{"id":6557,"date":"2021-01-14T20:49:27","date_gmt":"2021-01-14T18:49:27","guid":{"rendered":"https:\/\/www.loudspeakers.audio\/?post_type=ufaq&#038;p=6557"},"modified":"2025-11-01T13:01:18","modified_gmt":"2025-11-01T11:01:18","slug":"perfomance-rating","status":"publish","type":"ufaq","link":"https:\/\/www.loudspeakers.audio\/fr\/faqs\/perfomance-rating\/","title":{"rendered":"Indice de performance"},"content":{"rendered":"<style>.ewd-ufaq-post-margin-symbol { color: #4055a9 !important; }.ewd-ufaq-post-margin-symbol { border-color: #53037d !important; }.ewd-ufaq-faq-display-style-block.ewd-ufaq-post-active, .ewd-ufaq-faq-display-style-block.ewd-ufaq-post-active a,.ewd-ufaq-faq-display-style-block:hover, .ewd-ufaq-faq-display-style-block:hover a, .ewd-ufaq-faq-display-style-block:hover h5 { background-color: #617ffe !important; }.ewd-ufaq-faq-display-style-border_block.ewd-ufaq-post-active, .ewd-ufaq-faq-display-style-border_block:hover, .ewd-ufaq-faq-display-style-border_block:hover h5 { background-color: #617ffe !important; }.ewd-ufaq-faq-display-style-border_block .ewd-ufaq-faq-body { border-color: #617ffe !important; }.ewd-ufaq-faq-display-style-border_block .comment-reply-title, .ewd-ufaq-faq-display-style-border_block:hover .comment-reply-title { background-color: transparent !important; }.ewd-ufaq-faq-display-style-block:hover .ewd-ufaq-post-margin-symbol, .ewd-ufaq-category-post-margin-symbol, .ewd-ufaq-faq-display-style-block:hover h5 { color: #4055a9 !important; }.ewd-ufaq-faq-display-style-border_block:hover .ewd-ufaq-post-margin-symbol, .ewd-ufaq-category-post-margin-symbol, .ewd-ufaq-faq-display-style-border_block:hover h5 { color: #4055a9 !important; }.ewd-ufaq-faq-header-title a { color: #7b2c2c !important; }div.ewd-ufaq-faq-title h5 { color: #4055a9 !important; }div.ewd-ufaq-faq-post p { color: #000000 !important; }div.ewd-ufaq-faq-category-title h3 { color: #2b1010 !important; }div.ewd-ufaq-faq-categories, div.ewd-ufaq-faq-tags { color: #9b4c4c !important; }div.ewd-ufaq-faq-categories, div.ewd-ufaq-faq-tags { margin: 30 !important; }<\/style><div  class=\"ewd-ufaq-faq-list ewd-ufaq-page-type-infinite_scroll ewd-ufaq-category-tabs-\" id='ewd-ufaq-faq-list'>\n\n\t<input type='hidden' name='show_on_load' value='' id='ewd-ufaq-show-on-load' \/>\n<input type='hidden' name='include_category' value='' id='ewd-ufaq-include-category' \/>\n<input type='hidden' name='exclude_category' value='' id='ewd-ufaq-exclude-category' \/>\n<input type='hidden' name='orderby' value='set_order' id='ewd-ufaq-orderby' \/>\n<input type='hidden' name='order' value='asc' id='ewd-ufaq-order' \/>\n<input type='hidden' name='post_count' value='-1' id='ewd-ufaq-post-count' \/>\n<input type='hidden' name='current_url' value='\/fr\/wp-json\/wp\/v2\/ufaq\/6557' id='ewd-ufaq-current-url' \/>\n\t\n\t\n\t<div class='ewd-ufaq-faqs'>\n\n\t\t<div  class=\"ewd-ufaq-faq-div ewd-ufaq-faq-column-count-two ewd-ufaq-faq-responsive-columns-1 ewd-ufaq-faq-display-style-minimalist ewd-ufaq-can-be-toggled\" id='ewd-ufaq-post-6557-MvYQbKNmQE' data-post_id='6557'>\n\n\t\t\n\t<div class='ewd-ufaq-faq-title ewd-ufaq-faq-toggle'>\n\t\n\t<a class='ewd-ufaq-post-margin'  href='#' role=\"button\">\n\n\t\t<div class='ewd-ufaq-post-margin-symbol ewd-ufaq-square'>\n\t\t\t<span >B<\/span>\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-faq-title-text'>\n\n\t\t\t<h5>\n\t\t\t\tIndice de performance\t\t\t<\/h5>\n\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-clear'><\/div>\n\n\t<\/a>\n\t\n<\/div>\n\t\n\t<div class='ewd-ufaq-faq-body' >\n\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t<div class='ewd-ufaq-post-margin ewd-ufaq-faq-post'>\n\t<p>Les graphiques ne sont pas toujours facilement compr\u00e9hensibles par tous. Aussi nous avons ajout\u00e9 un indice de performance. Nous avons test\u00e9 les indices propos\u00e9s par Sean Olive dans les documents AES 6113 et 6190 mais pour certaines raisons, les r\u00e9sultats n'ont pas \u00e9t\u00e9 concluants. Ces indices sont bas\u00e9s sur des mesures en chambre sourde avec un calcul de pr\u00e9diction en pi\u00e8ce d'\u00e9coute. Notre m\u00e9thode ne pr\u00e9sente que des mesures dans le local d'\u00e9coute et notre indice ne peut donc \u00eatre bas\u00e9 que sur ces mesures.