Égalisation RIAA — Wikipédia

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mw-ui-icon-wikimedia-expand"></span> <span>Afficher / masquer la sous-section Courbe RIAA</span> </button> <ul id="toc-Courbe_RIAA-sublist" class="vector-toc-list"> <li id="toc-Courbe_RIAA_originale" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Courbe_RIAA_originale"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Courbe RIAA originale</span> </div> </a> <ul id="toc-Courbe_RIAA_originale-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Courbe_RIAA/IEC" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Courbe_RIAA/IEC"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Courbe RIAA/IEC</span> </div> </a> <ul id="toc-Courbe_RIAA/IEC-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Notes_et_références" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes_et_références"> 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class="mw-body-header vector-page-titlebar"> <nav aria-label="Sommaire" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <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="Basculer la table des matières" > <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">Basculer la table des matières</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">Égalisation RIAA</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="Aller à un article dans une autre langue. Disponible en 11 langues." > <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-11" 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">11 langues</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/RIAA-betoning" title="RIAA-betoning – danois" lang="da" hreflang="da" data-title="RIAA-betoning" data-language-autonym="Dansk" data-language-local-name="danois" 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/Schneidkennlinie" title="Schneidkennlinie – allemand" lang="de" hreflang="de" data-title="Schneidkennlinie" data-language-autonym="Deutsch" data-language-local-name="allemand" 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/RIAA_equalization" title="RIAA equalization – anglais" lang="en" hreflang="en" data-title="RIAA equalization" data-language-autonym="English" data-language-local-name="anglais" 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/Ecualizaci%C3%B3n_RIAA" title="Ecualización RIAA – espagnol" lang="es" hreflang="es" data-title="Ecualización RIAA" data-language-autonym="Español" data-language-local-name="espagnol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/RIAA-korjain" title="RIAA-korjain – finnois" lang="fi" hreflang="fi" data-title="RIAA-korjain" data-language-autonym="Suomi" data-language-local-name="finnois" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Equalizzazione_RIAA" title="Equalizzazione RIAA – italien" lang="it" hreflang="it" data-title="Equalizzazione RIAA" data-language-autonym="Italiano" data-language-local-name="italien" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/RIAA_Recording_Curve" title="RIAA Recording Curve – néerlandais" lang="nl" hreflang="nl" data-title="RIAA Recording Curve" data-language-autonym="Nederlands" data-language-local-name="néerlandais" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ru badge-Q17437798 badge-goodarticle mw-list-item" title="bon article"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D1%80%D0%B8%D0%B2%D0%B0%D1%8F_RIAA" title="Кривая RIAA – russe" lang="ru" hreflang="ru" data-title="Кривая RIAA" data-language-autonym="Русский" data-language-local-name="russe" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/RIAA_equalization" title="RIAA equalization – Simple English" lang="en-simple" hreflang="en-simple" data-title="RIAA equalization" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/RIAA-steg" title="RIAA-steg – suédois" lang="sv" hreflang="sv" data-title="RIAA-steg" data-language-autonym="Svenska" data-language-local-name="suédois" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9A%D1%80%D0%B8%D0%B2%D0%B0_RIAA" title="Крива RIAA – ukrainien" lang="uk" hreflang="uk" data-title="Крива RIAA" data-language-autonym="Українська" data-language-local-name="ukrainien" class="interlanguage-link-target"><span>Українська</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/Q923115#sitelinks-wikipedia" title="Modifier les liens interlangues" class="wbc-editpage">Modifier les liens</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="Espaces de noms"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet 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<button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">déplacer vers la barre latérale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">masquer</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">Un article de Wikipédia, l'encyclopédie 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="fr" dir="ltr"><div class="bandeau-container metadata bandeau-article bandeau-niveau-ebauche"><div class="bandeau-cell bandeau-icone" style="display:table-cell;padding-right:0.5em"><span style="white-space:nowrap;word-spacing:5px"><span class="noviewer" typeof="mw:File"><a href="/wiki/Fichier:Icons8_flat_electronics.