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IP [n]" accesskey="n"><span>discussioni</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Sito"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Indice" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Indice</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">nascondi</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inizio</div> </a> </li> <li id="toc-Descrizione_tecnica_del_sistema_di_trasmissione" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Descrizione_tecnica_del_sistema_di_trasmissione"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Descrizione tecnica del sistema di trasmissione</span> </div> </a> <ul id="toc-Descrizione_tecnica_del_sistema_di_trasmissione-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Descrizione_tecnica_del_sistema_di_ricezione" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Descrizione_tecnica_del_sistema_di_ricezione"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Descrizione tecnica del sistema di ricezione</span> </div> </a> <ul id="toc-Descrizione_tecnica_del_sistema_di_ricezione-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliografia" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bibliografia"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Bibliografia</span> </div> </a> <ul id="toc-Bibliografia-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voci_correlate" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voci_correlate"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Voci correlate</span> </div> </a> <ul id="toc-Voci_correlate-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Altri_progetti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Altri_progetti"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Altri progetti</span> </div> </a> <ul id="toc-Altri_progetti-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Indice" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Indice" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Mostra/Nascondi l'indice" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Mostra/Nascondi l'indice</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">DVB-S</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vai a una voce in un'altra lingua. Disponibile in 25 lingue" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-25" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">25 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D8%B9%D9%8A%D8%A7%D8%B1_%D8%A8%D8%AB_%D8%A7%D9%84%D9%81%D9%8A%D8%AF%D9%8A%D9%88_%D8%A7%D9%84%D8%B1%D9%82%D9%85%D9%8A_%D9%81%D8%B6%D8%A7%D8%A6%D9%8A%D8%A7" title="معيار بث الفيديو الرقمي فضائيا - arabo" lang="ar" hreflang="ar" data-title="معيار بث الفيديو الرقمي فضائيا" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/DVB-S" title="DVB-S - catalano" lang="ca" hreflang="ca" data-title="DVB-S" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/DVB-S" title="DVB-S - ceco" lang="cs" hreflang="cs" data-title="DVB-S" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da badge-Q70893996 mw-list-item" title=""><a href="https://da.wikipedia.org/wiki/DVB-S" title="DVB-S - danese" lang="da" hreflang="da" data-title="DVB-S" data-language-autonym="Dansk" data-language-local-name="danese" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/DVB-S" title="DVB-S - tedesco" lang="de" hreflang="de" data-title="DVB-S" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/DVB-S" title="DVB-S - inglese" lang="en" hreflang="en" data-title="DVB-S" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/DVB-S" title="DVB-S - esperanto" lang="eo" hreflang="eo" data-title="DVB-S" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/DVB-S" title="DVB-S - spagnolo" lang="es" hreflang="es" data-title="DVB-S" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/DVB-S" title="DVB-S - estone" lang="et" hreflang="et" data-title="DVB-S" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/DVB-S" title="DVB-S - finlandese" lang="fi" hreflang="fi" data-title="DVB-S" data-language-autonym="Suomi" data-language-local-name="finlandese" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/DVB-S" title="DVB-S - francese" lang="fr" hreflang="fr" data-title="DVB-S" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/DVB-S" title="DVB-S - croato" lang="hr" hreflang="hr" data-title="DVB-S" data-language-autonym="Hrvatski" data-language-local-name="croato" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Penyiaran_Video_Digital_-_Satelit" title="Penyiaran Video Digital - Satelit - indonesiano" lang="id" hreflang="id" data-title="Penyiaran Video Digital - Satelit" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Skaitmenin%C4%97_palydovin%C4%97_televizija" title="Skaitmeninė palydovinė televizija - lituano" lang="lt" hreflang="lt" data-title="Skaitmeninė