Pre-emphasis network

In telecommunication, a pre-emphasis network is a network inserted in a system in order to increase the magnitude of one range of frequencies with respect to another.

Pre-emphasis is usually employed in frequency modulation or phase modulation transmitters to equalize the modulating signal drive power in terms of deviation ratio. The receiver demodulation process includes a reciprocal network, called a de-emphasis network, to restore the original signal power distribution.

References

 This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).