|
So... ...What's
so good about DIGITAL television? |
|
It is important to understand the advantages
of digital transmissions, over analogue transmissions.
Here is a brief explanation (without getting
technical)...
|
Imagine
listening to a gramophone record. Under normal circumstances,
the quality is good, but when the record is worn, or damaged,
you will hear a reduction in sound quality of the actual recording
as well as hiss and clicks etc.
Similarly, with analogue television signals, any signal that
is subject to being either too week or on a similar frequency
to a source of interference will display faults in the television
picture in the form of grainy picture, speckles on the screen
and even a double image (ghosting). |
|
| |
|
| |
Imagine
listening to a compact disk (CD). Under normal circumstances
the quality is excellent, but when the CD has been damaged, is
faulty or dirty, you will not hear a reduction in sound quality
of the recording or hiss. Instead the recording, still in perfect
quality will skip, jump and stutter.
Similarly, with digital television signals, any signal that is
subject to being week will still display a prefect picture, but
the picture will occasionally freeze and break up into strange
squares etc. (this is called pixilation - when the picture pixilates
or brakes up into pixels).
The problems that cause ghosting or speckles on the screen DO
NOT affect digital pictures. |
|
| |
|
|
|
|