{"id":124538,"date":"2018-09-12T17:42:58","date_gmt":"2018-09-12T15:42:58","guid":{"rendered":"https:\/\/www.orosound.com\/?p=124538"},"modified":"2023-10-17T11:17:43","modified_gmt":"2023-10-17T09:17:43","slug":"controle-actif-du-bruit","status":"publish","type":"post","link":"https:\/\/www.orosound.com\/fr\/controle-actif-du-bruit\/","title":{"rendered":"Qu\u2019est-ce que le Contr\u00f4le Actif du Bruit ?"},"content":{"rendered":"

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Contr\u00f4le Actif du Bruit :
principes de base de la technologie \u00ab\u00a0ANC\u00a0\u00bb.<\/h1>\n

–
\u2713\u00a0 <\/b>L’histoire du Contr\u00f4le Actif du Bruit
<\/b>\u2713\u00a0 <\/b>Fonctionnement de la technologie ANC
<\/b>\u2713\u00a0 <\/b>Anti-bruit actif : quels d\u00e9fis pour les acousticiens ?
<\/b>\u2713\u00a0 <\/b>Applications courantes<\/p>\n

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Dans la rue, les transports, \u00e0 la maison ou au travail, le bruit s\u2019invite constamment dans nos vies. Les technologies de Contr\u00f4le Actif du Bruit veulent ramener un peu de calme dans ce monde bruyant. Mais comment fonctionnent-elles exactement ?<\/p>\n

 <\/p>\n

L\u2019histoire du Contr\u00f4le Actif du Bruit<\/h2>\n
\n

Le tout premier brevet sur la r\u00e9duction active du bruit est attribu\u00e9 \u00e0 l\u2019ing\u00e9nieur allemand Paul Lueg dans les ann\u00e9es 1930 pour sa technologie d\u2019annulation d\u2019ondes planes dans les tuyaux. C\u2019est \u00e0 lui que l\u2019on doit le concept d\u2019annulation par opposition de phase, qui fonctionne particuli\u00e8rement bien dans les conduits de ventilation.<\/p>\n

\n

Ce proc\u00e9d\u00e9 valable pour les ondes planes n\u2019\u00e9tait alors pas applicable aux environnements acoustiques plus complexes et moins pr\u00e9dictibles.<\/p>\n<\/blockquote>\n

La r\u00e9duction active de bruit appliqu\u00e9e \u00e0 ce type d\u2019environnement est d\u00e9pos\u00e9e dans les ann\u00e9es 1980 par les Fran\u00e7ais Christian Carme et Alain Roure, respectivement docteur et ing\u00e9nieur de recherche au\u00a0CNRS<\/a>.<\/p>\n

 <\/p>\n

Fonctionnement de la technologie \u00ab\u00a0ANC\u00a0\u00bb
<\/b><\/h2>\n
\n
\n

Le bruit est une fluctuation d\u2019ondes de pression. Pour bloquer ces ondes de pression et retrouver le calme, deux solutions existent : l\u2019isolation passive et l\u2019annulation active de bruit.<\/p>\n<\/blockquote>\n

Concr\u00e8tement,\u00a0l\u2019isolation passive consiste \u00e0 utiliser un mat\u00e9riau pour isoler l\u2019oreille de la source du bruit.<\/strong>\u00a0L\u2019exemple le plus connu \u00e9tant les boules Quies. Cette m\u00e9thode permet de bloquer essentiellement les fr\u00e9quences les plus aigu\u00ebs.<\/p>\n

\"contr\u00f4le<\/p>\n

L\u2019annulation active de bruit, de son c\u00f4t\u00e9, est un proc\u00e9d\u00e9 qui utilise la g\u00e9n\u00e9ration d\u2019un \u00ab contre-bruit \u00bb pour cr\u00e9er du silence.<\/strong> Ce \u00ab contre-bruit \u00bb est de m\u00eame amplitude et en opposition de phase avec le bruit ind\u00e9sirable, de sorte que les deux signaux s\u2019additionnent et s\u2019annulent mutuellement. L\u2019annulation active vient en compl\u00e9ment de l\u2019isolation passive et permet une annulation sur tout le spectre audio.\u00a0Cette annulation active de bruit permet de r\u00e9aliser une att\u00e9nuation fixe efficace, qui r\u00e9duit tous les types de bruits de la m\u00eame mani\u00e8re.<\/strong>\u00a0Dans la pratique, on n\u2019obtient jamais un silence total, mais certaines r\u00e9ductions de bruit s\u2019en rapprochent fortement.<\/p>\n

