To enhance and evenly radiate the vibration energy of a soundboard passed from strings in the whole frequency band, the peak shapes of the

fundamental tone and harmonics need to change gradually, thus producing a smooth envelope curve (Liu 2004).

Although the

fundamental tones for each mosquito didn't change very much during a "fly by"--females still produced a fundamental 400-hertz tone and males a 600-hertz tone--each mosquito produced a faint harmonic note, right around 1,200 hertz, that was closely in sync.

We rarely hear a pure

fundamental tone either in music or in nature.

According to his further considerations, as a main element of the durational time-realm, a "fundamental phase" (Grundphase) therefore corresponds to a

fundamental tone, as a main element of the pitch time-realm.

Like a bell that rings only in a

fundamental tone and certain harmonics, the Earth vibrates with discrete frequencies.

The third-order intercept point, IP3, is the theoretical intersection of the

fundamental tone and the third-order tone, and is a measure of linearity.

The Nyquist plot is nearly periodic with a period equal to the

fundamental tone.

33 dBc greater than the highest remaining

fundamental tone.

For the complex numbers that delineate the

fundamental tones whose symphony is the accumulation of primes are precisely those complex numbers that bring Riemann's zeta function to zero.

Within the harmonic generator, a substraction circuit is included to cancel the

fundamental tones in order to get only the 1M3 and IM5.

But move the

fundamental tones into the ultrasonic range, say 40 and 41 kHz.