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What is meant by pre-emphasis and de-emphasis?
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Answer Posted / shruti
Pre-emphasis is a strong high frequency boost before the transmitter, and an equally strong high frequency attenuation in every radio.
In telecommunication, de-emphasis is the complement of pre-emphasis, in the antinoise system called emphasis. Emphasis is a system process designed to decrease, (within a band of frequencies), the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation differences or saturation of recording media in subsequent parts of the system.
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