{"created":"2023-07-25T09:05:59.026473+00:00","id":4139,"links":{},"metadata":{"_buckets":{"deposit":"6aa5841f-6a8c-4a5e-bfd8-c5573bf6342c"},"_deposit":{"created_by":3,"id":"4139","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"4139"},"status":"published"},"_oai":{"id":"oai:toyama.repo.nii.ac.jp:00004139","sets":["496:556:559:560:585"]},"author_link":["56254","56255","56257","56256"],"item_3_alternative_title_19":{"attribute_name":"その他（別言語等）のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Considerations on delta modulation"}]},"item_3_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1974-03","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"8","bibliographicPageStart":"1","bibliographicVolumeNumber":"25","bibliographic_titles":[{"bibliographic_title":"富山大学工学部紀要"}]}]},"item_3_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"In delta modulation as well as PCM it is able to develope its S/N ratio by introducing the method of the companding.\nIn this paper we discribe about the useflness of the amplitude weighting coefficient {1,1,2,4,9,・・・,9} which we proposed. This coefficient is especially superior to in both the noise characteristic and the following characteristic operating by the high frequecy input.","subitem_description_type":"Abstract"},{"subitem_description":"ティジタル通信の代表的なものとして，パルス符号変調（pulse code modulation;以下PCMと略記）とデルタ変調（delta modulation;以下ΔMと略記）の二つをあげることができる。\nPCMは入力信号の符号化の過程において，量子化された各標本値の大きさに応じてnビット（例えば8ピット）のパルスを割り当て，変調系を構成する。\nこれに対しΔMは連続する二つの標本値の差に1ビットのパルスを割り当てて変調系を構成するもので，PCMに比べ標本化周波数f_sが高くなる欠点があるが，変調器が著しく簡単となる利点がある。\nPCMでは量子化の過程で圧伸を行なうことによってS/N比の改善を行なっているが，ΔMにおいてもその様な圧伸を導入することにより，TV画像信号伝送の分野において，PCM方式に匹敵する性能の向上をはかってきた。\n圧伸の方法に瞬時圧伸を用いた圧伸1ピットΔM方式は，入力信号の変化の大きさに応じてステップサイズΔを変え，低周波入力時のgranular（量子化）雑音並びに高周波入力時のslope overload（勾配過負荷）雑音を軽減する目的で考え出された方式で，その振幅荷重係数{U_1，U_2，......，U_n}としては，安定性の立場から \nU_i≤<Σ>^^^<i-1>_<J=1>U_j.......① \nを満たすものが望ましく，この条件のもとで{1,1,2,3,5,......5}（係数II）の方式が最も有効あることが報告されている。\nしかしながら高周波入力時のslope overload雑音特性を改善する見地からは，最大量子化ステップU_<ma x>(=U_n)をできるだけ大きくすることが望ましく，著者等は振幅荷量係数{1,1,2,4,9,1.....,9}（係数I）の方式を考えた。\nこの方式は安定条件式①を満たさず不安定性が懸念されるが，その不安定機構を解明した結果，不安定な振動を生ずることは極めてまれで，実用上ほとんど問題がないことが分かった。\nそこで実験装置を試作し，上記二つの方式の比較を中心に種々の実験・検討を行なったので，その結果をここに報告する。","subitem_description_type":"Abstract"}]},"item_3_description_40":{"attribute_name":"資源タイプ(DSpace)","attribute_value_mlt":[{"subitem_description":"Article","subitem_description_type":"Other"}]},"item_3_description_6":{"attribute_name":"引用","attribute_value_mlt":[{"subitem_description":"富山大学工学部紀要，25","subitem_description_type":"Other"}]},"item_3_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"56256","nameIdentifierScheme":"WEKO"}],"names":[{"name":"MIZUNO, Kuniaki"}]},{"nameIdentifiers":[{"nameIdentifier":"56257","nameIdentifierScheme":"WEKO"}],"names":[{"name":"MATSUDA, Hideo"}]}]},"item_3_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15099/00004133","subitem_identifier_reg_type":"JaLC"}]},"item_3_publisher_33":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"富山大学工学部"}]},"item_3_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00175872","subitem_source_identifier_type":"NCID"}]},"item_3_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"03871339","subitem_source_identifier_type":"ISSN"}]},"item_3_subject_22":{"attribute_name":"国立国会図書館分類","attribute_value_mlt":[{"subitem_subject":"ZM2","subitem_subject_scheme":"NDLC"}]},"item_3_version_type_16":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"水野, 邦昭"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"松田, 秀雄"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-02-16"}],"displaytype":"detail","filename":"Kokiyo_25_01_Page001to008.pdf","filesize":[{"value":"4.7 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Kokiyo_25_01_Page001to008.pdf","url":"https://toyama.repo.nii.ac.jp/record/4139/files/Kokiyo_25_01_Page001to008.pdf"},"version_id":"48f4babd-d2bc-4478-bbb5-94ca025c74e2"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"デルタ変調","subitem_subject_scheme":"Other"},{"subitem_subject":"ディジタル通信","subitem_subject_scheme":"Other"},{"subitem_subject":"圧伸1ピットデルタ変調方式","subitem_subject_scheme":"Other"},{"subitem_subject":"圧伸1ピットデルタ変調装置","subitem_subject_scheme":"Other"},{"subitem_subject":"計算機シミュレーション","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":"デルタ変調について","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"デルタ変調について"}]},"item_type_id":"3","owner":"3","path":["585"],"pubdate":{"attribute_name":"公開日","attribute_value":"2012-09-27"},"publish_date":"2012-09-27","publish_status":"0","recid":"4139","relation_version_is_last":true,"title":["デルタ変調について"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-07-25T15:11:38.761833+00:00"}