Generally, harmonic sounds are those for which we hear
a pitch (you can hum them).
Scientific pitch notation combines a note name with an
octave number:
- C4 is middle C;
- A4 or A440 (440 Hz) is in the same octave (above) middle C
and is often used as a reference tone.
Recall, in equal-tempered tuning, there are 12 evenly spaced tones
(semitones) in an octave,
- The frequency
semitones above/below A440 is
![$\displaystyle 440 \times 2^{\pm n/12}$](img6.png)
Hz
``Music 171: Amplitude Modulation''
by Tamara Smyth,
Department of Music, University of California, San Diego (UCSD).
Download PDF version (am171.pdf)
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Copyright © 2019-11-05 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<trsmyth@ucsd.edu>