Discussion
The frequency that produces the same intermediate frequency as the wanted signal, and cannot be removed after mixing, is the ______ frequency.
Answer: C
This is the image frequency, sitting twice the intermediate frequency from the wanted signal and one intermediate frequency on the far side of the oscillator. The intermediate frequency is the output of the conversion rather than an input to it. The oscillator is what performs the conversion. And an adjacent channel remains distinguishable after mixing, which is why the intermediate frequency filter can deal with it. The image is singled out precisely because it is the one unwanted response the architecture cannot fix downstream.
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