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:
“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)
“Today we seek a moral basis for peace.... It cannot be a lasting peace if the fruit of it is oppression, or starvation, cruelty, or human life dominated by armed camps. It cannot be a sound peace if small nations must live in fear of powerful neighbors. It cannot be a moral peace if freedom from invasion is sold for tribute.”
—Franklin D. Roosevelt (1882–1945)
“The old coat that I wear is Concord; it is my morning robe and study gown, my working dress and suit of ceremony, and my nightgown after all. Cleave to the simplest ever. Home,—home,—home. Cars sound like cares to me.”
—Henry David Thoreau (1817–1862)