Discussion
A technique used by codecs to convert an analog signal into a digital bit stream is known as
Answer: A
Correct answer: Pulse code modulation
PCM converts an analogue waveform to digital in three steps: the signal is sampled at a fixed rate, each sample is quantised to the nearest of a set of levels, and the level is written as a binary number. Sampling above twice the highest frequency present - the Nyquist rate - allows the original to be reconstructed; telephone speech is sampled at 8 kHz with 8 bits, giving 64 kbps.
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