palydovinė televizija" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/DVB-S" title="DVB-S - malese" lang="ms" hreflang="ms" data-title="DVB-S" data-language-autonym="Bahasa Melayu" data-language-local-name="malese" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl badge-Q70894304 mw-list-item" title=""><a href="https://nl.wikipedia.org/wiki/DVB-S" title="DVB-S - olandese" lang="nl" hreflang="nl" data-title="DVB-S" data-language-autonym="Nederlands" data-language-local-name="olandese" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/DVB-S" title="DVB-S - polacco" lang="pl" hreflang="pl" data-title="DVB-S" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru badge-Q70893996 mw-list-item" title=""><a href="https://ru.wikipedia.org/wiki/DVB-S" title="DVB-S - russo" lang="ru" hreflang="ru" data-title="DVB-S" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Dru%C5%BEicov%C3%A9_digit%C3%A1lne_telev%C3%ADzne_vysielanie" title="Družicové digitálne televízne vysielanie - slovacco" lang="sk" hreflang="sk" data-title="Družicové digitálne televízne vysielanie" data-language-autonym="Slovenčina" data-language-local-name="slovacco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/DVB-S" title="DVB-S - svedese" lang="sv" hreflang="sv" data-title="DVB-S" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%81%E0%B8%9E%E0%B8%A3%E0%B9%88%E0%B8%AA%E0%B8%B1%E0%B8%8D%E0%B8%8D%E0%B8%B2%E0%B8%93%E0%B8%A0%E0%B8%B2%E0%B8%9E%E0%B8%94%E0%B8%B4%E0%B8%88%E0%B8%B4%E0%B8%97%E0%B8%B1%E0%B8%A5%E0%B8%9C%E0%B9%88%E0%B8%B2%E0%B8%99%E0%B8%94%E0%B8%B2%E0%B8%A7%E0%B9%80%E0%B8%97%E0%B8%B5%E0%B8%A2%E0%B8%A1" title="การแพร่สัญญาณภาพดิจิทัลผ่านดาวเทียม - thailandese" lang="th" hreflang="th" data-title="การแพร่สัญญาณภาพดิจิทัลผ่านดาวเทียม" data-language-autonym="ไทย" data-language-local-name="thailandese" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/DVB-S" title="DVB-S - turco" lang="tr" hreflang="tr" data-title="DVB-S" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-vec mw-list-item"><a href="https://vec.wikipedia.org/wiki/DVB-S" title="DVB-S - veneto" lang="vec" hreflang="vec" data-title="DVB-S" data-language-autonym="Vèneto" data-language-local-name="veneto" class="interlanguage-link-target"><span>Vèneto</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/DVB-S" title="DVB-S - wu" lang="wuu" hreflang="wuu" data-title="DVB-S" data-language-autonym="吴语" data-language-local-name="wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/DVB-S" title="DVB-S - cinese" lang="zh" hreflang="zh" data-title="DVB-S" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q384916#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespace"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/DVB-S" title="Vedi la voce [c]" accesskey="c"><span>Voce</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Discussione:DVB-S" rel="discussion" title="Vedi le discussioni relative a questa pagina [t]" accesskey="t"><span>Discussione</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Cambia versione linguistica" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">italiano</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Visite"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/DVB-S"><span>Leggi</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=DVB-S&veaction=edit" title="Modifica questa pagina [v]" accesskey="v"><span>Modifica</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=DVB-S&action=edit" title="Modifica il wikitesto di questa pagina [e]" accesskey="e"><span>Modifica wikitesto</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=DVB-S&action=history" title="Versioni precedenti di questa pagina [h]" accesskey="h"><span>Cronologia</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Strumenti pagine"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Strumenti" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Strumenti</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Strumenti</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">nascondi</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Altre opzioni" > <div class="vector-menu-heading"> Azioni </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/DVB-S"><span>Leggi</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=DVB-S&veaction=edit" title="Modifica questa pagina [v]" accesskey="v"><span>Modifica</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=DVB-S&action=edit" title="Modifica il wikitesto di questa pagina [e]" accesskey="e"><span>Modifica wikitesto</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=DVB-S&action=history"><span>Cronologia</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Generale </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Speciale:PuntanoQui/DVB-S" title="Elenco di tutte le pagine che sono collegate a questa [j]" accesskey="j"><span>Puntano