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Analog vs Digital Transmission
By: Gary Davis, Sat Dec 10th, 2005 12:42:34 AM


Analog vs Digital Transmission
By Gary Davis

Webmasters: You may reprint this article in its entirety, providing you
leave the Byline and About the Author sections intact, including the
links to Dish Network Satellite TV. Remember the old days of analog TV,
radio, etc. Most of us do unless you?re really young. And still today
there are plenty of analog systems in use. Normal radio still uses
analog transmission. But the digital age has begun and more and more we
will use digital systems rather than analog systems. Digital
transmission systems have many advantages over analog transmission
systems, like higher quality of audio and video. How come digital
systems can transmit higher quality signals than analog systems? The
truth is that they don?t. They just use some tricks to eliminate noise.

Analog Transmission
(Article continued below)

When something like video and audio, is recorded by an analog system,
the recording has a certain quality. This recording (when done
professionally) has a very high quality. When the recording is
transmitted it is modulated directly to a carrier wave, which is then
transmitted through the air, cable, via satellite, etc. During this
transmission, the carrier and the modulated signal will loose amplitude
(power) and due to interference noise is introduced to the carrier and
its modulated signal. The result will always be a received signal that
has a lower quality than the transmitted signal. Hence, the modulated
signal, the recording, will also be of lower quality than the original.

Analog transmission systems are unable to maintain the quality the
original has.

Digital Transmission Systems

In the digital world the recording can be transmitted to another place
without loosing any quality. An exact copy of the original recording is
transmitted. So how come that digital transmission systems don?t loose
quality when transmitting a signal?

Well..... Actually they do lose quality just like the analog
transmission system does.

Surprised? No Problem. Most people don?t know that digital signals
still need to be transmitted by analog transmission systems. The trick
is that a digital system doesn?t record analog signals, but encodes
analog signals into bits (zeros and ones). A sample is taken many times
per second and the size of each sample is written down in bits. For
instance a sample with the value of 9 would be 1001 and 11 would be

The digital transmission system needs to transmit those zeros and ones,
and it does this by modulating the carrier wave. Low power for a 0 and
high power for a 1 (This is the most simple way of modulating. There
are much more sophisticated forms of modulation, but it would take a
whole book to describe them all.)

So on the receiving end, it doesn?t matter anymore what the quality of
the signal is, as long as it still is possible to identify the zeros
and ones. Noise in the received signal is no problem. A ?1? with noise
is still a ?1? and a ?0? with noise is still a ?0?. Of course the noise
can not be too high, otherwise mistakes would be made and a zero would
be received as one or a one would be received as a zero.

So Digital Transmission Systems are better because they eliminate the
effect of noise completely. You don?t look and listen to a received
signal from an original recording, but you look and listen to a
reproduced signal of the recording. The reproduction comes from an
exact copy of the original recording.

The quality of what you see and hear now depends on your TV and Sound
System. A high quality TV and Sounds System will give you high quality
Video and Audio. The negative effects of the (still analog)
transmission have been eliminated from the process.

Satellite TV makes use of Digital Transmission Systems. What you see at
home will always be of Digital no (much less) noise Quality.

About the author: Gary Davis is owner of Dish Network Satellite TV, has
several years experience in the Satellite TV Industry and has written
several articles on satellite TV.

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Re: Can Google Really Deliver Country Specific Searching? wrote:
Quoted text here. Click to load it

<garbage snipped>

Why would I want to?

And even if it were applicable, why would I want to support a spammer?

Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.

Re: Can Google Really Deliver Country Specific Searching?

On 10 May 2006 00:01:28 -0700, wrote:

Quoted text here. Click to load it

What a load of crap!

Poorly written and technically even worse.

Matt Probert
Former broadcast engineer

Re: Can Google Really Deliver Country Specific Searching?

Matt Probert wrote:
Quoted text here. Click to load it

You too, Matt?

I still maintain my broadcast license.  Figure it's something I can use as a
hobby in my retirement :-).

Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.

Re: Can Google Really Deliver Country Specific Searching? wrote:

Quoted text here. Click to load it

Ha? Charlie Ergen is a founder and CEO of EchoStar, Dish Networks parent

In a single spam message how can you get so many things wrong: title, body
and the targeted keyword (recipe?) all mismatch. Not even mentioning the
factual discrepancies...

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