{"id":1654,"date":"2015-12-02T17:23:58","date_gmt":"2015-12-02T17:23:58","guid":{"rendered":"https:\/\/www.moderco.com\/?p=1654&lang=fr"},"modified":"2025-11-06T13:17:26","modified_gmt":"2025-11-06T13:17:26","slug":"cts-et-les-attentes-acoustiques","status":"publish","type":"post","link":"https:\/\/www.moderco.com\/fr\/cts-et-les-attentes-acoustiques\/","title":{"rendered":"CTS et les attentes acoustiques"},"content":{"rendered":"

La cloison est install\u00e9e par un distributeur <\/span>accr\u00e9dit\u00e9<\/span> par <\/span>le <\/span>fabricant et <\/span>l\u00e0, <\/span>vous vous dites; <\/span>tout va bien<\/span>.<\/span>\u00a0<\/span>\u00a0<\/span>S<\/span>oudain<\/span>ement<\/span> le t\u00e9l\u00e9phone sonne et l’ing\u00e9nieur <\/span>sur<\/span> le site<\/span> dit<\/span> :<\/span> \u00ab <\/span>On <\/span>entend \u00e0 travers votre mur<\/span>. L<\/span>e<\/span> son<\/span> traverse<\/span> m\u00eame si <\/span>j’ai achet\u00e9 le meilleur <\/span>CTS<\/span> sur le march\u00e9 ! \u00bb <\/span><\/em>Voil\u00e0 u<\/span>n sc\u00e9nario commun dans l’industrie de <\/span>la <\/span>cloison <\/span>mobile <\/span>et<\/span> \u00e7a<\/span> m\u00e9rite quelques <\/span>investigations<\/span>, <\/span>des <\/span>explications et particuli\u00e8rement <\/span>des suggestions <\/span>car il <\/span>est <\/span>reli<\/span>\u00e9<\/span> au <\/span>CTS<\/span> et aux <\/span>attentes<\/span> acoustiques de l’utilisateur.\u00a0<\/span><\/p>\n

\u00a0<\/span>Les<\/span>\u00a0<\/span>fausses <\/span>attentes <\/span>r\u00e9sultant d’un <\/span>CTS<\/span> \u00e9lev\u00e9<\/span><\/strong><\/span><\/p>\n

La plupart des utilisateurs <\/span>s<\/span>\u2019attendent \u00e0 <\/span>obtenir <\/span>une cloison <\/span>mobile<\/span> \u00ab insonoris\u00e9e<\/em> \u00bb <\/span>gr\u00e2ce \u00e0 laquelle <\/span>ils peuvent faire <\/span>tout le bruit d\u00e9sir\u00e9<\/span> d’un c\u00f4t\u00e9 et<\/span> que cela <\/span>(n\u2019aura pas d\u2019impact)<\/span> n’interf\u00e9rera pas<\/span> sur<\/span> les gens du<\/span> c\u00f4t\u00e9 oppos\u00e9 <\/span>simplement <\/span>parce qu’ils ont achet\u00e9 une cloison avec un <\/span>CTS<\/span> \u00e9lev\u00e9. <\/span>\u00a0<\/span>Tel que mentionn\u00e9 dans le <\/span>premier blog de cette s\u00e9rie<\/span>,<\/span>\u00a0<\/span>une<\/span> cloison <\/span>mobile<\/span> \u00ab insonoris\u00e9e \u00bb<\/span> n\u2019existe tout simplement pas<\/span><\/strong>.<\/strong> Consid\u00e9rez l<\/span>a charte <\/span>suivant<\/span>e <\/span>en tant que <\/span>rep\u00e8re<\/span>\u00a0<\/span>raisonnable et g\u00e9n\u00e9ralement acceptable<\/span>\u00a0<\/span>dans la r\u00e9alit\u00e9.<\/span>\u00a0\u00a0<\/span><\/p>\n

\u00a0<\/span><\/p>\n

CTS<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>I<\/span>solation sonore offerte\u00a0 <\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>Construction<\/span>\u00a0<\/span>\u00a0<\/span><\/strong><\/p>\n

\u00a0<\/span><\/p>\n

M<\/span>oins<\/span>\u00a0<\/span>de 30\u00a0 <\/span>\u00a0\u00a0\u00a0 <\/span>Discours normal<\/span>,<\/span> facile<\/span> \u00e0 entendre<\/span>\u00a0 <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 P<\/span>orte <\/span>creuse en m\u00e9tal s<\/span>ans\u00a0<\/span>coupe son<\/span><\/p>\n

