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:
“The hills are alive with the sound of music.”
—Oscar Hammerstein II (1895–1960)
“The last sound on the worthless earth will be two human beings trying to launch a homemade spaceship and already quarreling about where they are going next.”
—William Faulkner (1897–1962)
“One dreadful sound could the Rover hear,
A sound as if, with the Inchcape Bell,
The Devil below was ringing his knell.”
—Robert Southey (1774–1843)