> I call it simply spectrum too, maybe I should have said
> magnitude/phase spectrum.
Now I'm confused. Magnitude spectrum is definitely my $|\text{DFT}|$;
but you're just looking for a plot of the DFT, right?
> Indeed i don't need imaginary part in this case because the spectrum
> is real
That im
Hm, I'd call that /spectrum/, simply :) In any case, I don't fully
understand, then, how you'd circumvent the need for a real and imaginary
part. Your $X_k$ is complex!
Cheers,
Marcus
On 04/26/2017 03:46 PM, Fernando wrote:
> Hi!.
>
> I think the amplitude spectrum is the DFT:
> {\displaystyle {\b
Hi!.
I think the amplitude spectrum is the DFT:
{\displaystyle {\begin{aligned}X_{k}&=\sum _{n=0}^{N-1}x_{n}\cdot
e^{-i2\pi kn/N}\\&=\sum _{n=0}^{N-1}x_{n}\cdot [\cos(2\pi kn/N)-i\cdot
\sin(2\pi kn/N)],\end{aligned}}}
So, it has sign. The power spectrum is the absolute value so it has no sign.
Hey Fernando,
not quite sure I get what you need; I'd say the Amplitude Spectrum you'd
be looking for is
$$A_{|\cdot|}[f]=|X[f]| = \left\lvert\sum_{n=0}^{N-1} x[n]\cdot e^{j2\pi
\frac {nf}N}\right\rvert $$
or, rather, the decibel representation of that. There's no way to get a
negative number ou
Hello.
Yes, with Time sink I can see the difference, but if the signal is
compound of some other signals (for instance signal=1K/amplitude +1
+2K/amplitude -1 +3K/qamplitude +1 +4K/amplitude +1 ) i would like to
see the 2k signal as -1 amplitude, but in the power spectrum it will
appear as possi
Hi.
Is there a way of visualizing ampitude spectrum (with + and - signals)
instead of power spectrum?
regards
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