30 – 35\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Discours normal audible, discours fort <\/span>entend<\/span>u<\/span>\u00a0\u00a0\u00a0 <\/span>\u00a0 <\/span>\u00a0 <\/span>\u00a0\u00a0<\/span>V<\/span>erre de \u00bd <\/span>pouce<\/span><\/p>\n

36 – 40\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u00a0\u00a0\u00a0\u00a0 <\/span>Discours fort<\/span>,<\/span> audible mais <\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u00a0<\/span>\u00a0\u00a0 <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span>C<\/span>loison s\u00e8che \u00bd sur <\/span>montants \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span>p<\/span>roba<\/span>blement <\/span>i<\/span>n<\/span>compr\u00e9hensible<\/span>\u00a0\u00a0\u00a0<\/span><\/p>\n

41 – 50\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Discours fort \u00e0 peine audible\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u00a0\u00a0 <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span>M<\/span>ur de bloc<\/span>s<\/span>\u00a0<\/span>de 8\u2019\u2019<\/span><\/p>\n

51 – 55\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Cris<\/span> \u00e0 peine audibles\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span>M<\/span>ur de b\u00e9ton <\/span>coul\u00e9 de <\/span>12\u2019\u2019<\/span>\u00a0<\/span><\/p>\n

P<\/span>ar cons\u00e9quent<\/span>,<\/span> l<\/span>e<\/span> meilleur <\/span>r\u00e9sultat<\/span> pratique <\/span><\/strong>pouvant \u00eatre esp\u00e9r\u00e9, <\/span>supposant qu’il n’y a<\/span>i<\/span>t<\/span> aucun chemin de flanquement (voir le blog pr\u00e9c\u00e9dent), <\/span>serait <\/span>des \u00ab cris \u00e0 peine audible<\/span>s \u00bb<\/span> si vous avez une cloison <\/span>d\u2019un<\/span>\u00a0<\/span>CTS<\/span> de <\/span>51 \u00e0 55. <\/span>Maintenant,<\/span> puisque les \u00ab cris \u00e0 peine audible<\/span>s<\/span> \u00bb se <\/span>situent<\/span> dans la gamme d’audition primaire <\/span>soit <\/span>de 400 hertz \u00e0 5000 hertz <\/span>alors <\/span>la question logique <\/span>qu\u2019on est en droit de se poser serait qu\u2019est-ce qui se produit<\/span> quand les <\/span>sons<\/span> en-dessous de 400 hertz et au-dessus de 5000 hertz sont pr\u00e9sents ?\u00a0\u00a0<\/span><\/p>\n

Le <\/span>CTS<\/span>\u00a0<\/span>par lui-m\u00eame <\/span>ne <\/span>donne <\/span>qu\u2019<\/span>une id\u00e9e approximative <\/span>de l\u2019intensit\u00e9 du son que le mur arr\u00eatera. <\/span>C<\/span>\u2019est la fa\u00e7on la plus utilis\u00e9e <\/span>m<\/span>ais <\/span>c\u2019est une <\/span>mani\u00e8re imparfaite pour mesurer la r\u00e9duction <\/span>du son<\/span><\/strong>. <\/span>I<\/span>l faut savoir que <\/span>le <\/span>CTS<\/span> n’est pas parfait et <\/span>qu\u2019<\/span>on <\/span>ne devrait <\/span>pas <\/span>s\u2019y fier totalement <\/span>dans <\/span>la r\u00e9alit\u00e9.<\/span>\u00a0<\/span><\/p>\n

