PCM redirects here. For other uses, see PCM (disambiguation). Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps.
1 As well as MLA, APA papers are also double-spaced with 1-inch margins on each side. 2  APA guidelines recommend you to use readable and clear font, such as Times New Roman, 12 pt.  The main distinction of APA style is a ârunning headâ at the top of each page.
A Brief Guide to using Word 2007 to Formatting Papers in the Publication Style of the American. Psychological Association. 1. Setting up your margins â The 2007 default is 1 inch for top, bottom, left and right, which is. consistent with APA format. In 2003 files, the default is 1.25 for left and right and had to be.