su·per·het·er·o·dyne 
(s′pər-hĕtər-ə-dīn′)
(s′pər-hĕtər-ə-dīn′)adj.
Of, relating to, or being a form of radio reception in which the frequency of an incoming radio signal is mixed with a locally generated signal and converted to an intermediate frequency in order to facilitate amplification and the rejection of unwanted signals.
n.
A superheterodyne radio receiver.
[SUPER(SONIC) + HETERODYNE.]