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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">De Wikipedia, la enciclopedia libre</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="es" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r157776694">.mw-parser-output .infobox .imagen{max-width:100%;margin:0 auto}.mw-parser-output .infobox .imagen img{max-width:100%;height:auto}.mw-parser-output .infobox .mw-kartographer-container .thumbinner,.mw-parser-output .infobox .mw-kartographer-map{box-sizing:border-box;width:100%!important}body.skin-timeless .mw-parser-output .infobox .imagen a.image>img{max-width:100%!important;height:auto!important}</style><table class="infobox" style="width:22.7em; line-height: 1.4em; text-align:left; padding:.23em;"><tbody><tr><th colspan="3" class="cabecera informática" style="text-align:center;background-color:transparent;color:inherit;">H.120</th></tr><tr><th scope="row" style="text-align:left;">Tipo de estándar</th><td colspan="2"> <a href="/wiki/Formato_de_compresi%C3%B3n_de_video" title="Formato de compresión de video">formato de compresión de video</a></td></tr><tr><th scope="row" style="text-align:left;">Primera publicación</th><td colspan="2"> 1984</td></tr><tr><th scope="row" style="text-align:left;">Editorial</th><td colspan="2"> <a href="/wiki/Uni%C3%B3n_Internacional_de_Telecomunicaciones" title="Unión Internacional de Telecomunicaciones">Unión Internacional de Telecomunicaciones</a></td></tr><tr><td class="noprint" colspan="3" style="text-align:left;"><div class="plainlinks wikidata-link" style="font-size: 0.85em">[<a href="https://www.wikidata.org/wiki/Q2416318" class="extiw" title="d:Q2416318">editar datos en Wikidata</a>]</div></td></tr></tbody></table> <p><b>H.120</b> fue el primer <a href="/wiki/Formato_de_compresi%C3%B3n_de_video" title="Formato de compresión de video">formato de compresión de video</a> digital. Fue desarrollado por COST 211 y publicado por el CCITT (ahora <a href="/wiki/ITU-T" class="mw-redirect" title="ITU-T">UIT-T</a>) en 1984, con una revisión en 1988 que incluyó contribuciones propuestas por otras organizaciones. La calidad del video resultante no fue óptima, hubo pocas implementaciones y no hay <a href="/wiki/C%C3%B3dec" title="Códec">códecs</a> existentes para el formato, pero proporcionó un conocimiento importante que condujo directamente a sus sucesores prácticos, como <a href="/wiki/H.261" title="H.261">H.261</a>. La última revisión se publicó en marzo de 1993. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Formato_de_transmisión"><span id="Formato_de_transmisi.C3.B3n"></span>Formato de transmisión</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=H.120&action=edit&section=1" title="Editar sección: Formato de transmisión"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Las transmisiones H.120 corrieron a 1.544 kbit/s para <a href="/wiki/NTSC" title="NTSC">NTSC</a> y 2048 kbit/s para <a href="/wiki/PAL" title="PAL">PAL</a> . La primera versión (1984) contó con reabastecimiento condicional, modulación diferencial de código de pulso (DPCM), <a href="/wiki/Cuantificaci%C3%B3n_digital" title="Cuantificación digital">cuantificación escalar</a>, codificación de longitud variable y un interruptor para <a href="/wiki/Muestreo_digital" class="mw-redirect" title="Muestreo digital">muestreo</a>. La segunda versión (1988) agregó <a href="/wiki/Compensaci%C3%B3n_de_movimiento" title="Compensación de movimiento">compensación de movimiento</a> y predicción de fondo.<sup id="cite_ref-1" class="reference separada"><a href="#cite_note-1"><span class="corchete-llamada">[</span>1<span class="corchete-llamada">]</span></a></sup> En 1993 se publicó una edición final (sin contenido técnico nuevo) como resultado de la creación del <a href="/wiki/ITU-T" class="mw-redirect" title="ITU-T">ITU-T</a> para reemplazar al anterior organismo de normalización del CCITT. </p> <div class="mw-heading mw-heading2"><h2 id="Problemas_y_conocimientos_adquiridos">Problemas y conocimientos adquiridos</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=H.120&action=edit&section=2" title="Editar sección: Problemas y conocimientos adquiridos"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El video codificado con H.120 no tenía una calidad lo suficientemente buena para un uso práctico — tenía una resolución espacial muy buena (ya que el PCM diferencial funciona píxel por píxel), pero una calidad temporal muy baja. A los investigadores les quedó claro que para mejorar la calidad del video sin exceder la tasa de bits objetivo para la transmisión, sería necesario codificar usando un promedio de menos de un bit por