[This article was written by Alex Andrews of Ten Kettles Inc. Their new music theory app, “Waay: Music theory that matters” is now available. Click here to learn about its video lessons, interactive exercises, progress-tracking tools, and more.]
What’s the fruency of C, and why should you care?
It’s 261.6 Hz. Why would we ever need to know this? Well, there could be a few different reasons, but one has to do with mixing audio. Whenualizing ( ing) an audio track, one common challenge is filtering out background noise—especially if the track was recorded with a microphone. Here’s what the mic might be picking up:
* The rumble of a streetcar or truck going by in the distance
* An accidental knock of the microphone stand
* A door closing somewhere in your building
Your best route to eliminating background noise is to cut it out at the source, but in many cases (barring time travel) that’s just not possible. So we use anualizer, or , to lend a helping hand.
Take a guitar track for example. What’s the lowest sound you’d expect to come from a guitar? If it’s in standard tuning, the lowest string is tuned to E2, which has a fruency of 82.4 Hz (see the table below). This means that any sound below ~80 Hz is not guitar. So, if we filter out everything below that fr uency, we cut out the low noise (like the streetcar rumble) but keep all that great guitar sound. Not bad! The name for this kind of filter is ahigh-pass filter, because it lets all the high fr uencies pass—and keeps out the low ones.
Below is a table of all the note fruencies, with the highest and lowest notes of various instruments highlighted. The first column is the octave number. For example, the low E string on a guitar is tuned to E2—that’s E in the 2nd octave.
Bio: Alex Andrews is an engineer, musician, and runs Ten Kettles Inc in Toronto, Canada. Ten Kettles is an indie app company that builds apps for music education. Their newest app, “Waay: Music theory that matters,” brings together video lessons, interactive exercises, and progress-tracking tools to teach music theory for songwriters. You can find out more here.
[Picture of console from Shutterstock.]
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