overmodulation
/ˌəʊvəmɒdjʊˈleɪʃn/ /ˌəʊvəmɒdʒʊˈleɪʃn/Electronics and Telecommunications
noun
Distortion occurring during amplitude modulation as a result of an excessively large modulating signal; specifically distortion whereby the amplitude of the carrier becomes zero for a significant part of each cycle of the modulating wave.
Origin
1920s. From over- + modulation. Compare slightly later over-modulate.