PCM – Pulse Code Modulation
PCM or **Pulse Code Modulation** is a method to digitally represent sampled analog signals. This is the standard system for digital audio in computers and various DVD, Blu-ray formats and in digital telephone systems. Each sample is quantized to the nearest value within a range of digital steps.
The two properties of PCM are the sample rate and the bit depth, this determines the number of digital values in the range.
![pcm Pulse Code Modulation](https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcRWaEpz6g1FcoEQsW5Uf9lylAwMIJRPf9T_LmzaqNpzkd521ioLGw)
See article on [Bit depth](http://www.blogger.com/blogger.g?blogID=5305969261108612456#editor/target=post;postID=4299953647823261605) and [Sample Rate](http://soundrolling.com/define/audio-sample-rate/) for more info.
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