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:
“But one sound always rose above the clamor of busy life and, no matter how much of a tintinnabulation, was never confused and, for a moment lifted everything into an ordered sphere: that of the bells.”
—Johan Huizinga (1872–1945)
“One of those sound slumbers which, lasting in reality some half hour, seem to the sleeper to have been protracted for three weeks or a month.”
—Charles Dickens (1812–1870)
“It was the unfailing and characteristic sound of those lakes.”
—Henry David Thoreau (1817–1862)