History
Audio signals are sound waves—longitudinal waves which travel through air, consisting of compressions and rarefactions. These audio signals are measured in bels or in decibels. Audio processing was necessary for early radio broadcasting, as there were many problems with studio to transmitter links.
Read more about this topic: Audio Signal Processing
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“All history becomes subjective; in other words there is properly no history, only biography.”
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“History is the present. That’s why every generation writes it anew. But what most people think of as history is its end product, myth.”
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—Henry David Thoreau (1817–1862)