{"id":601,"date":"2019-11-15T10:46:11","date_gmt":"2019-11-15T01:46:11","guid":{"rendered":"https:\/\/www.etani.co.jp\/en\/wordpress\/?post_type=update&#038;p=601"},"modified":"2020-01-07T15:13:46","modified_gmt":"2020-01-07T06:13:46","slug":"%e7%95%b0%e9%9f%b3%e6%a4%9c%e6%9f%bbrub-buzz-%e3%83%84%e3%83%bc%e3%83%ab","status":"publish","type":"update","link":"https:\/\/www.etani.co.jp\/en\/update\/601\/","title":{"rendered":"Rub &#038; Buzz\u2002Analysis\u2002Tool"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">\uff11\uff0e    Purpose<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The S-255 model has the ability to speedily detect low level rub and buzz noise. The rub and buzz detection extracts noise elements by the subsequent mechanisms<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> (1) Noise is differentiated from the main signals by employing the fact that noise appears as high harmonic components of driving signals of speakers.  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> (2) noise is removed by adopting the idea that rub and buzz noise is composed of constituents that have correlation with driving signals. The combination makes the tool exceptionally superior in detecting rub and buzz noise, and being noise resistant as well as verifying good\/defective samples objectively. Thus ETANI has been promoting this ability for more than 20 years. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(2) is an automatic mechanism, so there is no need to set up. But in (1), the harmonic distortion that occurs in normal speakers, and the high harmonic components generated by rub and buzz, are separated by a high pass filter with a cutoff frequency that varies according to the fundamental wave and tracking. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> Therefore, how effectively the high pass filter is set up in order to differentiate the rub and buzz noise, becomes the key to utilizing this tool.   <\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Here, the Rub &amp; Buzz Analysis Tool has been developed to observe this. It provides:<\/p>\n\n\n\n<ul class=\"dot wp-block-list\"><li> Enhanced Measurement Software: Digitally records sound extracted by a measurement  microphone.  <\/li><li> Sonar Graph: Analyzes frequencies of recorded sound. Shows the differences between components of good\/defective sound. Displays the changing sweep sound over time in a time vs. frequency view.   <\/li><\/ul>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">On the basis of analyzed results by Sonar Graph, you set up the cut-off frequency of high pass filter as follows:<\/p>\n\n\n\n<ul class=\"dot wp-block-list\"><li> Exclude distortion components that appear in good samples from filter components. <\/li><li> Define a cutoff frequency so that only what is recognized as noise passes through.   <\/li><\/ul>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"714\" height=\"702\" src=\"https:\/\/www.etani.co.jp\/en\/wordpress\/wp-content\/uploads\/1ch_App3-2_1.png\" alt=\"\" data-id=\"966\" data-link=\"https:\/\/www.etani.co.jp\/en\/wordpress\/update\/601\/1ch_app3-2_1\/\" class=\"wp-image-966\"\/><figcaption class=\"blocks-gallery-item__caption\">Right Sound Sample<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"714\" height=\"702\" src=\"https:\/\/www.etani.co.jp\/en\/wordpress\/wp-content\/uploads\/1ch_App3-2_2.png\" alt=\"\" data-id=\"967\" data-link=\"https:\/\/www.etani.co.jp\/en\/wordpress\/update\/601\/1ch_app3-2_2\/\" class=\"wp-image-967\"\/><figcaption class=\"blocks-gallery-item__caption\">Abnormal Sound Sample<\/figcaption><\/figure><\/li><\/ul><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\uff12. How to Use S-255 Rub &amp; Buzz Analysis Tool<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Use the\ntool as follows:<\/p>\n\n\n\n<ul class=\"dot wp-block-list\"><li> Prepare good and defective samples, and measure using the S-255.  <\/li><li> Save wave data to a file when testing.  <\/li><li> Load saved wave data to the Sonar Graph. Examine data and set the filter constants. If necessary, open sonar graph screens of different samples and compare them to consider the filter constants. <\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"featured_media":0,"parent":0,"menu_order":26,"template":"","update_category":[22],"class_list":["post-601","update","type-update","status-publish","hentry","update_category-useful"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\uff11\uff0e Purpose The S-255 model has the ability to speedily\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.etani.co.jp\/en\/update\/601\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"ja_JP\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ETANI - ETANI ELECTRONICS CO., LTD.\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Rub &amp; 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