2007-07-09 05:19:03 · 2 answers · asked by shepsterno1 1 in Consumer Electronics ➔ TVs
I'm assuming you mean what is commonly known as "ghosting" (the same image as the picture shifted over slightly to one side). It's due to multipath interference, where the primary signal you are receiving direct from the transmitter is mixing with a reflection (from buildings, mountains, or other objects) of the same signal; since the two versions of the signal are traveling a different distance they are shifted in time at your receiver causing this type of interference.
The answer to this is a more directional antenna that can be directed towards the primary signal.
2007-07-09 06:08:55 · answer #1 · answered by Anonymous · 1⤊ 0⤋
By "pre-image" are you referring to the effect on some plasma screens whereby if you watch the same channel repeatedly, areas of the picture that do not change appear to "burn in" on the screen? News channels with tickers running along the bottom of the screen, station idents etc. are the biggest offenders.
It's caused by pixels deteriorating due to over-use.This has now been eliminated in the latest generation of plasma TVs.
2007-07-12 17:34:32 · answer #2 · answered by Michael B 6 · 0⤊ 0⤋