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:
“The reason American cars don’t sell anymore is that they have forgotten how to design the American Dream. What does it matter if you buy a car today or six months from now, because cars are not beautiful. That’s why the American auto industry is in trouble: no design, no desire.”
—Karl Lagerfeld (b. 1938)
“Teaching is the perpetual end and office of all things. Teaching, instruction is the main design that shines through the sky and earth.”
—Ralph Waldo Emerson (1803–1882)