{"id":6980,"date":"2021-04-13T09:32:45","date_gmt":"2021-04-13T07:32:45","guid":{"rendered":"https:\/\/www.loudspeakers.audio\/?post_type=ufaq&#038;p=6980"},"modified":"2023-09-05T21:40:15","modified_gmt":"2023-09-05T19:40:15","slug":"fir-filter-how-many-taps-do-you-need","status":"publish","type":"ufaq","link":"https:\/\/www.loudspeakers.audio\/fr\/faqs\/fir-filter-how-many-taps-do-you-need\/","title":{"rendered":"Filtre FIR : combien de taps ?"},"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\/6980' 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-6980-CNMSLjDqe5' data-post_id='6980'>\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\tFiltre FIR : combien de taps ?\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>Avec plus de coefficients (taps), la correction est plus pr\u00e9cise dans les basses fr\u00e9quences. Mais une correction trop pr\u00e9cise peut \u00eatre g\u00e2ch\u00e9e par des conditions modifi\u00e9es : temp\u00e9rature ou humidit\u00e9, portes ou fen\u00eatres ouvertes ou ferm\u00e9es, nouveau mobilier, etc... En pratique et \u00e0 44.1 ou 48kHz, 2048 taps est un minimum et je ne pense pas que plus de 16384 soit vraiment utile ou m\u00eame recommand\u00e9. De plus, la plupart des processeurs FIR disposent aussi de correcteurs param\u00e9triques pour \u00e9ventuellement compl\u00e9ter la correction dans les basses fr\u00e9quences. En g\u00e9n\u00e9ral, il est plut\u00f4t recommand\u00e9 d'utiliser entre 4096 et 8192 taps. Mais si vous n'avez que 2048 taps ou moins, il est vraiment pr\u00e9f\u00e9rable d'utiliser une correction \u00e0 phase minimale.<\/p>\n<div id=\"nHjxyaJUBEChO\"><\/div>\n<p>Avec la plupart des processeurs, commencer d'abord par corriger le grave avec des EQ param\u00e9triques puis remesurer pour calculer la correction FIR.<\/p>\n<p>Il faut aussi se rappeler que pour des fr\u00e9quences d'\u00e9chantillonnage plus \u00e9lev\u00e9es, il faut proportionnellement plus de taps : 8192 \u00e0 48kHz sont \u00e9quivalents \u00e0 16384 \u00e0 96kHz.<\/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\/fir-filter-how-many-taps-do-you-need\/single-faq\/fir-filter-how-many-taps-do-you-need\/'>\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 FIR filter : how many taps do I need ? With more taps, you get a better precision for lowest frequencies correction. But a too precise correction may be spoiled by varying parameters : temperature or humidity, opened\/closed doors or windows, moved furniture, aso&#8230; So practically, at 44.1 or &hellip;<\/p>","protected":false},"author":1,"featured_media":0,"template":"","ufaq-category":[186],"ufaq-tag":[],"class_list":["post-6980","ufaq","type-ufaq","status-publish","hentry","ufaq-category-6-acoustics-and-eq"],"_links":{"self":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq\/6980","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=6980"}],"wp:term":[{"taxonomy":"ufaq-category","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-category?post=6980"},{"taxonomy":"ufaq-tag","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-tag?post=6980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}