{"id":1512,"date":"2020-06-29T03:07:37","date_gmt":"2020-06-29T03:07:37","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=1512"},"modified":"2020-06-29T03:07:37","modified_gmt":"2020-06-29T03:07:37","slug":"audio-normalization-or-compression","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/","title":{"rendered":"Audio normalization or compression"},"content":{"rendered":"<p>The function of a compressor is to reduce the dynamic range of the signal, that is, the level difference between the strongest and weakest signal parts.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#Why_compression_or_normalize\" >Why compression or normalize?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#Level_settings\" >Level settings<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#%E2%80%93_Threshold_threshold_level_in_dB\" >&#8211; Threshold (threshold level, in dB)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#%E2%80%93_Ratio_compression_ratio\" >&#8211; Ratio (compression ratio)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#Set_up_a_compressor\" >Set up a compressor<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#%E2%80%93_Attack_attack_in_ms\" >&#8211; Attack (attack, in ms)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#%E2%80%93_Launch_launch_in_ms_and_s\" >&#8211; Launch (launch, in ms and s)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/#%E2%80%93_Knee_literally_knee\" >&#8211; Knee (literally knee!)<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_compression_or_normalize\"><\/span>Why compression or normalize?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>At the time of analog, the limited dynamics of the main musical supports (vinyl, audio and video cassettes) did not allow to reproduce the dynamics of a classical, jazz or even rock orchestra in the case of the audio cassette. Therefore, the signal was compressed to avoid distortion in the transmission medium.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/blog.landr.com\/wp-content\/uploads\/2018\/01\/How-to-dial-in-perfect-compressor-settings-2-Threshold.png\" alt=\"audio compression or normalization\" width=\"945\" height=\"545\" \/><\/p>\n<p>Now that the music is converted to 16-bit or more, recorded in digital format, and then streamed to CD \/ DVD or downloaded, the dynamics of the media is enough to faithfully reproduce the dynamics of almost any orchestra. The old technical limitations have disappeared, therefore compression is no longer essential.<\/p>\n<p>However, whatever the musical genre, some sources (voices) are compressed almost systematically. The goal of modern compression is therefore to optimize sound recording, either to get closer to reality or, conversely, to create a less faithful but denser, more controlled, more powerful sound, etc., or even a sound. totaly new.<\/p>\n<p>And to do all this, the compressor is satisfied with a simple principle: it reduces dynamics by attenuating the signal level when the latter exceeds a given threshold level.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Level_settings\"><\/span>Level settings<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"%E2%80%93_Threshold_threshold_level_in_dB\"><\/span>&#8211; Threshold (threshold level, in dB)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This parameter determines the threshold level from which the compressor is triggered. As long as the input signal level remains below the threshold, the compressor does not start and no treatment is applied. As soon as the source signal exceeds the threshold level, compression is applied.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E2%80%93_Ratio_compression_ratio\"><\/span>&#8211; Ratio (compression ratio)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The ratio determines the amount of level reduction applied to the part of the signal that exceeds the threshold level, the rest of the signal is not processed. Depending on the compressor, the ratio can vary from 1: 1 to Inf: 1. Qu\u00e9saco?<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Set_up_a_compressor\"><\/span>Set up a compressor<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>With a 1: 1 ratio, no compression is applied, the level of the input signal is equal to that of the output signal. With a ratio of 2: 1, the level of the signal portion that exceeds the threshold is divided by 2 in the output signal. With a 3: 1 ratio, it is divided by 3, etc. When the compression ratio is infinite (Inf: 1 ratio), the compressor behaves like a limiter: the output signal never exceeds the threshold level, regardless of the input level.<\/p>\n<p>Therefore, the compression intensity applied to the signal is a compromise between the threshold and the compression rate setting:<\/p>\n<p>The lower the threshold, the larger the compressed signal portion.<br \/>\nThe higher the ratio, the greater the level reduction applied to the signal portion above the threshold.<br \/>\nDepending on the compressors, you may find other parameters, for example, an input level setting instead of the threshold, or a gain setting (also called the offset or output level) that amplifies the signal to compensate for the drop in level resulting from compression.<\/p>\n<p>Time settings<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E2%80%93_Attack_attack_in_ms\"><\/span>&#8211; Attack (attack, in ms)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Attack corresponds to the time the compressor needs to reach the given ratio when the signal level exceeds the threshold level. A quick attack of a few milliseconds triggers strong compression as soon as the signal level exceeds the threshold; With a slower attack, the compressor passes the first transients of the signal peaks, keeping one side alive and well cut.