Howtosignalprocessing
Static is due to irregular signals which cover a broad range of frequencies. Each signal is not just one wavelength only but is made up of all wavelengths, the reason why it appears white. If the signal is weak, then it is grayish. If there is no signal, then it is black.
- Is TV static considered white noise?
- Why does TV static sound like that?
- Why is TV static black and white?
Is TV static considered white noise?
White noise is defined as a random noise with a uniform frequency spectrum over a wide range of frequencies. You may consider white noise the sound of TV static, a fan, or the hum of an air conditioner. While white noise is a specific frequency, these things do have a very similar sound and use.
Why does TV static sound like that?
When the TV is tuned to a channel for which there is no nearby broadcaster, the screen shows a lot of static. The static – also known as noise – is caused by random radio waves coming towards the TV from various manmade and natural sources, including deep space.
Why is TV static black and white?
The chroma is at ~4.4MHz offset from DC and is about 1.3 MHz wide. Assuming that your noise is centered around DC then, if it is less than ~3.5MHZ wide then it won't appear in the chroma spectrum and will only be in the luma. Hence you see the noise as appearing in black and white.
