WorksheetsAQA GCSE Computer Science - 3.3.7 Representing Sound
Total questions: 20
Worksheet time: 7mins
Are analogue and digital sounds continuous or discrete
Analogue is continuous, Digital is discrete
Both are continuous
Analogue is discrete, Digital is continuous
Both are discrete
What does ADC stand for?
Analogue-to-Digital Converter
Alternating Direct Current
Analogue Data Compression
Arithmetic Data Calculation
What is sample resolution?
The accuracy of the amplitude used to to record each measurement
The accuracy of the wavelength used to record each measurement
The the accuracy of the period used to record<br />each measurement
The accuracy of the wave speed used to record each measurement
What is the file size of a 3-second long recording with a resolution of 4 bits at 8 samples per second?
12 bytes
6 bytes
12 bits
6 bits
What is the range of human hearing?
20-20,000Hz
20-20,000kHz
20-19,998Hz
20-19,998kHz
What does lossy compression usually do (to audio recordings)?
Remove unecessary sound from outside the range of human hearing.
Leave out repeated data.
Reduce the sample resolution
Reduce the sample rate
What type of file would a .wav format be used for?
Uncompressed files
Lossy compressed files
Losslessly compressed files
Any compressed file
How long is a 16 byte recording with a resolution of 8 bits at 16 samples per second?
1 second
2 seconds
4 seconds
8 seconds
How is sound digitised?
By repeatedly measuring an analogue sound wave.
By using a diaphragm.
By converting the sound into MIDI note values.
The sound causes the computer to resonate with it.
What determines how often a digital wave can change.
Sample frequency
Sample speed
Sample length (seconds)
Sample resolution
Which of these is likely to have the smallest file size?
.MP3
.WMA
.WAV
.M4A
Which of the following is true?
Higher bit rate = better quality
Higher bit rate = worse quality
Lower bit depth = better quality
Lower bit depth = higher sample rate
What is sample rate?
The number of samples recorded per second
The number of bits used to record each sample
How much data is processed for each sample
How many waves appear
Which of these is a lossy compression format
.MP3
.WAC
.AAC
.OGG
What does lossless compression do?
Leaves out repeated data
Leaves out data outside the range of hearing.
Simplifies wave forms.
Cuts out random bits.
