1. The main advantage
of digital signals
signals is that the precise signal level of the
digital signal is not vital. This means that digital signals are fairly immune
to the imperfections of real electronic systems which tend to spoil analog
signals. As a result, digital CD's are much more robust than analog LP's.
2. Codes are often
used in the transmission of information. These codes can be used either as a
means of keeping the information secret or as a means of breaking the
information into pieces that are manageable by the technology used to transmit
the code, e.g. The letters and numbers to be sent by a Morse code are coded
into dots and dashes.
3. Digital signals
can convey information with greater noise immunity, because each information
component is determined by the presence or absence of a data bit (0
or one). Analog signals vary continuously and their value is affected by all
levels of noise.
4. Digital signals can be processed by digital circuit
components, which are cheap and easily produced in many components on a single
chip. Again, noise propagation through the demodulation system is minimized
with digital techniques.
5. Digital signals do
not get corrupted by noise etc. You are sending a series of numbers that
represent the signal of interest (i.e. audio, video)
6. Digital signals
typically use less bandwidth. This is just another way to say you can cram more
information (audio, video) into the same space.
7. Digital can be encrypted so that only the intended
receiver can decode it (like pay per view video, secure telephone .
8. Enables
transmission of signals over a long distance.
9. Transmission is at a higher rate and with a wider
broadband width.
10. It is more secure.
11. It is also easier to translate human audio and video
signals and other messages into machine
language.
12. There is minimal electromagnetic interference in digital
technology.
13. It enables multi-directional transmission
simultaneously.
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