<\/p>\n<p>Set up a compressor<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E2%80%93_Launch_launch_in_ms_and_s\"><\/span>&#8211; Launch (launch, in ms and s)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Release corresponds to the time the compressor needs to return to the 1: 1 unit ratio when the source signal falls below the threshold level. A quick launch of a few tens of ms allows the original character to stay alive. Slower relaxation improves instrument resonance and reverberation, but can cause compression of the first peak transients when the latter are close together.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E2%80%93_Knee_literally_knee\"><\/span>&#8211; Knee (literally knee!)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The Knee parameter determines the increase in compression, that is, the transition between the compression ratio of the unit (1: 1, no compression) and the compression ratio set to ratio.<\/p>\n<p>Applications<\/p>\n<p>At the output, the compressor can be used as a limiter to control signal peaks and prevent distortion from occurring in the analog \/ digital conversion stage.<br \/>\nWhen taking and mixing, light compression can bring out weak parts of the signal and thus reveal certain details.<br \/>\nIn the mix, the compressor allows you to <span style=\"color: #ff0000;\"><strong>increase the average level of the audio volume output.<\/strong><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The function of a compressor is to reduce the dynamic range of the signal, that is, the level difference between the strongest and weakest signal parts. Why compression or normalize? At the time of analog, the limited dynamics of the main musical supports (vinyl, audio and video cassettes) did not allow to reproduce the dynamics &hellip; <a href=\"https:\/\/mp4gain.com\/mp4gain\/audio-normalization-or-compression\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Audio normalization or compression&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[257],"tags":[20954,20948,20949,20942,20945,20943,27918,20944,27919,20955,24525,27920,24524,20960,20958,20957,20962,20970,20967,20964,24527,24522,20968,27921,27931,20966,20965,35704,35703,27922,20937,20972,36255,20971,20973,20984,20981,20983,27924,20985,20980,20941,20995,20993,20992,33001,27908,20991,20989,20938,24537,24538,27926,24541,20999,24535,20998,24536,24546,24547,24549,24545,35706,33003,24550,24558,24555,24554,33002,27929,24561,36256,24565,24573,24567,24574,27933,36257,24568,24566,24570,24576,24578,24580,27932,20936,20939,20940,6634,24551,35705,27930,24552,20986,24544,24543,24564,24575,20950,20953],"class_list":["post-1512","post","type-post","status-publish","format-standard","hentry","category-audio-normalizer","tag-a-tutorial-on-mpeg-audio-compression","tag-audio-compression-adobe-audition","tag-audio-compression-adobe-premiere","tag-audio-compression-algorithms","tag-audio-compression-and-decompression","tag-audio-compression-app","tag-audio-compression-artifacts","tag-audio-compression-attack-and-release","tag-audio-compression-audacity","tag-audio-compression-basics","tag-audio-compression-benchmarks","tag-audio-compression-best-video","tag-audio-compression-bitrate","tag-audio-compression-bits","tag-audio-compression-bluetooth","tag-audio-compression-book","tag-audio-compression-box","tag-audio-compression-c-code","tag-audio-compression-calculator","tag-audio-compression-camtasia","tag-audio-compression-chart","tag-audio-compression-cheat-sheet","tag-audio-compression-cheat-sheet-pdf","tag-audio-compression-circuit","tag-audio-compression-code-in-java","tag-audio-compression-codecs","tag-audio-compression-comparison","tag-audio-compression-database","tag-audio-compression-davinci-resolve","tag-audio-compression-deep-learning","tag-audio-compression-definition","tag-audio-compression-diagram","tag-audio-compression-distortion","tag-audio-compression-driver","tag-audio-compression-dsp","tag-audio-compression-echo","tag-audio-compression-effect","tag-audio-compression-error","tag-audio-compression-examples","tag-audio-compression-exe","tag-audio-compression-exercises","tag-audio-compression-explained","tag-audio-compression-filter","tag-audio-compression-final-cut-pro-x","tag-audio-compression-for-dummies","tag-audio-compression-for-gaming","tag-audio-compression-for-live-streaming","tag-audio-compression-for-podcast","tag-audio-compression-for-streaming","tag-audio-compression-formats","tag-audio-compression-g-711","tag-audio-compression-g-711-a","tag-audio-compression-g-711u","tag-audio-compression-game","tag-audio-compression-github","tag-audio-compression-graph","tag-audio-compression-guide","tag-audio-compression-guide-pdf","tag-audio-compression-hardware","tag-audio-compression-headphones","tag-audio-compression-hearing","tag-audio-compression-history","tag-audio-compression-imovie","tag-audio-compression-in-camtasia","tag-audio-compression-in-hindi","tag-audio-compression-in-matlab","tag-audio-compression-in-multimedia","tag-audio-compression-in-premiere-pro","tag-audio-compression-in-zoom","tag-audio-compression-is-usually","tag-audio-compression-java","tag-audio-compression-javascript","tag-audio-compression-knee","tag-audio-compression-lesson","tag-audio-compression-library-android","tag-audio-compression-library-c","tag-audio-compression-light-or-heavy","tag-audio-compression-limiting-definition","tag-audio-compression-listening-tests","tag-audio-compression-lossless","tag-audio-compression-lossy-and-lossless","tag-audio-compression-matlab","tag-audio-compression-meaning","tag-audio-compression-mp3","tag-audio-compression-program-in-java","tag-audio-compression-ratio","tag-audio-compression-software","tag-audio-compression-sonos","tag-audio-compression-techniques","tag-audio-compression-using-huffman-coding","tag-audio-compression-using-huffman-coding-in-matlab","tag-audio-compression-using-java","tag-car-audio-compression-horns","tag-compression-audio-engineering","tag-g-711-audio-compression","tag-g-722-audio-compression","tag-java-audio-compression-library","tag-principe-de-la-compression-audio","tag-the-audio-compression-format","tag-what-is-a-audio-compression-file"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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