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.
Internal Documentation (in-text citations, parenthetical references) APA Publication Manual, sections 6.01-6.21 APA style uses the author-date system for citing references in the text of your paper. cited in the text will appear alphabetically in your reference list. styles appears on page 177 in the APA Publication Manual. number (or paragraph number for non-paginated sources).