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

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

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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.

Publication: IEICE TRANSACTIONS on Information Vol.E87-D No.6 pp.1496-1506

Publication Date: 2004/06/01

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Type of Manuscript: PAPER

Category: Speech and Hearing

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Yusuke HIWASAKI, Kazunori MANO, Kazutoshi YASUNAGA, Toshiyuki MORII, Hiroyuki EHARA, Takao KANEKO, "Design of a Robust LSP Quantizer for a High-Quality 4-kbit/s CELP Speech Coder" in IEICE TRANSACTIONS on Information, vol. E87-D, no. 6, pp. 1496-1506, June 2004, doi: .
Abstract: 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.
URL: https://global.ieice.org/en_transactions/information/10.1587/e87-d_6_1496/_p

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@ARTICLE{e87-d_6_1496,
author={Yusuke HIWASAKI, Kazunori MANO, Kazutoshi YASUNAGA, Toshiyuki MORII, Hiroyuki EHARA, Takao KANEKO, },
journal={IEICE TRANSACTIONS on Information},
title={Design of a Robust LSP Quantizer for a High-Quality 4-kbit/s CELP Speech Coder},
year={2004},
volume={E87-D},
number={6},
pages={1496-1506},
abstract={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.},
keywords={},
doi={},
ISSN={},
month={June},}

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TY - JOUR
TI - Design of a Robust LSP Quantizer for a High-Quality 4-kbit/s CELP Speech Coder
T2 - IEICE TRANSACTIONS on Information
SP - 1496
EP - 1506
AU - Yusuke HIWASAKI
AU - Kazunori MANO
AU - Kazutoshi YASUNAGA
AU - Toshiyuki MORII
AU - Hiroyuki EHARA
AU - Takao KANEKO
PY - 2004
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E87-D
IS - 6
JA - IEICE TRANSACTIONS on Information
Y1 - June 2004
AB - 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.
ER -