{"id":1230,"date":"2015-10-29T14:56:39","date_gmt":"2015-10-29T20:56:39","guid":{"rendered":"http:\/\/blog.faberacoustical.com\/?p=1230"},"modified":"2015-10-29T14:56:39","modified_gmt":"2015-10-29T20:56:39","slug":"set-arbitrary-frequency-limits-in-signalscope-pro-6-2","status":"publish","type":"post","link":"https:\/\/blog.faberacoustical.com\/wpblog\/2015\/news\/set-arbitrary-frequency-limits-in-signalscope-pro-6-2\/","title":{"rendered":"Set arbitrary frequency limits in SignalScope Pro 6.2"},"content":{"rendered":"<p>The FFT-based spectrum analyzer in SignalScope Pro 6.2 allows arbitrary upper and lower frequency bounds (Fmax and Fmin) to be specified for the spectrum display. The cursor peak track function will operate only within the specified frequency bounds. The hardware sample rate may optionally be automatically adjusted to best match the specified value for Fmax.<\/p>\n<p><a href=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1234 size-medium\" src=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits-174x300.png\" alt=\"FFT_Plot_Limits\" width=\"174\" height=\"300\" srcset=\"https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits-174x300.png 174w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits-593x1024.png 593w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits-87x150.png 87w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits-400x691.png 400w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits.png 625w\" sizes=\"auto, (max-width: 174px) 100vw, 174px\" \/><\/a>\u00a0 \u00a0 \u00a0<a href=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2015\/10\/FFT_Options.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1233 size-medium\" src=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2015\/10\/FFT_Options-174x300.png\" alt=\"FFT_Options\" width=\"174\" height=\"300\" srcset=\"https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Options-174x300.png 174w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Options-593x1024.png 593w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Options-87x150.png 87w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Options-400x691.png 400w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Options.png 625w\" sizes=\"auto, (max-width: 174px) 100vw, 174px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits_2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1235 size-medium\" src=\"http:\/\/www.faberacoustical.com\/wpblog\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits_2-300x117.png\" alt=\"FFT_Plot_Limits_2\" width=\"300\" height=\"117\" srcset=\"https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits_2-300x117.png 300w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits_2-1024x401.png 1024w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits_2-150x59.png 150w, https:\/\/blog.faberacoustical.com\/wp-content\/uploads\/2015\/10\/FFT_Plot_Limits_2-400x157.png 400w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><strong>An example:<\/strong><\/p>\n<p>A typical minimum\u00a0sample rate of iOS hardware is 8 kHz. If a frequency resolution of 1 Hz is used for the spectrum, and values of 10 and 400 are specified for Fmin and Fmax, respectively, the\u00a0data between 10 and 400 Hz will be plotted and the plot will be scaled to extend only from\u00a010 and 400 Hz. If the\u00a0cursor peak track function is enabled, the cursor will find the frequency of the highest magnitude between 10 and 400 Hz.<\/p>\n<p>If the option to automatically adjust the sample rate based on Fmax has been selected, the hardware sample rate (Fs) will automatically be reduced to the minimum rate required to acquire data up to 400 Hz. In the case of typical iOS or USB audio input hardware, this rate would be 8 kHz.\u00a0Since FFT data would then include values between 0 and 4 kHz, an additional option allows either all data (0 to 4 kHz) or only data from 10 to 400 Hz to be exported when saving FFT data to a CSV, TXT, or MAT file. Note that the DC term may\u00a0be omitted from exported data when FFT data is displayed on a logarithmic frequency scale.<\/p>\n<p><strong>Also new in SignalScope Pro 6.2:<\/strong><\/p>\n<ul>\n<li>When \u201ccpm\u201d is selected for units of frequency, exported data files will include frequencies specified in cpm.<\/li>\n<li>The nominal microphone sensitivity is properly set on the new iPhones.<\/li>\n<li>Other bug fixes\/stability enhancements, including iOS 9 compatibility.<\/li>\n<\/ul>\n<p>Similar improvements have been\u00a0added to version 7.2 of SignalScope. Specifying values for Fmin and Fmax in SignalScope require the Data Acquisition Upgrade, which is available via in-app purchase.<\/p>\n<p><a href=\"https:\/\/itunes.apple.com\/us\/app\/signalscope\/id284781777?mt=8&amp;uo=4&amp;at=11lppv&amp;pt=9643&amp;ct=FaberBlog\" target=\"_blank\">Download SignalScope 7.2<\/a><\/p>\n<p><a href=\"https:\/\/geo.itunes.apple.com\/us\/app\/signalscope-pro\/id316467618?mt=8&amp;at=11lppv&amp;pt=9643&amp;ct=FaberBlog\" target=\"_blank\">Download SignalScope Pro 6.2<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The FFT-based spectrum analyzer in SignalScope Pro 6.2 allows arbitrary upper and lower frequency bounds (Fmax and Fmin) to be specified for the spectrum display.<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,20],"tags":[103,98,30,11,22,34,80,16,29,31,81],"class_list":["post-1230","post","type-post","status-publish","format-standard","hentry","category-ios","category-news","tag-ios","tag-iphone","tag-measurement","tag-microphone","tag-signalscope","tag-signalscope-pro","tag-sound","tag-spectrum","tag-test","tag-usb","tag-vibration"],"_links":{"self":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts\/1230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/comments?post=1230"}],"version-history":[{"count":4,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts\/1230\/revisions"}],"predecessor-version":[{"id":1237,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/posts\/1230\/revisions\/1237"}],"wp:attachment":[{"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/media?parent=1230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/categories?post=1230"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.faberacoustical.com\/wpblog\/wp-json\/wp\/v2\/tags?post=1230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}