Le<\/span>\u00a0<\/span>CTS<\/span> est <\/span>simplement <\/span>calcul\u00e9 en prenant les <\/span>pertes de transmission d<\/span>u<\/span>\u00a0<\/span>son<\/span>\u00a0<\/span>test\u00e9es<\/span> en<\/span> laboratoire <\/span>avec un<\/span> sp\u00e9cimen de cloison \u00e0 16 fr\u00e9quences standard<\/span>\u00a0<\/span>dans<\/span> la gamme de 125 <\/span>Hz<\/span> \u00e0 4000 <\/span>Hz<\/span> (voir le premier blog), tra<\/span>c<\/span>e<\/span>r <\/span>les <\/span>r\u00e9sult<\/span>ats<\/span> sur un graphique et <\/span>les <\/span>compare<\/span>r<\/span> \u00e0 une courbe<\/span> de r\u00e9f\u00e9rence<\/span> standard de <\/span>CTS<\/span> (<\/span>voil\u00e0 <\/span>un<\/span> prochain sujet \u00e0 traiter<\/span>)<\/span>. \u00c0 partir de ce calcul une valeur de <\/span>CTS<\/span> est d\u00e9termin\u00e9e. Le probl\u00e8me <\/span>majeur<\/span> est que le <\/span>CTS<\/span> r\u00e9sultant<\/span>\u00a0<\/span>consid\u00e8re seulement <\/span>les<\/span> fr\u00e9quences <\/span>jusqu\u2019\u00e0<\/span>\u00a0<\/span>125 <\/span>Hz<\/span>. <\/span>Cependant, q<\/span>uand vous vous<\/span>\u00a0<\/span>rendez compte que<\/span> la majorit\u00e9 des<\/span> sources sonores int\u00e9rieures<\/span> telles<\/span> qu’un syst\u00e8me <\/span>de<\/span>\u00a0<\/span>cin\u00e9ma maison <\/span>standard <\/span>(bruit amplifi\u00e9) ou les instruments musicaux tels que des guitares, des violons <\/span>et<\/span> des tambours ont <\/span>tous <\/span>une fr\u00e9quence \u00e0 125 hertz ou moins, <\/span>alors<\/span> la capacit\u00e9 pour que le <\/span>CTS<\/span>\u00a0<\/span>puisse pr\u00e9voir<\/span> toutes les <\/span>\u00e9ventuelles possibilit\u00e9s<\/span> acoustiques <\/span>est diminu\u00e9e<\/span>. M\u00eame avec un <\/strong><\/span>CTS<\/span> de<\/span> 55 \u00ab les cris sont \u00e0 peine audible<\/span>s \u00bb<\/span>\u00a0<\/span>mais <\/span>vous pouvez entendre un tambour,<\/span> une guitare ou des\u00a0 <\/span>bruits <\/span>significati<\/span>fs<\/span> amplifi\u00e9<\/span>s<\/span> tout \u00e0 fait clair<\/span>ement<\/span>. <\/span><\/strong>Maintenant, que se passe-t-il pour des sons au<\/span>-dessus de 4000 <\/span>Hz<\/span> puisque nous pouvons entendre jusqu’\u00e0 5000 <\/span>Hz<\/span> et <\/span>au-de<\/span>l\u00e0<\/span>?<\/span>\u00a0\u00a0\u00a0<\/span><\/p>\n

Le <\/span>ASTM E413 qui explique comment calculer le <\/span>CTS<\/span> d\u00e9crit <\/span>la limitation. <\/span>Voir<\/span>\u00a0<\/span>la partie <\/span>soulign\u00e9<\/span>e<\/span> ci-dessous :<\/span>\u00a0<\/span><\/p>\n

L<\/span>es <\/span>CTS<\/span>\u00a0<\/span>calcul\u00e9s \u00e0 l\u2019aide de la norme donnent de fa\u00e7on g\u00e9n\u00e9rale et subjective un indice de transmission sonore valide pour la parole, la radio, la t\u00e9l\u00e9vision et d\u2019autres sources semblables de bruit dans des bureaux et b\u00e2timents<\/span>.\u00a0 <\/span>\u00a0<\/span>Cette <\/span><\/span>classification n’est pas appropri\u00e9e pour des sources sonores <\/span>ayant<\/span> des gamme<\/span>s<\/span>\u00a0<\/span>de fr\u00e9quence<\/span>s<\/span>\u00a0<\/span>sensiblement diff\u00e9rent<\/span>e<\/span>s de <\/span>celles<\/span> \u00e9num\u00e9r\u00e9es ci-dessus.<\/span><\/span> De telles sources incluent des machines, des processus industriels, des <\/span>all\u00e9es<\/span> de <\/span>quilles<\/span>, des transformateurs <\/span>\u00e9lectriques<\/span>, des instruments musicaux, des syst\u00e8mes de <\/span><\/span>son<\/span><\/span>,<\/span> et des bruits de transport tels que les v\u00e9hicules \u00e0 moteur, l<\/span>es <\/span>avion<\/span>s <\/span>et les trains. <\/span>Pour ces sources, l’\u00e9valuation pr\u00e9cise de la transmission <\/span>d<\/span>u<\/span> son <\/span>exige une analyse d\u00e9taill\u00e9e <\/span>par<\/span> bandes de fr\u00e9quence<\/span>s<\/span>.<\/span>\u00a0<\/span><\/span><\/p>\n

