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:
“Like many of the Upper Class He liked the Sound of Broken Glass.”
—Hilaire Belloc (1870–1953)
“The hills are alive with the sound of music, with songs they have sung for a thousand years.”
—Oscar Hammerstein II (1895–1960)
“There was a sound of revelry by night,
And Belgium’s capital had gathered then
Her beauty and her chivalry, and bright
The lamps shone o’er fair women and brave men;
A thousand hearts beat happily; and when
Music arose with its voluptuous swell,
Soft eyes looked love to eyes which spake again,
And all went merry as a marriage-bell;
But hush! hark! a deep sound strikes like a rising knell!”
—George Gordon Noel Byron (1788–1824)