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Low pass or high pass filter using impulse response.

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Bob
Bob 2013-10-20
回答： Image Analyst 2013-10-20
I have a .wav sound file that I want to filter with either a low pass or high pass filter using impulse response. my code is the following
[x,fs] = wavread('1.wav'); h = [-1 1]; %impulse response coefficients y = filter(h,1,x); %filter
I do not know which values of h I should pick to get low pass or high pass. I would like the filter to be as ideal as possible. Thanks.

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Image Analyst
Image Analyst 2013-10-20
All positive weights will blur the signal and be a low pass filter. Negative weights will be required to do a high pass filter. To get more control of what frequencies get filtered, you will have to do it in the spectral domain - use fft().

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