{"created":"2023-05-15T08:20:18.029594+00:00","id":237,"links":{},"metadata":{"_buckets":{"deposit":"5e678685-ebfb-455a-bb0b-4ebf10d21577"},"_deposit":{"created_by":3,"id":"237","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"237"},"status":"published"},"_oai":{"id":"oai:shobi-u.repo.nii.ac.jp:00000237","sets":["10:1:41"]},"author_link":["398","399","400"],"control_number":"237","item_3_biblio_info_12":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004-12-24","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"55","bibliographicPageStart":"45","bibliographicVolumeNumber":"5","bibliographic_titles":[{"bibliographic_title":"尚美学園大学芸術情報学部紀要","bibliographic_titleLang":"ja"},{"bibliographic_title":"Bulletin of the Faculty of Informatics for Arts, Shobi University","bibliographic_titleLang":"en"}]}]},"item_3_description_10":{"attribute_name":"抄録(日)","attribute_value_mlt":[{"subitem_description":"音声の圧縮符号化に伴う品質劣化の評価法はいくつかの客観的評価法が提案され、利用されている。これらは、主に通信品質の絶対評価値である平均オピニオン値を極力精度良く推定しようとするものであり、音声圧縮符号化アルゴリズムを電話網に適用するときの設計指針を与えるために利用されている。しかし、特に僅少な品質差を問題とする音声符号化方式の相互接続可能性を評価するには、精度の点で不満がある。ITU-Tの8 kbit/s音声符号化方式G.729とそのAnnex A, B, C, D, Eは勧告成立以来、無線用途をはじめとして広く利用されてきた。更に、ソフトウェアによるインプリメンテーションを求める市場の要請に応じて、ITU-Tは既存の可変レートAnnexに対する浮動小数点演算版を新規Annexとして勧告化することとした。筆者らは、既存の勧告との相互接続性を確保するための品質的要求条件を明確化するとともに、品質評価項目と評価手段を適切に設計し、ITU-Tにおける勧告化手順に反映させた。また、その手順に沿って新規Annex案の品質試験を実施し、その品質が勧告とするに足ることを明らかにした。本論文では、G.729の新しい拡張としてAnnex C+ が勧告化された経緯、要求条件に対する品質評価手法と評価項目、および勧告化にあたって実施した評価試験と結果を述べる。","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_3_description_11":{"attribute_name":"抄録(英)","attribute_value_mlt":[{"subitem_description":"Subjective quality assessment method and the results for bit-reduction speech coding with very small quality difference are presented. Although some objective assessment methods are already applied in telephone network design for bit-reduction speech coding, those are mostly to estimate the Mean Opinion Scores from Absolute Category Rating tests, and are insufficient in resolution to judge whether or not compatible are encoding and decoding with mismatched arithmetic precision in implementation. The 8-kbit/s speech coding CS-ACELP and its extensions are recommended as G.729 and Annexes A, B, C, D, and E in ITU-T, and are widely deployed in telecommunication networks. Considering the market demands are getting stronger for variable rate, voice-activity detection, and software implementation under environment of spreading IP network and PC's cost reduction, ITU-T planned to recommend a new Annex for G.729 of software implementaion with variable-bit-rate operation and voice-activity detection. Authors clarified the requirements for interoperability between fixed-point arithmetic implementation in current Recommendation and floating-point implementation in new Recommendation and designed a suitable subjective assessment method, and necessary testing items. They also achieved the subjective tests and showed that the objects have good quality and are interoperable. Accordingly the proposed software implementation is successfully recommended as Annex C+ for G.729.","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_3_description_15":{"attribute_name":"表示順","attribute_value_mlt":[{"subitem_description":"4","subitem_description_type":"Other"}]},"item_3_description_16":{"attribute_name":"アクセション番号","attribute_value_mlt":[{"subitem_description":"KJ00004919509","subitem_description_type":"Other"}]},"item_3_description_8":{"attribute_name":"記事種別(日)","attribute_value_mlt":[{"subitem_description":"論文","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_3_description_9":{"attribute_name":"記事種別(英)","attribute_value_mlt":[{"subitem_description":"Article","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_3_publisher_22":{"attribute_name":"出版社","attribute_value_mlt":[{"subitem_publisher":"尚美学園大学芸術情報学部","subitem_publisher_language":"ja"}]},"item_3_source_id_1":{"attribute_name":"雑誌書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AA11624171","subitem_source_identifier_type":"NCID"}]},"item_3_source_id_19":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"13471023","subitem_source_identifier_type":"PISSN"}]},"item_3_text_6":{"attribute_name":"著者所属(日)","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"尚美学園大学芸術情報学部情報表現学科"},{"subitem_text_language":"ja","subitem_text_value":"日本電信電話株式会社NTTサイバースペース研究所"},{"subitem_text_language":"ja","subitem_text_value":"日本電信電話株式会社NTTサイバースペース研究所"}]},"item_3_text_7":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Shobi University"},{"subitem_text_language":"en","subitem_text_value":"NTT Cyber Space Laboratories, NTT Corporation"},{"subitem_text_language":"en","subitem_text_value":"NTT Cyber Space Laboratories, NTT Corporation"}]},"item_3_title_3":{"attribute_name":"論文名よみ","attribute_value_mlt":[{"subitem_title":"キンショウナ ヒンシツサ オ モンダイ ト スル オンセイ フゴウカ ホウシキ ノ ヒンシツ ヒョウカ ジョウホウ ヒョウゲン ガッカ トクシュウゴウ","subitem_title_language":"ja-Kana"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"林, 伸二","creatorNameLang":"ja"},{"creatorName":"ハヤシ, シンジ","creatorNameLang":"ja-Kana"},{"creatorName":"HAYASHI, Shinji","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"栗原, 祥子","creatorNameLang":"ja"},{"creatorName":"クリハラ, サチコ","creatorNameLang":"ja-Kana"},{"creatorName":"KURIHARA, Sachiko","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"片岡, 章俊","creatorNameLang":"ja"},{"creatorName":"カタオカ, アキトシ","creatorNameLang":"ja-Kana"},{"creatorName":"KATAOKA, Akitoshi","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"G.729","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"8 kbit/s","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"CS-ACELP","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"音声符号化","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"拡張方式","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"Annex C+","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"品質評価","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"G.729","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"8 kbit/s","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"CS-ACELP","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"speech coding","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Annex","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"quality evaluation","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"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":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"僅少な品質差を問題とする音声符号化方式の品質評価 (情報表現学科特集号)","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"僅少な品質差を問題とする音声符号化方式の品質評価 (情報表現学科特集号)","subitem_title_language":"ja"},{"subitem_title":"Quality Assessment for speech coding with very small quality difference","subitem_title_language":"en"}]},"item_type_id":"3","owner":"3","path":["41"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2017-04-21"},"publish_date":"2017-04-21","publish_status":"0","recid":"237","relation_version_is_last":true,"title":["僅少な品質差を問題とする音声符号化方式の品質評価 (情報表現学科特集号)"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-10-15T13:09:27.398570+00:00"}