PCM: Pulse code modulation. It is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers, digital telephony and compact discs. The amplitude of this signal is sampled regularly at uniform intervals.
PAM: Pulse amplitude modulation. It is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses.
True.
Scientifically proven, there is no way for any animal or creature to live in space, because there is no oxygen, nor vacuum to keep people and animal alive there. That is why astronauts have to wear suits when they are in outerspace.
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