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Tones, overtones, harmonics, and partials

The base, or core, frequency of a sound is known as its fundamental tone.

The waveforms of all sounds, apart from a basic sine wave, consist of the fundamental tone and many other tones of different frequencies.

Non-fundamental tones that are whole-number multiples of the fundamental tone are known as overtones or harmonics. A tone with a frequency that is a fraction of the fundamental tone is referred to as a subharmonic.

  • The fundamental tone is referred to as the first harmonic. This is generally louder than the other harmonics.

  • A tone played at twice the frequency of the first harmonic is called the second harmonic.

  • A tone played at four times the frequency of the first harmonic is called the fourth harmonic, and so on.

Each of these harmonics has a timbral quality that is different from that of the fundamental tone. In general, harmonics that can be multiplied or divided by a whole number, such as octaves, odd-numbered or even-numbered harmonics, and so on, sound more “musical.”

Tones that cannot be multiplied or divided by a whole number are known as inharmonic overtones, or partial tones. When you combine a number of these inharmonic overtones, it tends to sound “noisy.”

Non-fundamental tones that are multiplied by fractional amounts—not whole numbers—are called partials.

Download the guides:

Logic Pro User Guide: PDF

Logic Pro Instruments: PDF

Logic Pro Effects: PDF

Control Surfaces Support Guide: PDF

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