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| Things
To Do (page 83) |
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1(a)
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Analogue
can have lots of in-between values whereas digital data jumps
from one value to another without any in-between value. |
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(b)
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(i)
(ii) |
It will be measured in revolutions per min which is a whole
number value.
Analogue to digital converter to convert the analogue temperature
signal to a digital signal. |
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2(a)
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(i)
(ii)
(iii) |
There
is no need to re-type so it is cheaper. No errors are introduced
due to re-typing. Fast to produce the finished book.
Cheaper to post than a mass of paper. Much cheaper to keep a
copy of the disk than a copy on paper.
Publisher gets the file as soon as they log on to read their
e-mail. Can be almost instantaneous. Do not need to parcel up
and post. |
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(b)
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So
that the publisher can make sure that they can covert the file
to a format that they can use on their system. |
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| Examination
Questions (page 337) |
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1(a)
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(i)
(ii) |
Less storage space on the hard disk is needed. Files take less
time to be transferred over a network./the Internet. Easier
to take backup copies.
Files need to be decompressed before they can be viewed. Takes
time to decompress the files. Need special software to compress
and decompress the files. |
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2(a)
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Before
conversion: An analogue signal should be drawn. After conversion:
A digital signal should be drawn. |
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(b)
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Use a sound card. Add stereo speakers. Use 16/32 bit sampling.
Add an external amplifier. |
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(c)
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Games,
video clips., cartoons, error message sounds, voice mail etc.
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