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 Sound of battle fell upon my ear & heart all day yesterday—even after dark the cannon’s insatiate roar continued ...”
—Elizabeth Blair Lee (1818–?)
“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)
“Therefore when thou doest thine alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, they have their reward. But when thou doest alms, let not thy left hand know what thy right hand doeth.”
—Bible: New Testament Jesus, in Matthew, 6:2-3.
From the Sermon on the Mount.