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I don't know if this is the right place to place this, but here it goes:

I tried an IDFT approach in LTspice, which doesn't know sqrt(-1). If z=a+i*b then, in LTspice, z=a, |z|=a, so b is lost. With this in mind, the IDFT is done with sin^2+cos^2 which gives me |sinc(x)|, but I need the sinc to be "regular" sinc, oscillating. So, the question is: is it possible through whatever trick/cheat/etc to restore or get an oscillating sinc(x) after the transform? Anything.

I am using this chain of .funcs:

real(n,t)=sin(2*pi*n*(t-M/2)/(M+1))*f(n)

imag(n,t)=cos(...)

re(t)=real(0,t)+real(1,t)+...

im(t)= ...

h(t)=hypot(re(t),im(t))/(M+1)

Anticipated thanks,

Vlad

PS: No homework,their time is long past. This is to try and implement a simple IDFT in LTspice.

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# Restore sgn(f(x)), f(x)=abs(sinc(x)) ?

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