2007-06-11 09:48:37 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
It's white noise because there are frequency components spread equally across a band, from near 0 Hz to some number. If it's an audio source of noise, it would be called white noise if it extended above 20 kHz. For microwave circuits, it may need to extend to 18 GHz or above.
The word "white" is from the light analogy. The sun emits equal amounts of energy across the visible spectrum.
2007-06-11 09:55:17 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Because it contains the same amount of spectral energy within an octave, no matter where that octave is located.
There are some really excellent application notes on noise, noise types, and noise measurement on National Semiconductors website.
Doug
2007-06-11 16:55:40 · answer #2 · answered by doug_donaghue 7 · 0⤊ 0⤋
great question. white noise rises at 3dB/oct....pink noise is equal energy per octave.....johnson noise is the noise produced by plants growing (cell generation and expansion) ref:the secret life of plants (book). there are other kinds of noise also...aien't science great?
2007-06-11 16:55:52 · answer #3 · answered by Anonymous · 0⤊ 0⤋