phase advancing of a signal by 90 degrees

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priya
priya 2020-1-27
评论： priya 2020-1-27
I want to sense a signal, and advance the phase of the signal by -90 degrees, keeping the magnitude of the signal same (in MATLAB Simulink). Please help.
I am attaching a simulation, where i tried to extract the magnitude and phase of the signal and added -90 °, and re-convert it. But it is not working.

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回答（1 个）

Walter Roberson
Walter Roberson 2020-1-27
Multiply the signal by -1i .
You can either do that by a multiplication, or by taking
complex(imag(TheSignal), -real(TheSignal))
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Walter Roberson
Walter Roberson 2020-1-27
That is not changing the phase of the signal by 90 degrees: that is putting in a delay of either 1/4 or 3/4 of the period.
Clock times frequency times 2 π, minus phase, sine thereof.
priya
priya 2020-1-27
Thanks for your efforts, Actually i want to sense a signal (that will be of sinusoidal nature) and phase shift it by -90 degress. but that is still not done.

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