over-modulate
/ˌəʊvəˈmɒdjʊleɪt/ /ˌəʊvəˈmɒdʒʊleɪt/Electronics and Telecommunications
verb
[with object] To subject (a signal, device, etc.) to overmodulation. Also without object: to cause or suffer overmodulation.
Origin
1920s; earliest use found in Lionel Stanley Palmer (b. 1891). From over- + modulate.