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Worksheets9.1 Homework #3
Total questions: 20
Worksheet time: 16mins
How is sound stored on a computer?
What is the process called for converting analogue sound into binary (digital format)?
What is the term for how many samples are taken per second?
Sample Rate
Sample Resolution
Binary
File Size
What is sampling?
The number of bits used to represent a digital sound.
Turning a microphone on and off to only record sound at certain times.
Taking measurements of an analogue sound wave at regular intervals.
Combining two digital sound waves into one.
What unit is sample rate measured in?
Bits per second (bps)
Hertz (Hz)
Megabits per second (Mbps)
Which of the following is not true if you increase the sample rate?
Better quality of recording
Needs greater storage space
Larger file size
Decrease in quality
What is meant by bit depth?
The number of samples taken per second
The amplitude of each sample
The number of bits used per second of audio
The number of bits used to store each sound sample
Which of the following is true if you decrease the sample size?
File size increases
Sound quality increases
Sound quality decreases
Number of sound samples taken per second increases
What sample rate is used for CD quality sound?
44,100 Hz
88,200 Hz
22,100 Hz
What piece of hardware would you use to input sound into a computer?
Digital to analogue converter
Microphone
Analogue to digital converter
Speaker
If you increase the bit depth of an audio file then you increase the quality?
True
False
Match the following
Sample rate
How many bits are recorded at sample
Sound representation size (file size)
How many samples are taken in a second
Sample size
Sampe rate * Sample size * audio length
Pixels
Resolution
Colour depth
Binary
File size
Digital
Sample rate
Sample size
Duration
Hertz
To calculate a sound file size we use:
(Sample rate Sample size) * duration of clip
What would be the file size in bits if:
An audio clip is ten seconds long and has a sample rate of 5,000 (relatively low quality), each of the samples is medium quality of 10bits per sample.
5,000 * 5 * 10 = 250,000 bytes
5,000 * 10 * 10 = 500,000 bits
5,000 * 10 * 10 = 500,000 bytes
To calculate a sound file size we use:
(Sample rate Sample size) * duration of clip
What would be the file size in bytes (you will need to know how many bits in a byte) if:
The audio clip is only ten seconds long, yet it has medium sample rate of 20,000 hertz the sample size is 8 bits per sample.
What would be the file size in bytes
(a)
