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Written by Kevin Cantera
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Wednesday, 27 February 2008 |
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Word Count: 578 Digital Signals Goodbye to Analog
As this first decade of the 21st Century draws to a close, so also does the
age of analog. When it comes to communications, analog has served humanity long
and well, but the old technology is being phased out by governments and
manufacturers alike, and within ten years, the old analog systems will likely be
a technological footnote to history. Put simply, analog equipment cannot compete
with the capacity of digital and, as a result of simple economics, it is
destined to dwindle away. Of course, analog systems made sense when first
created, for analog signals are able to duplicate virtually any natural
phenomena, such as sound or light, which are analog inherently because they are
infinitely variable.
With analog systems of communications, the biggest problem has always been
noise. While analog offers the infinite variability that replicates the natural
state of sound or light, converting those phenomena into an electrical signal
and then back again into a sound or an image creates “noise.” The term is used
because it can literally produce noise in an audio system – the hiss or rumble
that is heard in poor quality recordings. Noise also shows itself in the grain
or “snow” that can trouble a TV signal. Noise affects an electronic signal at
every stage of the communications process, and its effects add up.
Although a digital signal cannot directly represent an analog quantity,
everybody know that a digital device like and Mp3 player offers excellent
quality duplication of sound, which is, in fact, an analog phenomenon. The
process by which a digital signal duplicates an analog quantity is called
encoding, or just simply coding. Encoding allows the digital representation of
analog quantities – an area of infinite variability – by using a binary system
that creates an on-off switch for all those variables (theoretically). This use
of digital signals gives a major improvement in noise reduction.
Noise affects the inherent value of a signal, whether it is digital or analog,
but on an analog signal the noise has an impact on the value of that signal,
because increased voltage over an analog signal creates distortion. When an
analog signal is recorded, it is inevitable that noise is recorded along with
it. If it is then re-recorded, the original noise is indistinguishable from the
original signal, and becomes, effectively, part of the new signal. At each
recording stage, extra noise will be introduced into the system and multiple
copying of an analog signal ultimately results in an unacceptable loss of
quality, called generation loss.
When a digital signal is recorded, it too will include noise picked up within
the system. However, a digital signal is clearly identifiable, despite any noise
the signal picks up. At the root of the digital advantage is the fact that the
signals in a digital system do not have to be accurate. A voltage only needs to
be readable as a one or a zero to be processed. Thus, digital communications
signals offer possibilities which have no equivalent in analog systems.
Author Kevin Cantera, a free lance writer in Utah, writes about the revolution in technology from using analog to digital signals that has improved upon quality, noise reduction and much more. Best example in digital communication is video phone. For more information on free cell phone video, mobile video sharing, phone video sharing, please visit www.vringo.com.
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