One of the key aspects of psychoacoustic is the study of timbre and how humans perceive them.

Analog audio is named so because the pattern of an electrical or magnetic pressure audio signal is analogous to, or looks like, the original pattern of changing air pressure that we perceive. Most common mediums of analog audio are vinyl discs and magnetic tapes.

In electronics, a digital-to-analog converter (DAC, D/A, D2A, or D-to-A) is a system that converts a digital signal into an analog signal.