Design
Most modern white noise generators are electronic, usually generating the sound in real-time within audio test equipment, or via electronic playback of a digital audio recording.
Simple mechanical machines consist of a very basic setup, involving an enclosed fan and (optionally) a speed switch. This fan drives air through small slots in the machine's casing, producing the desired sound.
When tuned to an unused broadcast frequency, a television set or a radio will pick up the random cosmic background noise on that frequency and render it through its speaker as white noise.
Read more about this topic: White Noise Machine
Famous quotes containing the word design:
“To nourish children and raise them against odds is in any time, any place, more valuable than to fix bolts in cars or design nuclear weapons.”
—Marilyn French (20th century)
“Joe ... you remember I said you wouldn’t be cheated?... Nobody is really. Eventually all things work out. There’s a design in everything.”
—Sidney Buchman (1902–1975)
“Nowadays the host does not admit you to his hearth, but has got the mason to build one for yourself somewhere in his alley, and hospitality is the art of keeping you at the greatest distance. There is as much secrecy about the cooking as if he had a design to poison you.”
—Henry David Thoreau (1817–1862)