Design of a robust LSP quantizer for a high-quality 4-kbit/s CELP speech coder

Yusuke Hiwasaki*, Kazunori Mano, Kazutoshi Yasunaga, Toshiyuki Morii, Hiroyuki Ehara, Takao Kaneko


研究成果: Article査読

2 被引用数 (Scopus)


This paper presents an efficient LSP quantizer implementation for low bit-rate coders. The major feature of the quantizer is that it uses a truncated cepstral distance criterion for the code selection procedure. This approach has generally been considered too computationally costly. We utilized the quantizer with a moving-average predictor, two-stage-split vector quantizer and delayed decision. We have investigated the optimal parameter settings in this case and incorporated the quantizer thus obtained into an ITU-T 4-kbit/s speech coding candidate algorithm with a bit budget of 21 bits. The objective performance is better than that with a conventional weighted mean-square criterion, while the complexity is still kept to a reasonable level. The paper also describes the codebook design and techniques that were employed to achieve robustness in noisy channel conditions.

ジャーナルIEICE Transactions on Information and Systems
出版ステータスPublished - 2004 6月

ASJC Scopus subject areas

  • ソフトウェア
  • ハードウェアとアーキテクチャ
  • コンピュータ ビジョンおよびパターン認識
  • 電子工学および電気工学
  • 人工知能


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