Discussion
A technique used by codecs to convert an analogue signal into a digital bit stream is known as
Answer: A
Correct answer: Pulse code modulation
PCM converts an analogue signal to digital in three steps: sampling it at regular intervals, quantising each sample to the nearest of a set of levels, and encoding that level as a binary number. It is how speech becomes bits in digital telephony, and how sound is stored on a CD - 44,100 samples a second at 16 bits.
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