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<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-Generalità" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Generalità"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Generalità</span> </div> </a> <ul id="toc-Generalità-sublist" class="vector-toc-list"> </ul> </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">2</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-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 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</div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">DVB-S2</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 13 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-13" 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">13 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_dvb-s2" title="معيار dvb-s2 - arabo" lang="ar" hreflang="ar" data-title="معيار dvb-s2" 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-S2" title="DVB-S2 - catalano" lang="ca" hreflang="ca" data-title="DVB-S2" 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-S2" title="DVB-S2 - ceco" lang="cs" hreflang="cs" data-title="DVB-S2" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de badge-Q70894304 mw-list-item" title=""><a href="https://de.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - tedesco" lang="de" hreflang="de" data-title="DVB-S2" 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-S2" title="DVB-S2 - inglese" lang="en" hreflang="en" data-title="DVB-S2" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - spagnolo" lang="es" hreflang="es" data-title="DVB-S2" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fi badge-Q70893996 mw-list-item" title=""><a href="https://fi.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - finlandese" lang="fi" hreflang="fi" data-title="DVB-S2" 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-S2" title="DVB-S2 - francese" lang="fr" hreflang="fr" data-title="DVB-S2" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - russo" lang="ru" hreflang="ru" data-title="DVB-S2" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - ucraino" lang="uk" hreflang="uk" data-title="DVB-S2" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vec mw-list-item"><a href="https://vec.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - veneto" lang="vec" hreflang="vec" data-title="DVB-S2" data-language-autonym="Vèneto" data-language-local-name="veneto" class="interlanguage-link-target"><span>Vèneto</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - vietnamita" lang="vi" hreflang="vi" data-title="DVB-S2" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh badge-Q70894304 mw-list-item" title=""><a href="https://zh.wikipedia.org/wiki/DVB-S2" title="DVB-S2 - cinese" lang="zh" hreflang="zh" data-title="DVB-S2" 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/Q2632863#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-S2" title="Vedi la voce [c]" accesskey="c"><span>Voce</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Discussione:DVB-S2&action=edit&redlink=1" rel="discussion" class="new" title="Vedi le discussioni relative a questa pagina (la pagina non esiste) [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-S2"><span>Leggi</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=DVB-S2&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-S2&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-S2&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-S2"><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-S2&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-S2&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-S2&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-S2" 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-S2" rel="nofollow" title="Elenco delle ultime modifiche alle pagine collegate a questa [k]" accesskey="k"><span>Modifiche correlate</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Speciale:PagineSpeciali" title="Elenco di tutte le pagine speciali [q]" accesskey="q"><span>Pagine speciali</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=DVB-S2&oldid=129241609" 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-S2&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-S2&id=129241609&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%2Fw%2Findex.php%3Ftitle%3DDVB-S2%26section%3D3%26veaction%3Dedit"><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%2Fw%2Findex.php%3Ftitle%3DDVB-S2%26section%3D3%26veaction%3Dedit"><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-S2"><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-S2&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-S2&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-S2" 