help!!filter function help

[horizon12]

is the filter function in MATLAB is used in time domain domain or frequency domain??

for example so if you want to design a butter high pass filter and you get E signal in time domain

[b,a] = butter(n,frequncy,'high') ;

and then use the filter(b,a,E)
to apply the filter in time domain



is that correct ???


or I'm missing something here

 

[horizon12]

any help with that

thanks

 

[malik_zohaib]

you can also design filter by using 'sptool'
just write sptool in command window and play with it!!!