Sound
Similarly, a source of sound can have many different frequencies mixed. A musical tone's timbre is characterized by its harmonic spectrum. Sound in our environment that we refer to as noise includes many different frequencies. When a sound signal contains es, distributed equally over the audio spectrum, it is called white noise.
Read more about this topic: Frequency Spectrum
Famous quotes containing the word sound:
“There is a silence where hath been no sound,
There is a silence where no sound may be,
In the cold grave—under the deep, deep sea,
Or in wide desert where no life is found,”
—Thomas Hood (1799–1845)
“It was the unfailing and characteristic sound of those lakes.”
—Henry David Thoreau (1817–1862)
“He’s made a harp of her breast-bane,
Whose sound wad melt a heart of stane.
He’s ta’en three locks o’ her yellow hair,
And wi’ them strung his harp sae rare.”
—Unknown. Binnorie; or, The Two Sisters (l. 41–44)