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With a number of commercials
about HD Channels, HD Recorders, HDTV etc people are tempted to go for HD without much
knowledge about it. Hence some of them complain about poor picture quality even
though their TV set is HDTV. Why is it so?
HD or high definition is the top
tier of DTV i.e. Digital TV. Digital TV unlike analog TV works on digital
signal of zeroes and ones whereas analog works on wave principle. Remember that to experience HD you will at least need the following.
1 HD broadcasting station: The signal
coming into your TV must be HD, for that the signal transmitted from the
broadcasting station must be HD. When a particular channel has a HD tag then
you can be sure of the fact that the broadcast of that channel is of HD mode.
2 HD Receiver: Either your cable operator
should have a HD receiver i.e. a HD set top box or you yourself must have a
digital signal receiver at home to decode the digital signal being broadcasted.
3 HDTV: This is where the necessity of HDTV clicks in
to see the progressive scan image of the received signal.
1
Next, we learn the basic
difference of an analog TV and HDTV.
An analog TV works on interlacing.
The pictures we see in our television set are a set of frames of images which
are moved very fast to create a motion of picture, hence a moving picture
results. Interlacing increases the frame rate by consuming the same bandwidth
of received signal. Cathode Ray Tube
(CRT) is capable of displaying interlaced signals.
Digital TV uses progressive scan
technology. In interlacing the frames are created by alternate odd and even
line of pixel whereas in progressive scan technology all the pixel line are
created sequentially. Analog TV has a standard aspect ratio of 4:3, 16:9 for
digital TV. Aspect ratio is the standard width by height ratio of the image in
a television.
You must have seen the tag 1080i or 1080p. It means that the
screen resolution is 1920 X 1080 interlaced or progressive. Such a high
resolution is available in HD transmission alone. When an analog broadcasting
signal is viewed in a digital TV, then a poor picture quality is witnessed,
that is because the broadcasted signal is in the ration 4:3 viewed in a TV of
ratio 16:9.
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