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.
Check out this gallery of examples, tips, and guidelines for writing papers in APA format. Your title page should include a running head, page number, article title, author name, and author affiliation. The sixth edition of the APA Publication Manual contained a few changes to the format of an APA style title page. Your title page should contain a running head that is flush left at the top of the page and a page number that is flush right at the top of the page.