 <\/p>\n

Anti-bruit actif : quel d\u00e9fi pour les acousticiens ?<\/b><\/h2>\n
\n

D\u00e9velopper de l\u2019anti-bruit actif para\u00eet simple, mais dans les faits, cela repr\u00e9sente un r\u00e9el d\u00e9fi pour les experts en acoustique, qui doivent synchroniser toute une cha\u00eene de composants pour trouver le parfait \u00e9quilibre.<\/strong><\/p>\n

En amont de la cha\u00eene, un microphone transforme le signal acoustique (le bruit) en un signal \u00e9lectronique analogique.<\/strong>\u00a0Ce signal est ensuite converti en signal num\u00e9rique par un ADC. Une s\u00e9rie de filtres est alors appliqu\u00e9e \u00e0 ce signal, bit par bit, de fa\u00e7on \u00e0 cr\u00e9er le \u00ab contre-bruit \u00bb du signal per\u00e7u.\u00a0Ce \u00ab contre-bruit \u00bb doit alors tenir compte des r\u00e9ponses propres \u00e0 chacun des \u00e9l\u00e9ments de la cha\u00eene.<\/strong>\u00a0C\u2019est-\u00e0-dire qu\u2019il ne reproduit pas toutes les fr\u00e9quences de la m\u00eame mani\u00e8re, et ces caract\u00e9ristiques doivent \u00eatre prises en compte dans le design du filtre num\u00e9rique.<\/p>\n

\n

Par ailleurs, lorsque le signal acoustique g\u00e9n\u00e9r\u00e9 par le haut-parleur se propage au sein des \u00e9couteurs et du conduit auditif, il est modifi\u00e9. Cette modification est connue par mod\u00e9lisation tridimensionnelle des \u00e9l\u00e9ments m\u00e9caniques et de l\u2019oreille, et est compens\u00e9e par le filtrage num\u00e9rique.<\/p>\n<\/blockquote>\n

Un traitement de ce type est alors caract\u00e9ris\u00e9 de \u00ab feedforward \u00bb<\/strong>\u00a0car le bruit est mesur\u00e9 par le microphone en amont de la cha\u00eene de traitement. Une autre typologie est \u00e9galement couramment utilis\u00e9e, o\u00f9 le microphone est plac\u00e9 en aval, c\u2019est-\u00e0-dire devant le haut-parleur pour capter la somme du bruit et du \u00ab contre-bruit \u00bb.\u00a0Le traitement appliqu\u00e9, dit alors \u00ab feedback \u00bb<\/strong>\u00a0tend alors \u00e0 minimiser cette somme dans une boucle de r\u00e9troaction infinie. La combinaison des typologies \u00ab feedforward \u00bb et \u00ab feedback \u00bb est dite \u00ab hybride \u00bb.<\/p>\n

 <\/p>\n

Contr\u00f4le Actif du Bruit : quelles applications au quotidien ?<\/b><\/h2>\n
\n

L\u2019application la plus courante du Contr\u00f4le Actif de Bruit est le d\u00e9veloppement d\u2019\u00e9couteurs anti-bruit.<\/strong> Essentiellement \u00e0 destination d’utilisateurs finaux, ils permettent d\u2019effectuer tous types d’activit\u00e9s sans souffrir du bruit ambiant, et de profiter ainsi d\u2019un son pur sans pousser le volume \u00e0 un niveau dommageable pour l\u2019oreille.<\/p>\n

\"\"<\/p>\n

Les casque anti-bruit actif sont \u00e9galement utilis\u00e9s de mani\u00e8re croissante par les professionnels <\/strong>en t\u00e9l\u00e9travail<\/a>, souffrant du bruit en open-space<\/a> ou concern\u00e9s par des activit\u00e9s de t\u00e9l\u00e9phonie intensive<\/a>. Ils permettent de s\u2019isoler du bruit afin d\u2019am\u00e9liorer la concentration et le bien-\u00eatre au travail. Des casques anti-bruit professionnels comme ceux de la gamme TILDE\u00ae<\/a> proposent ainsi du Contr\u00f4le Actif du Bruit S\u00e9lectif, dans le but de conserver la collaboration quel que soit l’environnement de travail.<\/p>\n

