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:
“There is no legislation—I care not what it is—tariff, railroads, corporations, or of a general political character, that all equals in importance the putting of our banking and currency system on the sound basis proposed in the National Monetary Commission plan.”
—William Howard Taft (1857–1930)
“A village seems thus, where its able-bodied men are all plowing the ocean together, as a common field. In North Truro the women and girls may sit at their doors, and see where their husbands and brothers are harvesting their mackerel fifteen or twenty miles off, on the sea, with hundreds of white harvest wagons, just as in the country the farmers’ wives sometimes see their husbands working in a distant hillside field. But the sound of no dinner-horn can reach the fisher’s ear.”
—Henry David Thoreau (1817–1862)
“I am already kindly disposed towards you. My friendship it is not in my power to give: this is a gift which no man can make, it is not in our own power: a sound and healthy friendship is the growth of time and circumstance, it will spring up and thrive like a wildflower when these favour, and when they do not, it is in vain to look for it.”
—William Wordsworth (1770–1850)