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thanks for the reply. yeah you are right. what i like to do is shift the everything in frequency domain and then do the inverse fourier transform to get the time domain for that spectra. Now initially the time domain do not have any phase information. but after ifft it is producing complex value...
hi
I need some help on fourier and inverse fourier transform. this is what i want to do.
i) i have a time signal 110 ms in length. the data is a 2048 by 1. now if i take the fourier transform in will gave me 2048 by 1 matrix. i want to reduce this size to get a time signal of 1 fourth of its...
actually i want to shift it a small bit. so mathmatically i can multiply the time signal by exp(2*f*t) but it will give you some imaginary value. but time signals are always real . is there a way to do it so that i can have only real value.
thanks
thanks rongo024 for your response .i mean i need to change the cut off frequency from f to f2 and then need to find the time domain response. but time domain response should be a impulse response. i do not mean same response. it should look like similar. how could i do that?
hi
I am new in signal processing. I have a impulse response of system A which has cut off frequency at f. now i need to shift it to f2 and still the response should be a impulse response. mathematically i can do it by multiplying it with exp(2*pi*f2-f*t) but that does not give you the impulse...
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