Sound, Images, Binary and Hexadecimal

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  • Created by: chaz_2191
  • Created on: 17-11-21 10:40
What is the equation for working out the size of a sound file?
The file size of a sample = sample rate x sample resolution x number of seconds
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What is the equation for working out the file size of an image?
Size in bytes = (width x height x colour depth) / 8 bits
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What is colour depth?
Colour depth is the number of bits per pixel.
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How do you work out the colour depth of an image?
Convert the number of colours to
a power of 2.
For up to:
2 = 21 colours 1 bit is required
4 = 22 colours 2 bits are required
8 = 23 colours 3 bits are required
256 = 28 colours 8 bits are required
65,536 = 216 colours 16 bits are required
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What is a character set?
The character set is the 8 bits per character.
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How many characters can be represented with the 7-bit ASCII character set?
128
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How can values greater than 255 be represented in binary?
You need to add another bit.
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What is the effect of the logical right shift in binary?
The number gets divided by two.
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What is the effect of a logical left shift of three places?
The number would be increased by three powers.
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How do you convert denary 19 to hexadecimal?
19/16 = 1 remainder 3
So the hexadecimal would be 1/3
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Name two forms of compression
Lossy and Lossless
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State an advantage and disadvantage of lossy compression
It's faster, but you can't get back all the data you started with.
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State an advantage and disadvantage of lossless compression
It takes longer, but you can retrieve all the data you started with.
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Is Run Length Encoding lossy or lossless compression?
Lossless as it is not losing any of the original data.
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Explain the relationship between quality of playback and file size.
The higher the quality of playback, the higher the file size. This is because, in order to get a better recording, you have to include more samples, and more samples increases the size of the file.
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A short sound file has 10 samples - What is the frequency?
10Hz
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Represent 42 in hexadecimal
42/16 = 2 remainder 10
So the hexadecimal would be 2A
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Other cards in this set

Card 2

Front

What is the equation for working out the file size of an image?

Back

Size in bytes = (width x height x colour depth) / 8 bits

Card 3

Front

What is colour depth?

Back

Preview of the front of card 3

Card 4

Front

How do you work out the colour depth of an image?

Back

Preview of the front of card 4

Card 5

Front

What is a character set?

Back

Preview of the front of card 5
View more cards

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