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:
“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 freedom to make a fortune on the Stock Exchange has been made to sound more alluring than freedom of speech.”
—John Mortimer (b. 1923)
“There was a sound of revelry by night,
And Belgium’s capital had gathered then
Her beauty and her chivalry, and bright
The lamps shone o’er fair women and brave men;
A thousand hearts beat happily; and when
Music arose with its voluptuous swell,
Soft eyes looked love to eyes which spake again,
And all went merry as a marriage-bell;
But hush! hark! a deep sound strikes like a rising knell!”
—George Gordon Noel Byron (1788–1824)