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:
“[T]here is only one sound argument for democracy, and that is the argument that it is a crime for any man to hold himself out as better than other men, and, above all, a most heinous offense for him to prove it.”
—H.L. (Henry Lewis)
“The sound of laughter is like the vaulted dome of a temple of happiness.”
—Milan Kundera (b. 1929)
“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.)