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:
“Envy awakens at the sound of a distant laugh.”
—Mason Cooley (b. 1927)
“A person is far more likely to appear to have sound character because he persistently follows his temperament than because he persistently follows his principles.”
—Friedrich Nietzsche (1844–1900)
“Is there no hope for me? Is there no way
That I may sight and check that speeding bark
Which out of sight and sound is passing, passing?”
—Paul Laurence Dunbar (1872–1906)