G.723.1
SMV
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