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1

The superheterodyne approach may be OK but the issue there may be with your requirement if "wide frequency range". The frequency deviation would be only shifted in frequency. If your target audible range would be (as an example) 1kHz .. 9kHz that defines your bandwidth as 8kHz (or FM frequency deviation +/- 4kHz). Though this is a good chunk of the ...


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There are two classes of frequency shift operation - linear/additive, and multiplicative. With linear shifting, you take a block of one frequency, and shift it linearly keeping the same bandwidth to another frequency, using a mixer. This is how 'bat detectors' work. It is trivial to do in real time with mixer hardware. The technique destroys harmonic ...


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