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Publishers Clearing House. Publishers Clearing House (PCH) is a direct marketing company that markets merchandise and magazine subscriptions with sweepstakes, and prize-based games. Publishers Clearing House was founded in 1953 by Harold Mertz to replace door-to-door magazine subscription sales by a single vendor offering multiple subscriptions by mail.
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.