How to convert from time domain to frequency domain?

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MatlabGirl
MatlabGirl 2014-12-7
评论： MatlabGirl 2014-12-7
I have this filter:
filter_2 = firceqrip(2,0.6,[0.05 0.03]);
I want to convert it to the frequency domain to multiply it by a signal (i.e filter in the frequency domain)

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Image Analyst
Image Analyst 2014-12-7
Call fft() or pwelch().
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Image Analyst
Image Analyst 2014-12-7
But you're not filtering an impulse with filter_2 are you? You're filtering a signal with a filter, filter_2.

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