Technical Addendum
Updated: 05/18/2006
The TV Broadcast Signal
transmitted
at some sort of maximum power and black is just the opposite-a minimum signal.
Not so; in fact, it's just the opposite.
In the transmission process the brighter something is in a scene, the lower the amplitude of the modulated video signal becomes. This explains an audio problem that sometimes occurs.
Since this happens at the field rate of 60 times a second, when the audio loses its reference in this situation, you end up with a very annoying audio buzz.
This problem typically occurs with TV graphics that contain contrasty lettering-for example, gold lettering on a dark background.
