Discussion
Which pulse scheme is the natural precursor of pulse code modulation?
Answer: A
Amplitude modulation comes first, because coding begins by taking amplitude samples and then quantising them; the width and position schemes encode into other parameters and lead nowhere digital. Delta modulation is an alternative digital scheme rather than a precursor. Tracing which analogue scheme a digital one grew out of explains why sample-and-hold circuits sit at the front of every coder.
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