qui</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Speciale:ModificheCorrelate/DVB-S" rel="nofollow" title="Elenco delle ultime modifiche alle pagine collegate a questa [k]" accesskey="k"><span>Modifiche correlate</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=DVB-S&oldid=137072774" title="Collegamento permanente a questa versione di questa pagina"><span>Link permanente</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=DVB-S&action=info" title="Ulteriori informazioni su questa pagina"><span>Informazioni pagina</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Speciale:Cita&page=DVB-S&id=137072774&wpFormIdentifier=titleform" title="Informazioni su come citare questa pagina"><span>Cita questa voce</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Speciale:UrlShortener&url=https%3A%2F%2Fit.wikipedia.org%2Fwiki%2FDVB-S"><span>Ottieni URL breve</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Speciale:QrCode&url=https%3A%2F%2Fit.wikipedia.org%2Fwiki%2FDVB-S"><span>Scarica codice QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Stampa/esporta </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Speciale:Libro&bookcmd=book_creator&referer=DVB-S"><span>Crea un libro</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Speciale:DownloadAsPdf&page=DVB-S&action=show-download-screen"><span>Scarica come PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=DVB-S&printable=yes" title="Versione stampabile di questa pagina [p]" accesskey="p"><span>Versione stampabile</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In altri progetti </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:DVB-S" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q384916" title="Collegamento all'elemento connesso dell'archivio dati [g]" accesskey="g"><span>Elemento Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Strumenti pagine"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aspetto"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aspetto</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">nascondi</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Da Wikipedia, l'enciclopedia libera.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><p>In <a href="/wiki/Telecomunicazioni" class="mw-redirect" title="Telecomunicazioni">telecomunicazioni</a> il <b>DVB-S</b>, acronimo di <i>Digital Video Broadcasting - Satellite</i>, è lo <a href="/wiki/Standard_(informatica)" class="mw-redirect" title="Standard (informatica)">standard</a> del consorzio europeo <a href="/wiki/Digital_Video_Broadcasting" title="Digital Video Broadcasting">DVB</a> per una modalità di <a href="/wiki/Trasmissione_(telecomunicazioni)" title="Trasmissione (telecomunicazioni)">trasmissione</a> <a href="/wiki/Satellite_artificiale" title="Satellite artificiale">televisiva satellitare</a>. Il sistema prevede la trasmissione in modalità <a href="/wiki/Broadcast" class="mw-redirect" title="Broadcast">broadcast</a> di un flusso <a href="/wiki/Audio" title="Audio">audio</a>/<a href="/wiki/Video" title="Video">video</a> <a href="/wiki/Trasmissione_digitale" title="Trasmissione digitale">digitale</a> della famiglia <a href="/wiki/MPEG-2" title="MPEG-2">MPEG-2</a>, utilizzando un sistema di <a href="/wiki/Modulazione" title="Modulazione">modulazione</a> QPSK con <a href="/wiki/Codifica_di_canale" title="Codifica di canale">codifica di canale</a> concatenata. È il sistema di trasmissione tipico di chi riceve programmi televisivi da <a href="/wiki/Satellite_per_telecomunicazioni" class="mw-redirect" title="Satellite per telecomunicazioni">satellite</a> attraverso la nota <a href="/wiki/Antenna_parabolica" title="Antenna parabolica">antenna parabolica</a> posta all'esterno dell'edificio ed il <a href="/wiki/Set-top_box" title="Set-top box">decoder</a> satellitare all'interno. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Descrizione_tecnica_del_sistema_di_trasmissione">Descrizione tecnica del sistema di trasmissione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DVB-S&veaction=edit&section=1" title="Modifica la sezione Descrizione tecnica del sistema di trasmissione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=DVB-S&action=edit&section=1" title="Edit section's source code: Descrizione tecnica del sistema di trasmissione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Dvbs_tx_scheme.