单词	superheterodyne
释义	superheterodyne adjective su·​per·​het·​ero·​dyne ˌsü-pər-ˈhe-tə-rə-ˌdīn  -ˈhe-trə- : used in or being a radio receiver in which an incoming signal is mixed with a locally generated frequency to produce an ultrasonic signal that is then rectified, amplified, and rectified again to reproduce the sound superheterodyne noun Word History Etymology supersonic + heterodyne First Known Use 1920, in the meaning defined above
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