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Icons8_flat_electronics.svg/35px-Icons8_flat_electronics.svg.png" decoding="async" width="35" height="35" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Icons8_flat_electronics.svg/53px-Icons8_flat_electronics.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Icons8_flat_electronics.svg/70px-Icons8_flat_electronics.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span> <span class="noviewer" typeof="mw:File"><a href="/wiki/Fichier:Musical_note_nicu_bucule_01.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/Musical_note_nicu_bucule_01.svg/35px-Musical_note_nicu_bucule_01.svg.png" decoding="async" width="35" height="35" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/Musical_note_nicu_bucule_01.svg/53px-Musical_note_nicu_bucule_01.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/96/Musical_note_nicu_bucule_01.svg/70px-Musical_note_nicu_bucule_01.svg.png 2x" data-file-width="100" data-file-height="100" /></a></span></span></div><div class="bandeau-cell" style="display:table-cell;padding-right:0.5em"> <p><strong class="bandeau-titre">Cet article est une <a href="/wiki/Aide:%C3%89bauche" title="Aide:Ébauche">ébauche</a> concernant l’<a href="/wiki/%C3%89lectronique_(technique)" title="Électronique (technique)">électronique</a> et l’<a href="/wiki/%C3%89dition_musicale" title="Édition musicale">édition musicale</a>.</strong> </p><p>Vous pouvez partager vos connaissances en l’améliorant (<b><a href="/wiki/Aide:Comment_modifier_une_page" title="Aide:Comment modifier une page">comment ?</a></b>) selon les recommandations des <a href="/wiki/Projet:Accueil" title="Projet:Accueil">projets correspondants</a>. </p> </div></div> <figure typeof="mw:File/Thumb"><a href="/wiki/Fichier:RIAA-EQ-Curve_rec_play.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/86/RIAA-EQ-Curve_rec_play.svg/250px-RIAA-EQ-Curve_rec_play.svg.png" decoding="async" width="250" height="151" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/86/RIAA-EQ-Curve_rec_play.svg/375px-RIAA-EQ-Curve_rec_play.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/86/RIAA-EQ-Curve_rec_play.svg/500px-RIAA-EQ-Curve_rec_play.svg.png 2x" data-file-width="615" data-file-height="371" /></a><figcaption>Courbe d'égalisation RIAA (à la lecture / à l'enregistrement)</figcaption></figure> <p>L'<b>égalisation RIAA</b> (ou correction RIAA) est la spécification de lecture/enregistrement de disques microsillons en vinyle standard, établie par la <a href="/wiki/Recording_Industry_Association_of_America" title="Recording Industry Association of America">Recording Industry Association of America</a> (RIAA) et utilisée progressivement à partir de 1954 dans la fabrication des disques microsillons. Auparavant, de nombreuses normes différentes co-existaient . La norme RIAA permet d’atténuer les basses fréquences d'un son avant sa gravure sur <a href="/wiki/Disque_microsillon" title="Disque microsillon">disque microsillon</a> et de les restituer au moment de la lecture du disque selon une même courbe inversée (dite « correction RIAA » ou « normalisation RIAA »). </p><p>Sans correction au moment de l'enregistrement, le burin graveur effectue des mouvements de grande ampleur pour inscrire les basses fréquences sur le disque ce qui a plusieurs inconvénients (difficulté physique pour le stylet de suivre précisément le mouvement imposé par les fréquences ce qui crée de la distorsion, occupation d'une place importante sur le disque réduisant la durée d'enregistrement possible)<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite_crochet">[</span>1<span class="cite_crochet">]</span></a></sup>. </p><p>Les fréquences sont restituées lors de la lecture sur une platine vinyle grâce à un <a href="/wiki/Circuit_%C3%A9lectronique" title="Circuit électronique">circuit électronique</a> spécialement conçu pour cet usage situé entre la platine et l'amplificateur par exemple à l'aide d'une D.I. conçue à cet effet ou d'un amplificateur « phono » incluant la correction RIAA qui permet de restituer les fréquences atténuées. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Courbe_RIAA">Courbe RIAA</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89galisation_RIAA&veaction=edit&section=1" title="Modifier la section : Courbe RIAA" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89galisation_RIAA&action=edit&section=1" title="Modifier le code source de la section : Courbe RIAA"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Courbe_RIAA_originale">Courbe RIAA originale</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89galisation_RIAA&veaction=edit&section=2" title="Modifier la section : Courbe RIAA originale" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89galisation_RIAA&action=edit&section=2" title="Modifier le code source de la section : Courbe RIAA originale"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La <a href="/wiki/Recording_Industry_Association_of_America" title="Recording Industry Association of America">Recording