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Dvbs_tx_scheme.png/400px-Dvbs_tx_scheme.png" decoding="async" width="400" height="226" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Dvbs_tx_scheme.png/600px-Dvbs_tx_scheme.png 1.5x, //upload.wikimedia.org/wikipedia/commons/6/61/Dvbs_tx_scheme.png 2x" data-file-width="728" data-file-height="412" /></a><figcaption>Schema a blocchi di un sistema di trasmissione DVB-S</figcaption></figure> <p>Con riferimento alla figura, descriviamo brevemente le caratteristiche e lo scopo di ciascun blocco di elaborazione. </p> <ul><li><a href="/wiki/Codifica_di_sorgente" title="Codifica di sorgente">Codifica di sorgente</a> e <a href="/wiki/Multiplazione" title="Multiplazione">multiplazione</a> (MUX) MPEG-2: un flusso video, uno audio e uno dati sono multiplati insieme a costituire un flusso di programma MPEG-2 PS (MPEG-2 Programme Stream). Uno o più flussi di programma costituiscono un flusso di trasporto MPEG-2 TS (MPEG-2 Transport Stream); tale flusso rappresenta la sequenza digitale che viene trasmessa e ricevuta nei <a href="/wiki/Set-top_box" title="Set-top box">set-top box</a> (STB) domestici. Il <a href="/wiki/Bit_rate" class="mw-redirect" title="Bit rate">bit rate</a> ammessa per il trasporto MPEG-2 dipende principalmente dalla <a href="/wiki/Larghezza_di_banda" title="Larghezza di banda">larghezza di banda</a> del <a href="/wiki/Transponder" title="Transponder">transponder</a> posto a bordo del satellite: essa può variare da circa 19 a circa 68 <a href="/wiki/Mbps" class="mw-redirect" title="Mbps">Mbps</a> (si veda la figura in fondo per l'elenco completo).</li> <li>Adattamento di MUX e dispersione d'energia: il flusso di trasporto MPEG-2 viene identificato come una sequenza di <a href="/wiki/Pacchetto_(reti)" title="Pacchetto (reti)">pacchetti</a> dati di lunghezza fissa pari a 188 <a href="/wiki/Byte" title="Byte">byte</a>. Con una tecnica chiamata dispersione d'energia (<a href="/wiki/Spread_spectrum" title="Spread spectrum">scrambling</a>), la sequenza di byte viene quindi <a href="/wiki/Correlazione_(statistica)" title="Correlazione (statistica)">non correlata</a>.</li> <li>Codificatore esterno: un primo livello di protezione viene fornito ai dati trasmessi, usando un <a href="/wiki/Codice_a_blocchi" title="Codice a blocchi">codice a blocchi</a> non binario di tipo Reed-Solomon RS(204,188), che permette la correzione di un massimo di 8 byte errati per ogni pacchetto di 188 byte.</li> <li>Interleaver esterno: si utilizza una tecnica di <a href="/wiki/Interleaving" title="Interleaving">interleaving</a> convoluzionale per <i>mescolare</i> la sequenza di dati trasmessa, in modo da renderla più robusta in caso di lunghe sequenze di errori.</li> <li>Codificatore interno: un secondo livello di protezione è affidato all'uso di un codice convoluzionale binario con perforazione, che spesso viene indicato nei set-top box con il termine FEC (<a href="/wiki/Forward_Error_Correction" title="Forward Error Correction">Forward Error Correction</a>). I valori di codifica ammessi sono cinque: 1/2, 2/3, 3/4, 5/6, 7/8.</li> <li>Modulatore QPSK: questo blocco effettua la <a href="/wiki/Modulazione" title="Modulazione">modulazione</a> in banda-base digitale della sequenza di bit, producendo una sequenza di simboli. Il metodo di modulazione utilizzato è <a href="/wiki/Symbol_rate" title="Symbol rate">QPSK</a>.</li> <li>Sagomatura in banda-base: il segnale QPSK è opportunamente filtrato con un <a href="/wiki/Filtro_a_coseno_rialzato" title="Filtro a coseno rialzato">filtro a coseno rialzato</a>, che permette di diminuire le interferenze mutue del segnale in ricezione.</li> <li>DAC e front-end: il segnale digitale viene opportunamente trasformato in un segnale analogico, grazie ad un <a href="/wiki/Convertitore_digitale-analogico" title="Convertitore digitale-analogico">convertitore digitale-analogico</a> (DAC, Digital to Analog Converter), ed infine modulato a frequenza radio (11-12 <a href="/wiki/GHz" class="mw-redirect" title="GHz">GHz</a>) dal front end ad <a href="/wiki/Radiofrequenza" title="Radiofrequenza">RF</a>.</li></ul> <figure class="mw-halign-none" typeof="mw:File/Frame"><a href="/wiki/File:Dvbs_rates.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/9/9f/Dvbs_rates.png" decoding="async" width="408" height="174" class="mw-file-element" data-file-width="408" data-file-height="174" /></a><figcaption>Bit rate disponibili per un sistema DVB-S, assumendo un rapporto tra banda a -3 dB e <a href="/wiki/Symbol_rate" title="Symbol rate">symbol rate</a> pari a 1.28 (modulazione QPSK e coefficiente di roll-off pari a 0.28). I valori espressi in corsivo sono in Mbps.</figcaption></figure> <div class="mw-heading mw-heading2"><h2 id="Descrizione_tecnica_del_sistema_di_ricezione">Descrizione tecnica del sistema di ricezione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DVB-S&veaction=edit&section=2" title="Modifica la sezione Descrizione tecnica del sistema di ricezione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=DVB-S&action=edit&section=2" title="Edit section's source code: Descrizione tecnica del sistema di ricezione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In ricezione, il <a href="/wiki/Set-top_box" title="Set-top box">set-top box</a> contiene tutti i circuiti necessari ad effettuare la demodulazione e la decodifica del segnale ricevuto, utilizzando tecniche duali a quelle descritte per la trasmissione. </p> <ul><li>Front-end e ADC: il segnale analogico ad RF viene portato in banda base e trasformato in un segnale digitale, grazie all'uso di un <a href="/wiki/Convertitore_analogico-digitale" title="Convertitore analogico-digitale">convertitore analogico-digitale</a> (ADC, Analog to Digital Converter).