Improvement of the post-processing algorithm in AMR-NB speech codec

Jingyu Hou; Shenghui Zhao; Huinan Li

doi:10.1016/j.procs.2021.02.070

Improvement of the post-processing algorithm in AMR-NB speech codec

Jingyu Hou
, Shenghui Zhao^*
, Huinan Li

^*Corresponding author for this work

School of Information and Electronics

Beijing Institute of Technology

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

Narrow band adaptive multi-rate (AMR-NB) is a speech codec that supports multiple bit-rate modes and is widely used in mobile communication systems. However, the synthesized speech quality of its lower bit-rate modes is not very satisfying. This paper aims to improve the synthesized speech quality of the lower bit-rate modes of AMR-NB (e.g., 4.75kb/s) by optimizing its post-processing algorithm. The optimization mainly focuses on four modules including the formant filter with adjusted correction factor, the fixed codebook gain smoothing, the adaptive gain control and the anti-sparse processing. The experimental results show that the AMR-NB codec with the optimized post-processing algorithm achieves an obvious improvement of the synthesized speech quality, and the lower bit-rate mode achieves the bigger improvement.

Original language	English
Pages (from-to)	349-354
Number of pages	6
Journal	Procedia Computer Science
Volume	183
DOIs	https://doi.org/10.1016/j.procs.2021.02.070
Publication status	Published - 2021
Event	10th International Conference of Information and Communication Technology, ICICT 2020 - Wuhan, China Duration: 13 Nov 2020 → 15 Nov 2020

Keywords

AMR
Post-processing
Speech codec

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10.1016/j.procs.2021.02.070

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title = "Improvement of the post-processing algorithm in AMR-NB speech codec",

abstract = "Narrow band adaptive multi-rate (AMR-NB) is a speech codec that supports multiple bit-rate modes and is widely used in mobile communication systems. However, the synthesized speech quality of its lower bit-rate modes is not very satisfying. This paper aims to improve the synthesized speech quality of the lower bit-rate modes of AMR-NB (e.g., 4.75kb/s) by optimizing its post-processing algorithm. The optimization mainly focuses on four modules including the formant filter with adjusted correction factor, the fixed codebook gain smoothing, the adaptive gain control and the anti-sparse processing. The experimental results show that the AMR-NB codec with the optimized post-processing algorithm achieves an obvious improvement of the synthesized speech quality, and the lower bit-rate mode achieves the bigger improvement.",

keywords = "AMR, Post-processing, Speech codec",

author = "Jingyu Hou and Shenghui Zhao and Huinan Li",

note = "Publisher Copyright: {\textcopyright} 2021 The Authors. Published by Elsevier B.V.; 10th International Conference of Information and Communication Technology, ICICT 2020 ; Conference date: 13-11-2020 Through 15-11-2020",

year = "2021",

doi = "10.1016/j.procs.2021.02.070",

language = "English",

volume = "183",

pages = "349--354",

journal = "Procedia Computer Science",

issn = "1877-0509",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Improvement of the post-processing algorithm in AMR-NB speech codec

AU - Hou, Jingyu

AU - Zhao, Shenghui

AU - Li, Huinan

PY - 2021

Y1 - 2021

N2 - Narrow band adaptive multi-rate (AMR-NB) is a speech codec that supports multiple bit-rate modes and is widely used in mobile communication systems. However, the synthesized speech quality of its lower bit-rate modes is not very satisfying. This paper aims to improve the synthesized speech quality of the lower bit-rate modes of AMR-NB (e.g., 4.75kb/s) by optimizing its post-processing algorithm. The optimization mainly focuses on four modules including the formant filter with adjusted correction factor, the fixed codebook gain smoothing, the adaptive gain control and the anti-sparse processing. The experimental results show that the AMR-NB codec with the optimized post-processing algorithm achieves an obvious improvement of the synthesized speech quality, and the lower bit-rate mode achieves the bigger improvement.

AB - Narrow band adaptive multi-rate (AMR-NB) is a speech codec that supports multiple bit-rate modes and is widely used in mobile communication systems. However, the synthesized speech quality of its lower bit-rate modes is not very satisfying. This paper aims to improve the synthesized speech quality of the lower bit-rate modes of AMR-NB (e.g., 4.75kb/s) by optimizing its post-processing algorithm. The optimization mainly focuses on four modules including the formant filter with adjusted correction factor, the fixed codebook gain smoothing, the adaptive gain control and the anti-sparse processing. The experimental results show that the AMR-NB codec with the optimized post-processing algorithm achieves an obvious improvement of the synthesized speech quality, and the lower bit-rate mode achieves the bigger improvement.

KW - AMR

KW - Post-processing

KW - Speech codec

UR - https://www.scopus.com/pages/publications/85104884578

U2 - 10.1016/j.procs.2021.02.070

DO - 10.1016/j.procs.2021.02.070

M3 - Conference article

AN - SCOPUS:85104884578

SN - 1877-0509

VL - 183

SP - 349

EP - 354

JO - Procedia Computer Science

JF - Procedia Computer Science

T2 - 10th International Conference of Information and Communication Technology, ICICT 2020

Y2 - 13 November 2020 through 15 November 2020

ER -

Improvement of the post-processing algorithm in AMR-NB speech codec

Abstract

Keywords

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