For M1, as an extension of P2, learners must compare analogue and digital signals. The comparison should contain clear understanding of both types of signal, and relate analogue and digital clearly.
Introduction
In this report I am going to explain how analogue and digital signals work, I
will also be mentioning some examples with the strengths and weaknesses of
these signals. Finally to end this report I will be comparing both of the signals
and what is better to use.
Analogue Signals
Analogue signals are electronic based. The signals are continuous in
frequency which means it will not stop until it is told to do so, furthermore
these signals are original which means is not altered or edited. These signals
are used in cassettes, tapes, Vinyl Records, AM-FM Radios, Analogue TV’s and
even our own voices are a type of analogue signal. The signal normally has a
good range as you can see in the diagram below it is represented by wave
lengths, some lines bigger than the others, this is because the smaller lines
have a lower pitch sound and the longer lines have a higher pitched sound.
Strengths and Weaknesses
The strengths of this kind of signal it is very portable and costs less to maintain.
Another strength would be you don’t need a computer to store this type of
signal. The weaknesses would be you can always get a clear signal if the
frequency is not tuned right that’s why sometimes you can hear distortion,
also if the signal is stored in a cassette tape and you re-record that onto
another tape, the quality will reduce with each copy.
Digital Signals
Digital signals are not a continuous signal because they are stored for
computer processing which means if you broke it down it would be binary
which is represented by 0 and 1’s. Some examples of digital signals cane be
CD’s, digital TV, alarm clock and DAB Radios. Unlike analogue signals and
wave lengths, digital signals are measure in samples for example a CD that
has 55,000 samples can also be known as (55 KHz).
Strengths and Weaknesses
This can be very useful when copy files that store digital signals because all
the electronic device has to do is read the numbers to play it which means
the signal quality will stay the same and there is no noise however this is also
one of the advantages of this type of signal, if any of the binary numbers
cannot be read the signal will automatically stop playing. Another weakness
would be that the signal can be stored in a magnetic device which can
easily get damaged and break.
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