cada píxel. Esto requeriría que los grupos de píxeles se codifiquen juntos. Esto llevó a los códecs basados en bloques de <a href="/wiki/Transformada_de_coseno_discreta" title="Transformada de coseno discreta">transformada de coseno discreta</a> (DCT) que siguieron a H.120, como <a href="/wiki/H.261" title="H.261">H.261</a>, el primer estándar práctico de codificación de video. </p> <div class="mw-heading mw-heading2"><h2 id="Referencias">Referencias</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=H.120&action=edit&section=3" title="Editar sección: Referencias"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span id="CITAREFSullivan,_Ph.Djulio_de_2005" class="citation publicación">Sullivan, Ph.D, Gary J. (julio de 2005). <a rel="nofollow" class="external text" href="https://www.itu.int/ITU-T/worksem/vica/docs/presentations/S0_P2_Sullivan.pdf">«Overview of International Video Coding Standards (preceding H.264/AVC)»</a>. <i><a href="/wiki/Uni%C3%B3n_Internacional_de_Telecomunicaciones" title="Unión Internacional de Telecomunicaciones">Unión Internacional de Telecomunicaciones</a></i><span class="reference-accessdate">. Consultado el 23 de septiembre de 2021</span>.</span><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fes.wikipedia.org%3AH.120&rft.atitle=Overview+of+International+Video+Coding+Standards+%28preceding+H.264%2FAVC%29&rft.au=Sullivan%2C+Ph.D%2C+Gary+J.&rft.aufirst=Gary+J.&rft.aulast=Sullivan%2C+Ph.D&rft.date=julio+de+2005&rft.genre=article&rft.jtitle=Uni%C3%B3n+Internacional+de+Telecomunicaciones&rft_id=https%3A%2F%2Fwww.itu.int%2FITU-T%2Fworksem%2Fvica%2Fdocs%2Fpresentations%2FS0_P2_Sullivan.pdf&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> </ol> <div class="mw-heading mw-heading2"><h2 id="Enlaces_externos">Enlaces externos</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=H.120&action=edit&section=4" title="Editar sección: Enlaces externos"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-H.120/en">H.120 : Códecs para videoconferencias que utilizan transmisión de grupo digital primario</a> ( <a href="/wiki/Uni%C3%B3n_Internacional_de_Telecomunicaciones" title="Unión Internacional de Telecomunicaciones">UIT</a> )</li></ul> <style data-mw-deduplicate="TemplateStyles:r161257576">.mw-parser-output .mw-authority-control{margin-top:1.5em}.mw-parser-output .mw-authority-control .navbox table{margin:0}.mw-parser-output .mw-authority-control .navbox hr:last-child{display:none}.mw-parser-output .mw-authority-control .navbox+.mw-mf-linked-projects{display:none}.mw-parser-output .mw-authority-control .mw-mf-linked-projects{display:flex;padding:0.5em;border:1px solid var(--border-color-base,#a2a9b1);background-color:var(--background-color-neutral,#eaecf0);color:var(--color-base,#202122)}.mw-parser-output .mw-authority-control .mw-mf-linked-projects ul li{margin-bottom:0}.mw-parser-output .mw-authority-control .navbox{border:1px solid var(--border-color-base,#a2a9b1);background-color:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .mw-authority-control .navbox-list{border-color:#f8f9fa}.mw-parser-output .mw-authority-control .navbox th{background-color:#eeeeff}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .mw-mf-linked-projects{border:1px solid var(--border-color-base,#72777d);background-color:var(--background-color-neutral,#27292d);color:var(--color-base,#eaecf0)}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .navbox{border:1px solid var(--border-color-base,#72777d)!important;background-color:var(--background-color-neutral-subtle,#202122)!important}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .navbox-list{border-color:#202122!important}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .navbox th{background-color:#27292d!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .mw-mf-linked-projects{border:1px solid var(--border-color-base,#72777d)!important;background-color:var(--background-color-neutral,#27292d)!important;color:var(--color-base,#eaecf0)!important}html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .navbox{border:1px solid var(--border-color-base,#72777d)!important;background-color:var(--background-color-neutral-subtle,#202122)!important}html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .navbox-list{border-color:#202122!important}html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .navbox th{background-color:#27292d!important}}</style><div class="mw-authority-control"><div role="navigation" class="navbox" aria-label="Navbox" style="width: inherit;padding:3px"><table class="hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width: 12%; 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