Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A CELP Speech Coder Using Dispersed-Pulse and Random Codebook

분산펄스와 랜덤 코드북을 이용한 CELP 음성 부호화기

  • 황윤성 (전북대학교 전자정보공학부) ;
  • 문인섭 (조선이공대학 정보통신과) ;
  • 이행우 (남서울대학교 전자정보통신공학부) ;
  • 김종교 (전북대학교 전자정보공학부)
  • Published : 2001.06.01
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Abstract

This paper presents dispersed-pulse and random codebook for CELP coder. This coder operates on speech frames of 20ms and generates an excitation vector by convoluting dispersion vectors with signed pulses in an algebraic codevector. The improvement of pulse-based fixed codebook is performed at a low bit rate. A high performance fixed-codebook consists of a partial algebraic codebook and a random codebook in unvoiced and stationary noise regions. The proposed CELP coder is quantized with 4kb/s and is compared with G.729 (Bkb/s CS-ACELP). Subjective testing shows better quality than reference coders under some background noise conditions

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