Many emerging technologies, including that used in ever-improving cell phones, begin with the capture and analysis of speech. speech is a continuum of variances in acoustic pressure produced by the talker. in wireless technology, electronics inside a mobile telephone converts the waves produced by the talker to impulses on the transmitting side and on the receiving side it converts these impulses back to their original wave form.

a) sound, analog

b) sound, digital

c) electromagnetic, analog

d) electromagnetic, digital

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