Since all that a pcm accomplishes is analog to digital conversion, why is it called a modulation technique?
There is a message signal but no carrier. According to my knowledge, modulation requires a carrier.
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Since all that a pcm accomplishes is analog to digital conversion, why is it called a modulation technique?
There is a message signal but no carrier. According to my knowledge, modulation requires a carrier.
Best Answer
From Wikipedia's article on modulation:
So all we need to do is identify a periodic waveform and a way to modify its properties by a signal. One easy way to think of this: the "carrier wave" is a dirac comb that pulses at the pulse repetition rate. This signal is modified by convolving it with a pulse whose width varies as a function of the input. This creates a pulse train.