{"id":7663,"date":"2021-06-05T12:06:00","date_gmt":"2021-06-05T10:06:00","guid":{"rendered":"https:\/\/www.loudspeakers.audio\/?post_type=ufaq&#038;p=7663"},"modified":"2022-11-05T23:41:54","modified_gmt":"2022-11-05T21:41:54","slug":"clock-mismatch-between-player-and-recorder","status":"publish","type":"ufaq","link":"https:\/\/www.loudspeakers.audio\/en\/faqs\/clock-mismatch-between-player-and-recorder\/","title":{"rendered":"Clock mismatch between player and recorder"},"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='\/en\/wp-json\/wp\/v2\/ufaq\/7663' 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-7663-LFdhdIOMLs' data-post_id='7663'>\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\tClock mismatch between player and recorder\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>Exponential sine sweeps (promoted by A. Farina) is a very nice technique to measure loudspeakers response with a good rejection of noises. But it may have problems when the player or recorder clock are unlocked (ie when you record on a computer that is independant of the player). In this case, the displayed impulse and step responses, spectrograms, wavelets,&#8230; may be distorded (don&#8217;t worry, the MMM part and so frequency response and correction are not affected). To avoid those problems, we have added in LA2v3 version, another time sync signal at the end of the audio sequence to automatically compensate for clock mismatch. The value of drifted samples is indicated in page p0. If mismatch is less than 2000ppm (CD Redbook specifications is 200ppm), the recording is resampled. This corresponds to about +-15360 samples for the stereo file. If mismatch is higher than 15360ppm, this is not considered as a clock difference but as a recording problem (ie usb dropouts,&#8230;) and so the recording is not resampled.<\/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\/en\/faqs\/clock-mismatch-between-player-and-recorder\/single-faq\/clock-mismatch-between-player-and-recorder\/'>\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 Clock mismatch between player and recorder Exponential sine sweeps (promoted by A. Farina) is a very nice technique to measure loudspeakers response with a good rejection of noises. But it may have problems when the player or recorder clock are unlocked (ie when you record on a computer that &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","ufaq-category":[181],"ufaq-tag":[],"class_list":["post-7663","ufaq","type-ufaq","status-publish","hentry","ufaq-category-2-measurements"],"_links":{"self":[{"href":"https:\/\/www.loudspeakers.audio\/en\/wp-json\/wp\/v2\/ufaq\/7663","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.loudspeakers.audio\/en\/wp-json\/wp\/v2\/ufaq"}],"about":[{"href":"https:\/\/www.loudspeakers.audio\/en\/wp-json\/wp\/v2\/types\/ufaq"}],"author":[{"embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/en\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/www.loudspeakers.audio\/en\/wp-json\/wp\/v2\/media?parent=7663"}],"wp:term":[{"taxonomy":"ufaq-category","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/en\/wp-json\/wp\/v2\/ufaq-category?post=7663"},{"taxonomy":"ufaq-tag","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/en\/wp-json\/wp\/v2\/ufaq-tag?post=7663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}