Answer Posted / mohamed hussein

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.
Special time constants dictate the frequency response
curve, from which one can calculate the cutoff frequency

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