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WorksheetsUnit 8 - Representing Images, Sound & Text
Total questions: 10
Worksheet time: 6mins
Which of these would have a larger file size?
Image A: 200 x 200 pixels, 16 colours
Image B: 800 x 200 pixels, 2-bit colour depth.
Image A
Image B
How many bits per character are used in ASCII?
5
7
8
16
How many bits per character are used in Extended ASCII?
7
8
16
32
An audio recording last 10 seconds and is recorded at 48KHz. It uses a sample resolution of 16-bit.
Calculate the minimum file size of this recording. Give your answer in KB.
(to help auto-marking, do not state units in answer)
(a)
The ____________ of a recording is a measure of the number of samples being taken per second.
sample rate
sample resolution
bit rate
sample speed
What is the term given to the number of bits used to store each sample in an audio recording?
sample rate
sample resolution
bit rate
sample speed
What term is given to the number of bits used to represent each pixel in an image?
Resolution
Colour Depth
Colour Size
Bit Quality
Text messages used to have a limit of 160 characters. Assuming they used the Extended ASCII character set, what is the largest size of message, in bits, that could be sent?
(a)
What is the name of the device that takes analogue sound and converts it into binary usable by a computer?
ADC
DAC
Microphone
Speakers
Read the description below of how a singer might record a their voice and store it digitally.
State whether this description is ACCURATE or INACCURATE.
"A microphone would first turn the changes in air pressure created by the singer's choice into electrical voltages. An analogue-to-digital convert would then take measurements (samples) of these voltages at set intervals. The rate at which these samples is taken is determined by the sampling rate, measured in Hz. Each sample is then converted into binary, the number of bits per sample being determined by the sample resolution."
Accurate
Inaccurate
