
Overmodulation is the condition that prevails in telecommunication when the instantaneous level of the modulating signal exceeds the value necessary to produce 100% modulation of the carrier. In the sense of this definition, it is almost always considered a fault condition. In layman`s terms, the signal is going `off the scale`. Overmodulation ......
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http://en.wikipedia.org/wiki/Overmodulation

the condition in which some peak values of the modulating signal exceed the maximum value permitted by the system or the equipment considered NOTE - In full carrier amplitude modulation, the maximum value is that corresponding to a 100 % modulation factor.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-06-20

excessive amplitude modulation, resulting in distortion of a signal.
Found on
https://www.infoplease.com/dictionary/overmodulation
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