</li> <li>Demodulazione QPSK</li> <li>Decodifica interna: si utilizza l'<i><a href="/wiki/Algoritmo_di_Viterbi" title="Algoritmo di Viterbi">algoritmo di Viterbi</a></i>.</li> <li>Deinterleaving esterno</li> <li>Decodifica esterna</li> <li>Riadattamento di MUX</li> <li>Demultiplazione MPEG-2 e decodifica di sorgente</li></ul> <p>Il <a href="/wiki/Segnale_(fisica)" class="mw-redirect" title="Segnale (fisica)">segnale</a> DVB-S, utilizzando frequenze elettromagnetiche più elevate rispetto alle <a href="/wiki/Telediffusione" title="Telediffusione">telediffusioni</a> terrestri, è soggetto a maggiore interferenza da parte dei disturbi da precipitazioni e la trasmissione diventa altamente disturbata o interrotta in casi di pioggia moderata o forte. </p> <div class="mw-heading mw-heading2"><h2 id="Bibliografia">Bibliografia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DVB-S&veaction=edit&section=3" title="Modifica la sezione Bibliografia" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=DVB-S&action=edit&section=3" title="Edit section's source code: Bibliografia"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>ETSI EN 300 421 V1.1.2 (1997-08), <i>Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 11/12 GHz satellite services</i>, scaricabile dal sito <a rel="nofollow" class="external text" href="http://www.etsi.org">ETSI</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DVB-S&veaction=edit&section=4" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=DVB-S&action=edit&section=4" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/DVB-S2" title="DVB-S2">DVB-S2</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DVB-S&veaction=edit&section=5" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=DVB-S&action=edit&section=5" title="Edit section's source code: Altri progetti"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div id="interProject" class="toccolours" style="display: none; 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cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only mw-watchlink" id="ca-watchstar-sticky-header" tabindex="-1" data-event-name="watch-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-star mw-ui-icon-wikimedia-wikimedia-star"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-ve-edit-sticky-header" tabindex="-1" data-event-name="ve-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-edit mw-ui-icon-wikimedia-wikimedia-edit"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-edit-sticky-header" tabindex="-1" data-event-name="wikitext-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-wikiText mw-ui-icon-wikimedia-wikimedia-wikiText"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-viewsource-sticky-header" tabindex="-1" data-event-name="ve-edit-protected-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-editLock mw-ui-icon-wikimedia-wikimedia-editLock"></span> <span></span> </a> </div> <div class="vector-sticky-header-buttons"> <button class="cdx-button cdx-button--weight-quiet mw-interlanguage-selector" id="p-lang-btn-sticky-header" tabindex="-1" data-event-name="ui.dropdown-p-lang-btn-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>25 lingue</span> </button> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive" id="ca-addsection-sticky-header" tabindex="-1" data-event-name="addsection-sticky-header"><span class="vector-icon mw-ui-icon-speechBubbleAdd-progressive mw-ui-icon-wikimedia-speechBubbleAdd-progressive"></span> <span>Aggiungi argomento</span> </a> </div> <div class="vector-sticky-header-icon-end"> <div class="vector-user-links"> </div> </div> </div> </div> </div> <div class="mw-portlet mw-portlet-dock-bottom emptyPortlet" id="p-dock-bottom"> <ul> </ul> </div> <script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-866f5d587f-f67zp","wgBackendResponseTime":109,"wgPageParseReport":{"limitreport":{"cputime":"0.086","walltime":"0.121","ppvisitednodes":{"value":1963,"limit":1000000},"postexpandincludesize":{"value":3118,"limit":2097152},"templateargumentsize":{"value":157,"limit":2097152},"expansiondepth":{"value":9,"limit":100},"expensivefunctioncount":{"value":2,"limit":500},"unstrip-depth":{"value":0,"limit":20},"unstrip-size":{"value":1708,"limit":5000000},"entityaccesscount":{"value":1,"limit":400},"timingprofile":["100.00% 91.474 1 -total"," 55.48% 50.748 1 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