Please enable JavaScript.
Coggle requires JavaScript to display documents.
Representing sound - Coggle Diagram
Representing sound
analogue and digital
humans can hear in analogue
computers work in digital
Computers must convert sound into digital data
A microphone measures changes in air pressure and translates it into electrical voltage
ADC digitises voltage into bytes and displays the digitised sound for manipulation
sample rate
It is measured in hertz (Hz)
More samples = more accurate reproduction = better quality = larger file sizes
bit rate
•The higher the rate the more realistic the sound
Usually measured in Kilobits per second (Kbps)
The bit rate tells us how many bits of data are processed every second
Sample rate is how many samples or measurements of the sound are taken each second
bit depth
number of bits available per sample
audio files are encoded or saved as a particular type
higher bit depth higher quality
digital sound
audio captured via a microphone
converted into binary
ADC converter is a device used to transfer analogue into digital
quality determined by sample rate, bit depth and bit rate
sound is a data type
• Software saves the data as sound files