单词	automatic frequency control
释义	automatic frequency control noun : a function of an electronic circuit that allows a radio transmitter or receiver to stay adjusted to a specific frequency (such as one used by a radio station) without manual control A five-inch dynamic speaker, backed by 700 megawatts of audio output power puts out a quality sound and automatic frequency control prevents FM signals from drifting. Dale Baldwin, Los Angeles Times, 27 Jan. 1985 Word History First Known Use 1921, in the meaning defined above
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