why do some TVs show static when there’s no signal?
In: Technology
TV receivers have to pick out packets of information from a certain level of background noise (constant interference from other technology in the area). To do this, it looks at the difference in amplitude between good signals and bad signals.
When the signal is weak, it is more difficult to distinguish good packets of data from random noise, and so more bits of noise end up slipping into the signal that ends up on your screen. When there is no signal altogether, it simply shows you the ambient noise the receiver is picking up, amplified to a level that your decoder is able to read and display.
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