Question
How to pass a audio signal through a filter ? It should work based on spectral energy i.e if its between 0-4 kHz it falls on speech band and If it falls between 4 kHz-8 kHz then it comes under noise band.Now the VOS(voice operated switch) should be activated if the signal is in speech band and it should be deactivated when it is in noise band. Can some one help me on this problem.
Expert Answer
Kshitij Singh
PhD Expert
Answered Aug 13, 2026
The first step is to design a filter to obtain the A and B vector coefficients.Then use the Butter function, for instance to obtain your signal(type Butter in your Matlab command window and you will find many other type of filters). Once you have obtained the B and A vector coefficients you can filter your signal using the function filter.
y=filter(x,A,B) x(is your input signal) and y your filtered signal.
Once you have filtered the signal you can calculate the spectral energy before and after filtering to find out if the filter has removed a significant part of your signal.
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