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Related to intermediate frequency: Image frequency
intermediate frequency[‚in·tər′mēd·ē·ət ′frē·kwən·sē]
The frequency produced by combining the received signal with that of the local oscillator in a superheterodyne receiver. Abbreviated i-f.
intermediate frequency (IF)
In superheterodyne receivers, a frequency resulting from the combination of the received modulated carrier frequency and the locally generated oscillator frequency. An intermediate frequency is so called because it lies between the modulated radio frequency and the audio frequency.