Hi.
I've got current signal (very long) from ac motor. It's look like AM modulation. I want to find his envelope, but some noise are trouble here (FFT is ok). How I can (digital) cut off this noise ? Maybe some filter ?
Hi mathuranathan,
Its true, I checked repeatedly the pic, it has a line at ca. 5Hz_is knowed the origin of that, is it a real signal pls?
If yes_of course, a bandpass is wished, but 50Hz is relative bulky_or need sinthetyc inductances/multiplyd capacitors or even gyrator circuit...
K.
I'm working in LabView so I can use any filter (any order) I want. The problem is when I use a bandpass filter (for example Chebyshev, 7th order, low cut off freg 30Hz, high cut off freq 70Hz) the signal has weird noise still.
It isnt normal AM modulation, so maybe I should find other way to cut noise. Maybe some digital image processing algorithm ? Median filter or something else ?