<\/p>\n<p>Nous obtenons le score \u00e0 partir de trois calculs :<\/p>\n<ul>\n<li>SM_IRR SMoothness of InRoom Response  entre 125 et 11500Hz : la proposition de S. Olive n'est pas intuitive (coefficient de Pearson) et cette fonction n'a pas \u00e9t\u00e9 utilis\u00e9e<\/li>\n<li>NBD Narrow Band Deviation of InRoom Response entre 125 et 11500Hz (6.5 octaves)  : ces d\u00e9viations sont qualifi\u00e9es par la mesure de la surface diff\u00e9rentielle entre la courbe liss\u00e9e au 1\/20e d'octave et celle au 1\/2 octave, donc pas li\u00e9e \u00e0 la cible ni \u00e0 la pente g\u00e9n\u00e9rale<\/li>\n<li>WBD d\u00e9viation de la r\u00e9ponse par calcul de la surface diff\u00e9rentielle (donc li\u00e9e \u00e0 la variance) entre la r\u00e9ponse et la courbe cible entre 125 et 11500Hz (6.5 octaves)<\/li>\n<li>LFD d\u00e9viation de la courbe en basses LFD Low Frequencies Deviation, d\u00e9viation des courbes de fr\u00e9quences de 25 \u00e0 125Hz calcul\u00e9e sur une \u00e9chelle des fr\u00e9quences lin\u00e9aire. Une \u00e9chelle lin\u00e9aire est choisie parce que nous consid\u00e9rons que les probl\u00e8mes dans la partie haute de cette gamme de fr\u00e9quence sont plus importants que vers les tr\u00e8s basses fr\u00e9quences. A noter que cette courbe cible est plate sous 80Hz et ne tient pas compte de la valeur du filtre passe-haut choisi, donc pas exactement identique \u00e0 la cible LF choisie dans le formulaire Upload Recording et est calcul\u00e9 \u00e0 partir de la courbe L+R donc +6dB par rapport \u00e0 la valeur choisie pour un canal.<\/li>\n<li>A noter que la valeur affich\u00e9e est la moins bonne des valeurs en L ou R pour la st\u00e9r\u00e9o ou L,C,et R en multicanal<\/li>\n<\/ul>\n<p>Indice global de performance = 0.25*NBD + 0.4*WBD + 0.35*LFD<br \/>\nIl ne faut pas oublier que cet indice global de performance est bas\u00e9 uniquement sur les r\u00e9ponses mesur\u00e9es en amplitude ce qui ne repr\u00e9sente pas l'ensemble des crit\u00e8res d'audibilit\u00e9 : niveaux max, directivit\u00e9, distortions, phase et r\u00e9ponse temporelle, etc...\nIl faut donc \u00eatre prudent en comparant diff\u00e9rents syst\u00e8mes, la meilleure performance calcul\u00e9e ne correspond pas forc\u00e9ment au meilleur syst\u00e8me. Par contre la comparaison avant\/apr\u00e8s \u00e9galisation est certainement valable.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n\t\t\n\t\t\t<div class='ewd-ufaq-permalink'>\n\t\n\t<a href='https:\/\/www.loudspeakers.audio\/fr\/faqs\/perfomance-rating\/single-faq\/perfomance-rating\/'>\n\t\t\n\t\tPermalink\t\t\t\n\t<\/a>\n\n<\/div>\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t<div class='ewd-ufaq-faq-custom-fields'>\n\n\t\n<\/div>\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t<\/div>\n\n<\/div>\n\t<\/div>\n\n\t\n<\/div>","protected":false},"excerpt":{"rendered":"<p>B Performance rating For many people, most curves and graphs are not so easy to understand so some of you have asked about a simple performance rating. We have tested the ratings proposed by Sean Olive in AES papers 6113 and 6190 but for some reasons, it was not totally &hellip;<\/p>","protected":false},"author":1,"featured_media":0,"template":"","ufaq-category":[181],"ufaq-tag":[],"class_list":["post-6557","ufaq","type-ufaq","status-publish","hentry","ufaq-category-2-measurements"],"_links":{"self":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq\/6557","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq"}],"about":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/types\/ufaq"}],"author":[{"embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/media?parent=6557"}],"wp:term":[{"taxonomy":"ufaq-category","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-category?post=6557"},{"taxonomy":"ufaq-tag","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-tag?post=6557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}