Units of Measure
Digital representations of analog audio, often referred to as “PCM Data” (Pulse Code Modulation) represent a series of value “snapshots” or “samples” of the analog signal’s instantaneous amplitude (equivalent to voltage) over time. These samples are recorded at a rate of speed referred to as the “Sample Rate". For example, 8000 samples/sec is typically the minimum for voice material, and 44,100 samples/sec is typically the minimum for music.
Each sample thus represents a signal’s instantaneous amplitude at a point in time, in units equivalent to voltage.