An audio signal consists of two components, amplitude and frequency.
When an analog audio signal is converted to a digial representation, these
two components are stored by a bit-depth value, and a sample-rate value.
The sample-rate represents the number of samples of audio per second, and the
bit-depth represents the number of bits used capture that audio. The bit-depth
specifies the dynamic range (the difference between the smallest and loudest
audio signal). By changing the bit-depth of an audio file, you can create
rather interesting digital distortion effects.