Industry Association of America</a> a standardisé la courbe d'égalisation en 1954, remplaçant l'ensemble des autres courbes utilisées. La courbe RIAA (ou <i>RIAA Reproduction Curve</i>) s'obtient à l'aide de la formule suivante : <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle dB=10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{2}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{1}^{2}}}\right)-10\log _{10}\left(1+4\pi ^{2}f^{2}t_{3}^{2}\right)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>d</mi> <mi>B</mi> <mo>=</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mrow> <mn>4</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> </mfrac> </mrow> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mrow> <mn>4</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> </mfrac> </mrow> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mn>4</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> <mo>)</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle dB=10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{2}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{1}^{2}}}\right)-10\log _{10}\left(1+4\pi ^{2}f^{2}t_{3}^{2}\right)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/398f7f5ca1191983dfd1abceb6daaa5990b1c8a1" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:81.071ex; height:7.509ex;" alt="{\displaystyle dB=10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{2}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{1}^{2}}}\right)-10\log _{10}\left(1+4\pi ^{2}f^{2}t_{3}^{2}\right)}"></span> où <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>f</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle f}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/132e57acb643253e7810ee9702d9581f159a1c61" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.279ex; height:2.509ex;" alt="{\displaystyle f}"></span> est la fréquence, <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t_{1}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t_{1}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/cb0768c0bd659f2f84fb5ef9f4b74f336123d915" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.894ex; height:2.343ex;" alt="{\displaystyle t_{1}}"></span> la constante de temps des graves (3 180 <abbr class="abbr" title="microseconde">μs</abbr>), <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t_{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t_{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/749fee708b41e7079eabd50d61c8bf3e965db16f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.894ex; height:2.343ex;" alt="{\displaystyle t_{2}}"></span> la constante de temps des médiums (318 <abbr class="abbr" title="microseconde">μs</abbr>) et <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t_{3}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t_{3}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c62226a0dd66a3f9ad5706a365227331d9acb3a5" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.894ex; height:2.343ex;" alt="{\displaystyle t_{3}}"></span>la <a href="/wiki/Constante_de_temps" title="Constante de temps">constante de temps</a> des aigus (75 <abbr class="abbr" title="microseconde">μs</abbr>). </p> <div class="mw-heading mw-heading3"><h3 id="Courbe_RIAA/IEC"><span id="Courbe_RIAA.2FIEC"></span>Courbe RIAA/IEC</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89galisation_RIAA&veaction=edit&section=3" title="Modifier la section : Courbe RIAA/IEC" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89galisation_RIAA&action=edit&section=3" title="Modifier le code source de la section : Courbe RIAA/IEC"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>En <a href="/wiki/1970" title="1970">1970</a>, la <a href="/wiki/Commission_%C3%A9lectrotechnique_internationale" title="Commission électrotechnique internationale">Commission électrotechnique internationale</a> (CEI) a proposé la courbe RIAA/IEC, une nouvelle version de la courbe de reproduction RIAA à laquelle une constante de temps supplémentaire qui modifie les sons très graves a été ajoutée : </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle dB=10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{2}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{1}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{4}^{2}}}\right)-10\log _{10}\left(1+4\pi ^{2}f^{2}t_{3}^{2}\right)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>d</mi> <mi>B</mi> <mo>=</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mrow> <mn>4</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> </mfrac> </mrow> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mrow> <mn>4</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> </mfrac> </mrow> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mrow> <mn>4</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> </mfrac> </mrow> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mn>4</mn> <msup> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msup> <mi>f</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msubsup> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> </mrow> <mo>)</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle dB=10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{2}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{1}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{4}^{2}}}\right)-10\log _{10}\left(1+4\pi ^{2}f^{2}t_{3}^{2}\right)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/6181c299f9ed04ec969d0408b2fcb65ff5571e6b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:107.811ex; height:7.509ex;" alt="{\displaystyle dB=10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{2}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{1}^{2}}}\right)-10\log _{10}\left(1+{\frac {1}{4\pi ^{2}f^{2}t_{4}^{2}}}\right)-10\log _{10}\left(1+4\pi ^{2}f^{2}t_{3}^{2}\right)}"></span> où <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t_{4}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t_{4}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/733c1c9afebab516de6c89491b05d5478767b820" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.894ex; height:2.343ex;" alt="{\displaystyle t_{4}}"></span> est la constante de temps des très graves (7 950 <abbr class="abbr" title="microseconde">μs</abbr>). Elle n'a toutefois connu que peu de succès et la courbe RIAA originale reste à ce jour plus utilisée. </p> <div class="mw-heading mw-heading2"><h2 id="Notes_et_références"><span id="Notes_et_r.C3.A9f.C3.A9rences"></span>Notes et références</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89galisation_RIAA&veaction=edit&section=4" title="Modifier la section : Notes et références" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89galisation_RIAA&action=edit&section=4" title="Modifier le code source de la section : Notes et références"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="references-small decimal" style=""><div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink noprint"><a href="#cite_ref-1">↑</a> </span><span class="reference-text"><span class="ouvrage" id="Vinzio2010-2011"><span class="ouvrage" id="Maxime_Vinzio2010-2011">Maxime Vinzio, « <cite style="font-style:normal">Les disques vinyles et la restitution du son</cite> », <i>TIPE</i>,‎ 2010-2011, <abbr class="abbr" title="pages">p.</abbr> <span class="nowrap">7-8</span> <small style="line-height:1em;">(<a rel="nofollow" class="external text" href="http://jeanluc.rigal.free.fr/files/principe-disque-vynil.pdf">lire en ligne</a>)</small><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Les+disques+vinyles+et+la+restitution+du+son&rft.jtitle=TIPE&rft.aulast=Vinzio&rft.aufirst=Maxime&rft.date=2011&rft.pages=7-8&rfr_id=info%3Asid%2Ffr.wikipedia.org%3A%C3%89galisation+RIAA"></span></span></span>.</span> </li> </ol></div> </div> <div class="mw-heading mw-heading2"><h2 id="Article_connexe">Article connexe</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89galisation_RIAA&veaction=edit&section=5" title="Modifier la section : Article connexe" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89galisation_RIAA&action=edit&section=5" title="Modifier le code source de la section : Article connexe"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Pr%C3%A9amplificateur" title="Préamplificateur">Préamplificateur</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Lien_externe">Lien externe</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%89galisation_RIAA&veaction=edit&section=6" title="Modifier la section : Lien externe" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%89galisation_RIAA&action=edit&section=6" title="Modifier le code source de la section : Lien externe"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><abbr class="abbr indicateur-langue" title="Langue : français">(fr)</abbr> <a rel="nofollow" class="external text" href="http://www.sonelec-musique.com/electronique_realisations_correcteur_riaa_inverse_002.html">Schéma électronique d'un correcteur RIAA inverse</a></li></ul> <p><br /> </p> <ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer skin-invert-image" typeof="mw:File"><a href="/wiki/Portail:Musique" title="Portail de la musique"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Musical_notes.svg/32px-Musical_notes.svg.png" decoding="async" width="32" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Musical_notes.svg/48px-Musical_notes.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Musical_notes.svg/64px-Musical_notes.svg.png 2x" data-file-width="400" data-file-height="300" /></a></span></span> <span class="bandeau-portail-texte"><a href="/wiki/Portail:Musique" title="Portail:Musique">Portail de la musique</a></span> </span></li> <li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer skin-invert-image" typeof="mw:File"><a href="/wiki/Portail:%C3%89lectricit%C3%A9_et_%C3%A9lectronique" title="Portail de l’électricité et de l’électronique"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Octicons-circuit-board.svg/24px-Octicons-circuit-board.svg.png" decoding="async" width="24" height="24" class="mw-file-element" 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Égalisation RIAA — Wikipédia