Digital TV requires a computer in the tuner (the TV or the converter box) to pick up the data coming in on the channel & convert that data into a picture and sound.
The tuner is basically a very specialized computer that changes digital signals into analog signals we can understand.
The new digital format had about 4 times as many little dots, and perhaps more in wide screen, so it gets very, very much data that it needs to convert.
A cheaper TV or converter box is made with a cheaper, slower computer as it's brain, and so it takes longer for it to 'build' the picture we see.
Most digital pictures seem to be delayed about 2 seconds in digital, compared to analong.
This is the computer taking time to gather all the data and transform it into a picture we can understand.
As well, if you have a poorer signal, it takes longer for the computer to figure out the good data from the bad data, and 'lock on' to the digital signal.
And thus, the delay.
Some of the real expensive TVs with a double speed (120hrz) computer are much quicker at this.
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