FIR_Filter Kaiser

I need to decrease the filter order n by 1

fsamp = 12000; %sampling rate 
fcuts = [1800 2000]; %indicate frequency cutoffs 
mags = [1 0]; %desired magnitudes per band 
devs = [0.0114469 0.01778279]; %amplitude deviation per band 
[n,Wn,beta,ftype] = kaiserord(fcuts,mags,devs,fsamp);... 
    %Use Kaiser window estimation 
hh = fir1(n,Wn,ftype,kaiser(n+1,beta),'noscale'); %design FIR filter 
freqz(hh) %plot response

Answer 1

[Star Strider]

I am not certain what the problem is.

Try something like this —

fsamp = 12000; %sampling rate 
fcuts = [1800 2000]; %indicate frequency cutoffs 
mags = [1 0]; %desired magnitudes per band 
devs = [0.0114469 0.01778279]; %amplitude deviation per band 
[n,Wn,beta,ftype] = kaiserord(fcuts,mags,devs,fsamp);
n = n-1;                                                                % <— ADDED
    %Use Kaiser window estimation 
hh = fir1(n,Wn,ftype,kaiser(n+1,beta),'noscale'); %design FIR filter 

figure
freqz(hh,1,2^16,fsamp) %plot response

Changing the filter order by 1 likely changes nothing significant about the filter behaviour, at least for FIR filters.

.