{"created":"2023-07-27T06:54:41.610974+00:00","id":50120,"links":{},"metadata":{"_buckets":{"deposit":"b39de105-c299-47ad-86b9-7bf7457709fe"},"_deposit":{"created_by":18,"id":"50120","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"50120"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00050120","sets":["2812:2813:2826"]},"author_link":["90771","377"],"item_9_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2008-05","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"51p.","bibliographicVolumeNumber":"2006-2007","bibliographic_titles":[{"bibliographic_title":"平成19(2007)年度 科学研究費補助金 基盤研究(C) 研究成果報告書"},{"bibliographic_title":"2007 Fiscal Year Final Research Report","bibliographic_titleLang":"en"}]}]},"item_9_creator_33":{"attribute_name":"著者別表示","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{}],"nameIdentifiers":[{},{}]}]},"item_9_description_21":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"1.2種類のステレオ音響エコーキャンセラ(SAEC)を組み合わせた高速収束アルゴリズムの開発不定解の分布解析を行った。周波数領域においては、2個の互いに異なる不定解を推定し、4元連立方程式を解くことにより不定解全ての分布範囲を特定できる。さらに、2人の話者に対する不定解が求められると、4元連立方程式を解くことにより最適解を推定できる。また、2個のSAECを用いて最適解を推定する方式を開発した。初期値の異なる2個のSAECを用いて、2個の不定解を同時に推定する。独立性の高い不定解を得る必要があるので、定期的に不定解の独立性を判定し、独立性が低い場合には初期値を再設定する方式を開発した。初期値として現在の推定ベクトルと直交するものを選ぶことにより、独立性を高める。\n2.実時間信号処理システムの構築最新のディジタルシグナルプロセッサ(DSP)を用いた実時間信号処理装置を導入した。\n3.Intel IA32プロセッサを用いたSAECの実現PCベースの遠隔会議システムを想定して、Intel IA32プロセッサを用いてSAECを実現した。ベクトル演算命令を有効に利用できるよう種々の最適化を行い、最適化前のプログラムに対して約4倍の高速化に成功した。比較的低価格のPCでもSAECの実時間処理が可能になるため、SAECを用いた高品位遠隔会議システムを低価格で容易に導入可能になる。\n4.入力信号の白色化による高速収束アルゴリズムの検討入力信号を白色化することによって、有色信号に対する収束速度を改善する方法を検討した。白色化フィルタの位置を見直すことにより、同期が不要な構成を検討した。タップ数が少ない場合には有効であるが、タップ数が多いと大きな改善は見られないという点が課題である。","subitem_description_type":"Abstract"},{"subitem_description":"1. Fast convergence algorithm by using two stereophonic acoustic echo cancellers (SAECs)\nThe distribution of the irregular solutions in the frequency domain has been analyzed. By estimating two independent irregular solutions and solving a simultaneous equation with four unknown variables, the distribution of all irregular solutions can be determined The optimum solution can be found by determining the irregular solutions for two talkers and solving another simultaneous equation with four unknown variables A fast convergence algorithm using two SAECs has been developed. Two irregular solutions can be estimated by using two SAECs with different initial coefficients. To estimate independent solutions, the independency is evaluated periodically. The SAECs are initialized when two solutions am not independent enough. A new initial value is so selected as to be orthogonal against another coefficient.\n2. Real-time signal-processing systems\nNew real-time signal-processing systems with fist digital signal processors has been introduced.\n3. Implementation of SAEC on Intel IA-32 Processors For low-cost PC-based teleconferencing, an SAEC has been implemented on Intel IA-32 processors. Some optimization have been carried out to use vector operations effectively. The optimized program is almost four times as fast as a conventional code.\n4 Fast convergence algorithm by input-signal whitening\nAn improvement of the convergence speed has been studied which utilizes input-signal whitening. By modifying the locations of the whitening filters, the proposed algorithm dips not have to synchronize the main filter coefficients with those for the whitening filter as in the Lattice-based whitening method. Though this approach is effective when the number of taps is small, an improvement for a large number of taps should be a future study.","subitem_description_type":"Abstract"}]},"item_9_description_22":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"研究課題/領域番号:18560371, 研究期間(年度):2006-2007","subitem_description_type":"Other"},{"subitem_description":"出典：「高音質・高速収束ステレオエコーキャンセラに関する研究」研究成果報告書　課題番号18560371\n  (KAKEN：科学研究費助成事業データベース（国立情報学研究所）)\n　　　本文データは著者版報告書より作成","subitem_description_type":"Other"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24517/00056432","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_17":{"attribute_name":"公開者","attribute_value_mlt":[{"subitem_publisher":"金沢大学理工研究域フロンティア工学系"}]},"item_9_relation_28":{"attribute_name":"関連URI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/search/?qm=70303261"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/search/?qm=70303261","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560371/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560371/","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-18560371/185603712007kenkyu_seika_hokoku_gaiyo/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-18560371/185603712007kenkyu_seika_hokoku_gaiyo/","subitem_relation_type_select":"URI"}}]},"item_9_version_type_25":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-12-06"}],"displaytype":"detail","filename":"TE-PR-HIRANO-A-kaken 2008-51p.pdf","filesize":[{"value":"1.2 MB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"TE-PR-HIRANO-A-kaken 2008-51p.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/50120/files/TE-PR-HIRANO-A-kaken 2008-51p.pdf"},"version_id":"2680c87c-65fe-445e-857c-cbd892f34677"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"高音質・高速収束ステレオエコーキャンセラに関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"高音質・高速収束ステレオエコーキャンセラに関する研究"},{"subitem_title":"Recearch on stereophonic acoustic echo canceller with both high sound quality and fast convergence speed","subitem_title_language":"en"}]},"item_type_id":"9","owner":"18","path":["2826"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-12-06"},"publish_date":"2019-12-06","publish_status":"0","recid":"50120","relation_version_is_last":true,"title":["高音質・高速収束ステレオエコーキャンセラに関する研究"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2023-07-27T14:23:49.239864+00:00"}