Finalement,\u00a0le Contr\u00f4le Actif de Bruit suscite un int\u00e9r\u00eat important aupr\u00e8s des constructeurs automobiles<\/strong>\u00a0avec l\u2019application de cette technologie dans les \u00e9chappements de v\u00e9hicules. Elle a \u00e9galement trouv\u00e9 des applications dans la r\u00e9duction du bruit dans les gaines de ventilation et dans les a\u00e9ronefs.<\/p>\n

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D\u00e9couvrez les casques anti-bruit TILDE\u00ae VOICE FIRST<\/h2>\n

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\"\"<\/h3>\n

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Fabriqu\u00e9 en Bretagne, TILDE\u00ae PRO<\/a> est particuli\u00e8rement adapt\u00e9 aux activit\u00e9s de t\u00e9l\u00e9phonie intensive. <\/strong><\/p>\n

\u2713 Micro bouche de\u0301tachable
\u2713 T\u00e9l\u00e9phonie confidentielle et ultra-intelligible
\u2713 Conversations sans bruit en face-\u00e0-face
\u2713 R\u00e9duction active de bruit jusqu\u2019\u00e0 -30dB
\u2713 Connexion Bluetooth 5.0, USB-audio et Jack en option
\u2713 Audio HD (haut-parleurs 40mm)<\/p>\n

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\"\"<\/h2>\n

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Con\u00e7u \u00e0 Paris, TILDE\u00ae AIR<\/a> est un produit ultra-l\u00e9ger, parfait pour se concentrer o\u00f9 que l’on travaille.<\/strong><\/p>\n

\u2713 Design ultra-l\u00e9ger (40 g) et flexible
\u2713 T\u00e9l\u00e9phonie sans fil (Bluetooth)
\u2713 Conversations sans bruit en face-\u00e0-face
\u2713 R\u00e9duction active de bruit jusqu\u2019\u00e0 -30dB
\u2713 Multi appairage Bluetooth 4.2
\u2713 Audio HD (haut-parleurs \u00e0 armature \u00e9quilibr\u00e9e)<\/p>\n

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RESTEZ INFORM\u00c9(E)<\/h2>\n

Ne passez pas \u00e0 c\u00f4t\u00e9 de nos actualit\u00e9s, offres promotionnelles, ou informations exclusives sur les produits TILDE\u00ae.<\/p>\n

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Contr\u00f4le Actif du Bruit :principes de base de la technologie \u00ab\u00a0ANC\u00a0\u00bb. -\u2713\u00a0 L’histoire du Contr\u00f4le Actif du Bruit\u2713\u00a0 Fonctionnement de la technologie ANC\u2713\u00a0 Anti-bruit actif : quels d\u00e9fis pour les acousticiens ?\u2713\u00a0 Applications courantesDans la rue, les transports, \u00e0 la maison ou au travail, le bruit s\u2019invite constamment dans nos vies. Les technologies de Contr\u00f4le […]<\/p>\n","protected":false},"author":2,"featured_media":124544,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Contr\u00f4le Actif du Bruit : technologie et applications","_seopress_titles_desc":"D\u00e9couvrez le fonctionnement du Contr\u00f4le Actif du Bruit -ou r\u00e9duction active- avec l'expert Orosound, et ses multiples champs d'applications.","_seopress_robots_index":"","_seopress_analysis_target_kw":"Contr\u00f4le Actif du Bruit","_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[258],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/posts\/124538"}],"collection":[{"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/comments?post=124538"}],"version-history":[{"count":4,"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/posts\/124538\/revisions"}],"predecessor-version":[{"id":135499,"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/posts\/124538\/revisions\/135499"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/media\/124544"}],"wp:attachment":[{"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/media?parent=124538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/categories?post=124538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.orosound.com\/fr\/wp-json\/wp\/v2\/tags?post=124538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}