Which term describes the number of measurements taken from an analogue sound wave each second?
Sample rate
What is meant by the bit depth of a digitised sound?
The number of bits used to record each measurement of the sound wave
What is meant by the amplitude of an analogue sound wave?
The height of the wave at the point at which it is measured
Which term describes the length of time between one measurement of a sound wave and the next?
Sample interval
What is meant by a sample in digitised sound?
A measurement of the amplitude of a sound wave at a given time
Which unit is used to measure the number of measurements taken from a sound wave each second?
Hertz
Which component converts an analogue sound signal into digital data so that a computer can store it?
An analogue to digital convertor
Which statement describes the difference between analogue and digital sound signals?
Analogue signals are continuous and digital signals are discrete
Which term means the same as bit depth?
Sample resolution
A sound file is described as having a sample rate of 44,100 Hz. What does this value tell you?
44,100 samples are taken every second
Why must an analogue sound wave be sampled before a computer can store it?
A computer can only store discrete binary values
A computer plays a stored music file through speakers. Which component converts the digital data back into an analogue signal?
A digital to analogue convertor
A recording is made again with a higher sample rate but the same bit depth and duration. What is the result?
More samples are taken so the sound file becomes larger
A sound is recorded for 3 seconds at a sample rate of 1,000 Hz and a bit depth of 8 bits. What is the file size in bits?
24,000 bits
A sound wave is sampled every 0.002 seconds. What is the sample rate of the recording in hertz?
500 Hz
A recording is made using a very low bit depth. Why does this reduce the quality of the sound file?
Each wave height is rounded to one of a few values
A sound is stored using a 3-bit bit depth. How many different values can be used to record the amplitude of each sample?
8
Why does recording with a low sample rate reduce the quality of the digitised sound?
The wave is measured less often so rapid changes are missed
A sound is recorded for 4 seconds at a sample rate of 500 Hz. How many samples are stored in the recording?
2,000
Two recordings of the same sound use the same sample rate and last the same time. Recording A has a bit depth of 16 bits and recording B has a bit depth of 8 bits. Which statement is true?
A is a larger file and records each wave height more accurately
Why is a digitised recording never an exact copy of the original analogue sound?
The wave is measured at intervals and each value is rounded
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