{"id":2310,"date":"2016-12-08T00:12:05","date_gmt":"2016-12-08T08:12:05","guid":{"rendered":""},"modified":"2020-08-04T13:28:20","modified_gmt":"2020-08-04T20:28:20","slug":"2310","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/2310","title":{"rendered":"How do I use LabQuest App to measure the frequency of sounds?"},"content":{"rendered":"

To measure and display the amplitude of various frequencies of sound using a fast Fourier transform:<\/p>\n

    \n
  1. Connect a microphone to any analog channel on the LabQuest or<\/b> choose Sensor Setup from the Sensor menu and check Internal Microphone and choose OK.<\/li>\n
  2. Prepare your sound source, such as a tuning fork, musical instrument, or telephone keypad. Hold the source a few centimeters from the end of the microphone (the location of the LabQuest’s internal microphone varies by device).<\/li>\n
  3. Press the Collect button to collect the data.<\/li>\n
  4. After data collection completes, tap Analyze > Advanced > FFT > Sound Pressure.<\/li>\n
  5. The Fast Fourier Transform display will show amplitudes for various frequency intervals across a spectrum. In the bottom right corner, the peak frequency is displayed.<\/li>\n
  6. You can also get information about other frequencies by choosing their locations on the screen.<\/li>\n
  7. After you choose OK, the peak frequency determined by the Fast Fourier Transform is displayed alongside the original graph.<\/li>\n<\/ol>\n

    With pure tones, you can also calculate the period and frequency by measuring the time between peaks:<\/p>\n

      \n
    1. Choose Delta from the Analyze menu. Drag from peak to peak across several (e.g., 5) waveforms. Write down the Delta X (time) value.<\/li>\n
    2. Choose the Calculator from the Home screen (for LabQuest 2 the calculator is accessed from the Accessories folder), enter the Delta X value you measured, and divide it by the number of waveforms to determine the period for one wave.<\/li>\n
    3. Choose X^-1 on the calculator to determine the Frequency from the Period.<\/li>\n<\/ol>\n

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      To measure and display the amplitude of various frequencies of sound using a fast Fourier transform: Connect a microphone to any analog channel on the…<\/p>\n","protected":false},"author":43901,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[323,350,2462,3785,535,533],"class_list":["post-2310","post","type-post","status-publish","format-standard","hentry","tag-fft","tag-frequency","tag-labq","tag-labq2","tag-mca-bta","tag-microphone"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2310","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/43901"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=2310"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2310\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=2310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=2310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=2310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}