{"id":6982,"date":"2021-04-13T09:15:52","date_gmt":"2021-04-13T07:15:52","guid":{"rendered":"https:\/\/www.loudspeakers.audio\/?post_type=ufaq&#038;p=6982"},"modified":"2022-01-02T22:34:31","modified_gmt":"2022-01-02T20:34:31","slug":"delay-of-fir-filters","status":"publish","type":"ufaq","link":"https:\/\/www.loudspeakers.audio\/fr\/faqs\/delay-of-fir-filters\/","title":{"rendered":"D\u00e9lai des filtres FIR"},"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\/6982' 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-6982-KDCgt0borG' data-post_id='6982'>\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\tD\u00e9lai des filtres FIR\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 filtres FIR ajoutent un d\u00e9lai au signal. Pour des FIR sym\u00e9triques, le d\u00e9lai correspond \u00e0 la moiti\u00e9 des coefficients. Pour un processeur de 4096 taps \u00e0 48kHz, le d\u00e9lai est de 2048\/48000 soit environ 43ms. Ce qui n'a pas d'importance pour l'\u00e9coute de la musique mais peut poser un probl\u00e8me de lipsync avec la vid\u00e9o et surtout emb\u00eater un musicien pour du re-recording. dans ces cas, plut\u00f4t utiliser un FIR \u00e0 phase minimale.<\/p>\n<p>Notre technologie hybride utilise une r\u00e9ponse non sym\u00e9trique et le d\u00e9lai est environ moiti\u00e9 d'un filtre FIR sym\u00e9trique.<\/p>\n<p>Take care if your system has main front loudspeakers with FIR EQ (so are delayed) and a subwoofer with just parametric EQ (so without any delay), you certainly will have to add some delay to the subwoofer&#8230;You can check this with the graph p5 that shows a comparison of timings at different frequencies.<\/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\/delay-of-fir-filters\/single-faq\/delay-of-fir-filters\/'>\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 Delay of FIR filters FIR filters can add delay to the signal passing through it. For symetrical FIRs, the delay is half the filter length, ie for a processor working at 48kHz and with 4096 taps, the delay is 2048\/48000 second, near 43ms. This is unimportant when listening to &hellip;<\/p>","protected":false},"author":1,"featured_media":0,"template":"","ufaq-category":[186],"ufaq-tag":[],"class_list":["post-6982","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\/6982","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=6982"}],"wp:term":[{"taxonomy":"ufaq-category","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-category?post=6982"},{"taxonomy":"ufaq-tag","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-tag?post=6982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}