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Bryan_6554
#1 Posted : Sunday, June 27, 2021 9:45:55 PM
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Hey Forum,

I was looking over my notes and noticed that the beat frequency equation is different from the one I previously learned. I've known it as fbeat = |f2-f1|, but it's written as fbeat = |f1-f2|. Is this to compensate for the +/- frequency when solving for either f2 or f1?

Warm regards,
Bryan
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INSTR_Katrina_128
#2 Posted : Tuesday, June 29, 2021 4:59:12 PM
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Hi Bryan,

Yes.

But, notice the absolute value signs (the vertical bars)? Thus, it doesn't matter the order in which the math is done.

So if we say that f1 = 100 Hz and f2 = 110 Hz,

Then, f1 - f2 or f2 - f1 will result in -10 Hz and 10 Hz, respectively, and |f1 - f2| and |f2 - f1| are BOTH equal to 10 Hz. So, the equations are the same thing! 😀

Overall, the beat frequency formula tells you the MAGNITUDE (or the +/-, like that said).
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