DuckCorp Dico

Found one definition

1.                 From English-日本語 (にほんご) FreeDict+WikDict dictionary ver. 2022.11.18:
                   
   
   
                   
                     
   phase modulation /fˈeɪz mˌɒdjʊlˈeɪʃən/ <n>
   位相変調
   form of modulation