\u00a0<\/span>Les<\/span> auteurs<\/span> d<\/span>e la norme<\/span> ont identifi\u00e9 les limitations et les applications du <\/span>CTS<\/span> et ont <\/span>a<\/span>vis\u00e9<\/span> que le <\/span>CTS<\/span><\/strong> ne devrait pas \u00eatre employ\u00e9 comme mesure d’int\u00e9grit\u00e9 acoustique dans toutes les circonstances.<\/strong> Vous devez <\/span>identifier<\/span>\u00a0<\/span> les<\/span> fr\u00e9quence<\/span>s<\/span>\u00a0<\/span>d<\/span>es <\/span>sons<\/span> que vous d\u00e9sirez contr\u00f4ler<\/span>, particuli\u00e8rement si <\/span>c<\/span>es <\/span>bruits<\/span>\u00a0<\/span>sont <\/span>de basse<\/span>s<\/span> fr\u00e9quence<\/span>s<\/span>, et v\u00e9rifier ces fr\u00e9quences sur le graphique des r\u00e9sultats de laboratoire.<\/span>\u00a0<\/span> Choisi<\/span>ssez<\/span> la cloison qui contr\u00f4le le mieux le son \u00e0 ces fr\u00e9quences\u00a0<\/span>plut\u00f4t qu<\/span>\u2019<\/span>un<\/span>e cloison<\/span> qui a simplement <\/span>un<\/span>\u00a0<\/span>CTS<\/span>\u00a0<\/span>plus <\/span>\u00e9lev\u00e9<\/span>. Il est <\/span>fort<\/span> possible qu’un<\/span>e<\/span>\u00a0<\/span>cloison<\/span> avec <\/span>un <\/span>CTS<\/span>\u00a0<\/span>moindre soit m<\/span>eilleur<\/span>e<\/span> \u00e0 <\/span>maitriser <\/span>de basses fr\u00e9quences qu’un<\/span>e<\/span> autre<\/span> avec un <\/span>CTS<\/span> plus \u00e9lev\u00e9.<\/span>\u00a0<\/span><\/p>\n

\u00a0<\/span>Pour d<\/span>es d<\/span>iscours tel<\/span>s<\/span> que <\/span>\u00ab des<\/span> cris \u00e0 peine audibles \u00bb, <\/span>avec <\/span>des sons <\/span>tous <\/span>dans la gamme<\/span> de fr\u00e9quences<\/span>\u00a0<\/span>entre<\/span>\u00a0<\/span>400 <\/span>Hz<\/span> \u00e0 5000 <\/span>Hz<\/span>, il n\u2019y a<\/span> aucun probl<\/span>\u00e8me. Par contre, guitares, tambours, <\/span>des <\/span>sons graves<\/span> produi<\/span>ts<\/span>\u00a0<\/span>par <\/span>des instruments et presque tous <\/span>les sons d\u2019amplificateurs, <\/span>tous en-dessous de 125 hertz<\/span>\u00a0<\/span>ressortiront <\/span>probablement <\/span>avec toutes sortes de <\/span>probl\u00e8mes m\u00eame avec un <\/span>CTS<\/span> \u00e9lev\u00e9<\/span>.\u00a0<\/span><\/p>\n

Le <\/span>CTS<\/span> est fortement surestim\u00e9 et <\/span>sur-em<\/span>ploy\u00e9.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

La cloison est install\u00e9e par un distributeur accr\u00e9dit\u00e9 par le fabricant et l\u00e0, vous vous dites; tout va bien.\u00a0\u00a0Soudainement le t\u00e9l\u00e9phone sonne et l’ing\u00e9nieur sur le site dit : \u00ab On entend \u00e0 travers votre mur. Le son traverse m\u00eame si j’ai achet\u00e9 le meilleur CTS sur le march\u00e9 ! \u00bb Voil\u00e0 un sc\u00e9nario commun…<\/p>\n","protected":false},"author":1,"featured_media":3293,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[234,236,225,55],"tags":[],"class_list":["post-1654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pour-les-architectes","category-pour-les-entrepreneurs","category-informations-acoustiques","category-nouvelles-et-evenements"],"acf":[],"yoast_head":"\nModerco - CTS et les attentes acoustiques<\/title>\n<meta name=\"description\" content=\"La plupart des utilisateurs s'attendent \u00e0 obtenir une cloison mobile "insonoris\u00e9e", s'ils choisissent une cloison avec un CTS \u00e9lev\u00e9, mais ceci n'existe pas.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.moderco.com\/fr\/cts-et-les-attentes-acoustiques\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Moderco - 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