Hi everybody,
I have two signals Signal which contains 75kHz and 5kHz and a Reference signal which contains 75 kHz.
I want to see the FFT of the multiplikation of both signals. But I have problems with the FFT and the x-axis I guess. Does anybody see the error?
(*Functions*)
Signal[t_, w_] :=
Sum[2*Sin[2 \[Pi]*w*t] +
RandomReal[{-.2, .3}], {w, {75000,
5000}}]; (*Sum of two frequencies 75kHz Cantilever and 5kHz Bias*)


ReferenceSignal[t_] :=
2*Sin[2 \[Pi]*75000*t + 90] + RandomReal[{-.1, .1}];
ModulationsSignal[t_] := Signal[t, w]*ReferenceSignal[t];