講演抄録/キーワード |
講演名 |
2013-05-16 14:25
REDIALを用いた狭帯域音声の帯域復元 ○グェン ドゥックズイ・鈴木雅之・峯松信明・広瀬啓吉(東大) EA2013-7 SIP2013-7 SP2013-7 |
抄録 |
(和) |
広帯域復元技術(ABE)は電話システムの狭帯域音声の音質を改善するために提案された技術である.多くのアルゴリズムではABEを2つの独立な問題に分けて考えている:1つはスペクトル包絡の拡張ともう1つは励起信号の拡張である.本稿ではスペクトル包絡の拡張問題に着目し,REDIAL( REgularized piecewise linear mapping with DIscriminative region weighting And Long-span features)に基づく新しい手法を提案する.REDIALは音声強調で広く使われている手法であるSPLICEに基づいて提案された手法である.本研究の提案したREDIALベース手法では狭帯域特徴量と広帯域特徴量との非線形関係を線形変換の和で近似する.話者依存・話者非依存条件において客観評価・主観評価実験を行い,従来手法のGMMベース法と比較した.本稿ではその実験結果および提案手法の有効性を報告する. |
(英) |
Artificial Bandwidth Extension (ABE) has been introduced to improve perceived speech quality and intelligibility of narrowband telephone speech. Most of the existing algorithms divided ABE into 2 sub-problems, namely extension of the excitation signal and that of the spectral envelope. In this paper, we propose a new method for spectral envelope extension based on REgularized piecewise linear mapping with DIscriminative region weighting And Long-span features (REDIAL). REDIAL is a revised version of SPLICE, a well-known method for speech enhancement. In REDIAL, however, discriminative model is introduced for the space division step. The proposed REDIAL-based method approximates non-linear transformation from narrowband features to their wideband counterpart by a summation of piecewise linear transformations. The proposed method was compared with the widely used GMM-based method, through objective and subjective evaluations in both speaker-dependent and speaker-independent conditions. Both evaluations showed that the proposed method significantly outperforms the conventional GMM-based method. |
キーワード |
(和) |
広帯域復元 / REDIAL / スペクトル包絡拡張 / 客観評価・主観評価 / / / / |
(英) |
Artificial Bandwidth Extension / REDIAL / spectral envelope extension / objective and subjective evaluations / / / / |
文献情報 |
信学技報, vol. 113, no. 29, SP2013-7, pp. 37-42, 2013年5月. |
資料番号 |
SP2013-7 |
発行日 |
2013-05-09 (EA, SIP, SP) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
EA2013-7 SIP2013-7 SP2013-7 |
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