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:
“A system of morality which is based on relative emotional values is a mere illusion, a thoroughly vulgar conception which has nothing sound in it and nothing true.”
—Socrates (469–399 B.C.)
“Surely the only sound foundation for a civilization is a sound state of mind.”
—E.M. (Edward Morgan)
“The hills are alive with the sound of music, with songs they have sung for a thousand years.”
—Oscar Hammerstein II (1895–1960)