fader8 Posted December 3, 2011 Share Posted December 3, 2011 I've had several requests about how to find the exact frequency of various bits of audio, namely things like the initial tuning of a drum, which can be very elusive for a spectrum analyzer or impossible for a tuner plug-in. Here's how to do it and it's very simple! In the Sample Editor's View menu, choose Min:Sec:Ms: Zoom in on your sample enough to clearly see the waveform. Swipe to make a selection between consecutive zero crossings, as shown: In the top right of the Sample Editor, the length of your selection is shown in milliseconds. In this case it's 6 msec, (.006 seconds). We would only ever select the full wavelength if we knew the signal was a constant pitch. If that were the case, we probably wouldn't need to do this exercise! Since this selection is only one half of the wavelength, we need to double this time value to .012 seconds to determine the value in cycles per second (Hertz). Now open OSX's Calculator app and change the View preference to "Scientific". Enter the wavelength duration and then click the "Inverse" key: Presto! The frequency in Hertz of this kick's loudest fundamental is 83.3! That wasn't so hard, was it? Cheers, fader8 Quote Link to comment Share on other sites More sharing options...
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