This document discusses how analog voice signals are measured, the units used, and the points of reference used when you measure. The quality of a transmission system is defined by the difference between spoken voice at one end and reproduced voice at the other end.
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Lee DeForest-AM Radio. The result of Lee DeForest's work was the invention of amplitude-modulated or AM radio that allowed for a multitude of radio stations. The earlier spark-gap transmitters did not allow for this.