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The advantages by
switching from Analogue to Digital many. The transportation
(transmission) and storage of digital signals more noise tolerant
then for an analogue.
Besides makes the
digitalization it possible to use software for compression (such
as MP3, MPEG4) and encryption.
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We live in a world "polluted" with electric
noise. If not guarded properly, will this noise be added to
analogue signals and can only be removed by a filter - fitted for
the purpose.
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If noise and signal share the same frequency
range, will the filter process be difficult. |
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Digital signals are by nature "just"
analogue signals, with two possible values ('0' and '1') and hence
will electric noise also be added.
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However will a digital component accept a
difference between the output and the input levels (called noise
margin) and hence will the filter process be done automatically
each the signal pass through a gate. |
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CMOS technology known to have logic-level
symmetric around the half supply voltage
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TTL technology not symmetric (consult
textbooks for more details) |
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