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/Q2632863" 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-S2</b>, acronimo di <i>Digital Video Broadcasting - Satellite 2° generation</i>, è lo <a href="/wiki/Standard_(informatica)" class="mw-redirect" title="Standard (informatica)">standard</a> successore del <a href="/wiki/DVB-S" title="DVB-S">DVB-S</a> del consorzio europeo <a href="/wiki/Digital_Video_Broadcasting" title="Digital Video Broadcasting">DVB Project</a> per la <a href="/wiki/Televisione_digitale_satellitare" class="mw-redirect" title="Televisione digitale satellitare">televisione digitale satellitare</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Generalità"><span id="Generalit.C3.A0"></span>Generalità</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DVB-S2&veaction=edit&section=1" title="Modifica la sezione Generalità" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=DVB-S2&action=edit&section=1" title="Edit section's source code: Generalità"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Il sistema prevede la <a href="/wiki/Trasmissione_(telecomunicazioni)" title="Trasmissione (telecomunicazioni)">trasmissione</a> di uno o più flussi <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 o MAPSK, con <a href="/wiki/Codifica_di_canale" title="Codifica di canale">codifica di canale</a> concatenata. </p><p>Esso è stato sviluppato sulla base del sistema <a href="/wiki/DVB-S" title="DVB-S">DVB-S</a>, attualmente in uso per il <a href="/wiki/Broadcasting" title="Broadcasting">broadcasting</a> satellitare, e del sistema DVB-DSNG, utilizzato dagli studi mobili per inviare i contributi in collegamento esterno. Le principali novità introdotte, rispetto agli standard esistenti, risiedono nella capacità di variare i parametri di <a href="/wiki/Forward_Error_Correction" title="Forward Error Correction">codifica</a> e di <a href="/wiki/Modulazione" title="Modulazione">modulazione</a> (VCM, <i>Variable Coding and Modulation</i>) ad ogni trama, e nella possibilità di rendere adattativo il cambiamento di tali parametri (ACM, <i>Adaptive Coding and Modulation</i>), sulla base delle informazioni raccolte dal canale di ritorno di ogni singolo utente. </p><p>Verrà utilizzato per tre scopi principali: </p> <ul><li>Trasmissione televisiva broadcast (BS, <i>Broadcast Services</i>) a livello <a href="/wiki/SDTV" title="SDTV">SDTV</a> o <a href="/wiki/HDTV" title="HDTV">HDTV</a>. In tal caso, la trasmissione può essere resa compatibile con il precedente standard DVB-S (BC-BS, <i>Backwards-Compatible BS</i>) o meno (NBC-BS);</li> <li>Servizi interattivi con accesso ad <a href="/wiki/Internet" title="Internet">Internet</a> per le applicazioni d'utente. L'<a href="/wiki/Interattivit%C3%A0" title="Interattività">interattività</a> può avvenire con un canale di ritorno terrestre, quale la linea telefonica, o tramite il satellite stesso (<a href="/wiki/DVB-RCS" title="DVB-RCS">DVB-RCS</a>).</li> <li>Applicazioni professionali, quali invio di contributi e collegamenti in diretta da remoto, distribuzione televisiva a trasmettitori <a href="/wiki/VHF" class="mw-redirect" title="VHF">VHF</a>/<a href="/wiki/Ultra_high_frequency" title="Ultra high frequency">UHF</a> terrestri, distribuzione dati e dorsali Internet. Ovviamente, queste trasmissioni non sono destinate al pubblico generale, ma devono essere intese come brevi trasmissioni effettuate da terminali d'uplink mobili o portatili, indirizzate ad un centro di raccolta.</li></ul> <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-S2&veaction=edit&section=2" 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-S2&action=edit&section=2" 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:Dvbs2_tx_scheme.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Dvbs2_tx_scheme.png/440px-Dvbs2_tx_scheme.png" decoding="async" width="440" height="255" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Dvbs2_tx_scheme.png/660px-Dvbs2_tx_scheme.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Dvbs2_tx_scheme.png/880px-Dvbs2_tx_scheme.png 2x" data-file-width="1017" data-file-height="590" /></a><figcaption>Schema a blocchi di un sistema di trasmissione DVB-S2.</figcaption></figure> <p>Con riferimento alla figura, descriviamo brevemente le caratteristiche e lo scopo di ciascun blocco di elaborazione. </p> <ul><li>Sorgente: uno o più flussi di trasporto MPEG-2 (MPEG-2 TS, <i>MPEG-2 Transport Stream</i>).