2.5 Sound
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Sound waves are analogue state what analogue means in this context.
Continuously changing
How do we store sound on a computer?
You need to convert the waveform into a numerical representation
What does ADC stand for?
Analogue-to-digital
What does an ADC do?
takes real-world analogue signals and converts them to a digital representation
Name the steps in order when the analogue signal is converted for sound waves:
Analogue sound is received by a microphone This is converted into an electrical analogue signal The signal amplitude(height of the wave)is measured at regular intervals The values are rounded to a level The values are stored as a series of binary numbers
What is a sample?
A measure of amplitude at a point in time
The accuracy with which an analogue sound wave is converted to a digital format depends on what two things?
sample resolution sample rate
What is sample resolution?
The sample resolution is the number if bits used to store each sample
What is the sample rate?
The sample rate is the frequency with which you record the amplitude of the sound
What is the sample rate and what it is measured in?
The number of samples taken in a second measured in hertz
what does 1 hertz represent in sample rate?
1 hertz = 1 sample per second
The more frequently the sound is sampled the better the ………..
The more frequently the sound is sampled the better the quality of the playback
The more bits that are used the what?
The more bits that are used the better the accuracy of the recording
What is sample size?
The number of seconds over which the sample was taken