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.
The following are just a FEW of the most important rules. For more information, check out the manual (make sure you get the 6th edition) and/or go to the APA website. Format: All papers should be double-spaced throughout, (including the reference section) with one inch margins all around. Do not add extra lines between paragraphs or sections. The font should be 12 pt and you need to use a serif type style (with the hooks and curly-cues), such as Times or Courier. All paragraphs should be indented half an inch, NOT five spaces. Only one space should be added between the period at the end of a sentence and the first letter of the next.