The gradual increase in amplitude of higher-frequency signals in frequency modulation practices for increasing signal-to-noise ratios.
The modulation in a radio system where the modulation level (deviation) rises with higher modulation frequencies. Also a circuit that produces such a rising level with frequency.
An artificial increase in the amplitude of the higher frequency portions of a baseband signal prior to frequency modulation and transmission via a radio link. Used in conjunction with the proper amount of de-emphasis at the receiver, this results in an improved signal-to-noise ratio for the demodulated FM signal. See also De-Emphasis.