4-kbit /s Multi-Dispersed-Pulse-Based CELP (MDP-CELP) Speech Coder

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概要

• 論文の詳細を見る

• This paper presents a high quality 4-kbit/s speech coding algorithm based on a CELP algorithm. The coder operates on speech frames of 20 ms. The algorithm has following four main features: multiple sub-codebooks, backward adaptive mode switching, dispersed-pulse structure, and noise post-processing. The multiple sub-codebooks consist of a pulse-codebook and a random-codebook so that they can handle both signals, noise-like (e.g. unvoiced, stationary noise) and pulse-like (e.g. voiced). The backward adaptive mode switching is performed using decoded parameters; therefore, no additional mode bit is transmitted. The random-codebook size is switched with the backward adaptively selected mode. The subjective quality of unvoiced speech or noise-like signal can be improved by this switching operation because the random-codebook size is greatly increased in such signal mode. The dispersed-pulse structure provides better performance of sparse pulse excitation using dispersed pulses instead of simple unit pulses. The noise postprocessing employs a stationary background noise generator for producing stationary noise signal. It significantly improves subjective quality of decoded signal under various background noise conditions. Subjective listening tests are conducted in accordance with ACR and DCR tests. The ACR test results indicate that the fundamental performance of the MDP-CELP is equivalent to that of 32-kbit/s adaptive differential pulse code modulation (ADPCM). The DCR test results show that the performance of the MDP-CELP is equivalent to or better than that of 8-kbit/s conjugate-structure algebraic code excited linear prediction (CS- ACELP) under several background noise conditions.

• 2002-02-01

著者

• EHARA Hiroyuki

  Wireless Solution Laboratories, Matsushita Communication Industrial Co., Ltd.

• YOSHIDA Koji

  Wireless Solution Laboratories, Matsushita Communication Industrial Co., Ltd.

• YASUNAGA Kazutoshi

  Mobile Communication Research Laboratory, Matsushita Research Institute Tokyo, Inc.

• MORII Toshiyuki

  Mobile Communication Research Laboratory, Matsushita Research Institute Tokyo, Inc.

• Ehara Hiroyuki

  Next-generation Mobile Communications Development Center Matsushita Electric Industrial Co. Ltd.

• Yasunaga Kazutoshi

  Broadband Communications Development Center Matsushita Electric Industrial Co. Ltd.

• Yoshida K

  Broadband Communications Development Center Matsushita Electric Industrial Co. Ltd.

• MORII Toshiyuki

  AV Core Technology Development Center, Matsushita Electric Industrial Co., Ltd.

• Morii T

  Av Core Technology Development Center Matsushita Electric Industrial Co. Ltd.

• MORII Toshiyuki

  Faculty of Human Development, Division of Sciences for Natural Environment : Graduate School of Science and Technology Kobe University

• MORII Toshiyuki

  Graduate School of Science and Technology and College of Liberal Arts Kobe University

• MORII Toshiyuki

  Graduate School of Science and Technology and Faculty Human Development, Kobe University

関連論文

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