Design of Low Bits Rate Transform Excitation Wide Band Speech and Audio Coder of Analysis-by-Synthesis Structure

Sunghoon Jang; Kibong Hong; Insung Lee

doi:10.7776/ASK.2012.31.7.472

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2012 Vol.31, Issue 7 Preview Page Next Page

Design of Low Bits Rate Transform Excitation Wide Band Speech and Audio Coder of Analysis-by-Synthesis Structure 분석/합성 구조의 저 전송률 변환여기 광대역 음성/오디오 부호화기 설계

31 October 2012. pp. 472-479

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Abstract

This paper is aimed to design 9.2 kbps low bits late transform excitation coder that target to voice and audio signal. To set up low bit rate, we used Band-selection in frequency domain and gain-shape quantization and AbS structure. To decrease lots of calculation from ABS structure, we used each band IDFT and synthesis. And we designed non-transfer band for performance by inserting comfort noise. We propose coder that has low bit rate and similar performance comparing with original 10.4 kbps AMR-WB+ TCX mode.

Keywords

AMR-WB+

TCX

Band-selection

AbS

mixed signal

Transform coder

본 논문은 음성과 오디오의 혼합 콘텐츠를 대상으로 하는 9.2 kbps 저 전송률 변환여기 부호화기 설계를 목표로 한다. 저 전송률 환경을 위하여 주파수 영역 신호의 중요도에 따른 Band-Selection 방법과 Gain-Shape 양자화를 이용한 Analysis by Synthesis(AbS) 구조를 이용한다. AbS 구조를 이용하는 과정에서 발생하게 되는 연산량을 감소시키기 위하여 밴드별 IDFT를 취하고 합성하는 방법을 이용한다. 전송 되지 않는 구간에 대하여 Comfort Noise를 삽입 함으로써 음질 저하 없이 설계한다. 기존의 TCX모드와 비교하여 저 전송률에서 성능의 저하 없는 부호화기를 제안한다.

키워드

AMR-WB+

TCX

Band-selection

AbS

혼합 신호

변환 코더

References

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 31
No :7
Pages :472-479
Received Date : 2012-05-07
Revised Date : 2012-06-21
Accepted Date : 2012-07-27
DOI :https://doi.org/10.7776/ASK.2012.31.7.472

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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