</li> <li>Adattamento di modo: questo blocco è fortemente influenzato dall'applicazione che utilizza il sistema per la trasmissione dei propri dati. Esso fornisce, in generale: <ul><li>interfacciamento ai flussi in ingresso (possono essere più di uno)</li> <li>sincronizzazione per la tecnica ACM e cancellazione dei pacchetti nulli del Transport Stream</li> <li>codifica <a href="/wiki/Cyclic_redundancy_check" title="Cyclic redundancy check">CRC-8</a>, per la segnalazione di errori al ricevitore, in caso di trasmissione di flussi pacchettizzati</li> <li>fusione dei singoli flussi e suddivisione in blocchi per la <a href="/wiki/Forward_Error_Correction" title="Forward Error Correction">codifica a correzione d'errore</a> (DF, <i>Data Fields</i>)</li> <li>aggiunta di una intestazione detta di <i>banda-base</i>, contenente informazioni sul formato dei flussi in ingresso e sul tipo di adattatività utilizzato.</li></ul></li> <li>Adattamento di flusso: i dati vengono allineati a formare delle trame dette di <i>banda-base</i>, e si attua una prima operazione di <a href="/wiki/CDMA" class="mw-redirect" title="CDMA">scrambling</a> sui dati binari.</li> <li>Codifica FEC: si adotta una tecnica concatenata, con un codice esterno di tipo BCH ed un codice interno di tipo LDPC. La singola trama FEC può essere lunga 64800 (<i>normal</i>, normale) o 16200 (<i>short</i>, breve) bit. Se si usa VCM o ACM, ogni trama può essere di lunghezza differente, e il segnale trasmesso può contenere una combinazione di trame normali o brevi. I valori di codifica ammessi sono undici: 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9 e 9/10. Infine, l'<a href="/wiki/Interleaving" title="Interleaving">interleaving</a> sui bit viene effettuato per le trasmissioni con modulazione 8, 16, o 32APSK.</li> <li>Mappatura: le trame FEC vengono mappate sulla costellazione scelta, che può essere QPSK, 8PSK, 16APSK, o 32APSK.</li> <li>Trama allo strato fisico: si inseriscono delle trame "finte", quando non vi sono dati disponibili da trasmettere, una intestazione detta di <i>strato fisico</i>, dei segnali pilota (opzionali, si usano per migliorare il funzionamento della tecnica ACM), ed infine ancora uno scrambling (stavolta operante non su segnali binari, ma su segnali reali).</li> <li>Modulazione: il segnale 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 (fattori di roll-off pari a 0.35, 0.25 e 0.20). Infine, il segnale digitale viene 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), e modulato a frequenza radio dal front end ad <a href="/wiki/Radiofrequenza" title="Radiofrequenza">RF</a>.</li></ul> <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-S2&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-S2&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 TR 102 376 V1.1.1 (2005-02), <i>Digital Video Broadcasting (DVB): User guidelines for the second generation system for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications (DVB-S2)</i>, scaricabile dal sito <a rel="nofollow" class="external text" href="http://www.etsi.org">ETSI</a></li> <li>ETSI EN 302 307 V1.1.1 (2005-03), <i>Digital Video Broadcasting (DVB); Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications</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-S2&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-S2&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-S" title="DVB-S">DVB-S</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-S2&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-S2&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; clear: both; margin-top: 2em"><p id="sisterProjects" style="background-color: #efefef; color: black; font-weight: bold; margin: 0"><span>Altri progetti</span></p><ul title="Collegamenti verso gli altri progetti Wikimedia"> <li class="" title=""><span class="plainlinks" title="commons:Category:DVB-S2"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:DVB-S2?uselang=it">Wikimedia Commons</a></span></li></ul></div> <ul><li><span typeof="mw:File"><a href="https://commons.wikimedia.org/wiki/?uselang=it" title="Collabora a Wikimedia Commons"><img alt="Collabora a Wikimedia Commons" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png" decoding="async" width="18" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/27px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/36px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/?uselang=it">Wikimedia Commons</a></span> contiene immagini o altri file su <b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:DVB-S2?uselang=it">DVB-S2</a></span></b></li></ul> <div class="noprint" style="width:100%; 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