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sampling
measuring an analogue signal at regular intervals
sample rate
the number of samples per second
sample interval
this time between two samples
bit depth
the number of bits used to store each sample
file size formula
sample rate x bit depth x length (seconds)
stereo sound
uses two channels
amplitude
the intensity/height of a sound wave
frequency
the number of cycles per second
frequency formula
number of cycles / time (seconds)
how is sound captured
microphone picks up sound wave
signal is processed by an ADC
ADC takes samples
sample is recorded as a binary number
DAC is used to listen to audio
nyquist theorem
the sample rate must be twice the frequency
MIDI (Musical Instrument Digital Interface)
a set of digital instructions telling a device how to generate sound
Note 
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