Confusion implementing chebyshev type 2 band pass filter in matlab

I want to implement chebyshev type 2 band pass filter in matlab;actually i am not getting band pass oytput,output looks like low pass

My code is below

% Design a band pass Chebyshev Type II filter using analog prototyping. The
% order of filter is 20 with a value of 60 dB stop band attenuation and 0.75 dB pass band 
% ripple where,
% Pass band edge = 800 Hz
% Stop band edge = 2000 Hz
% Sampling frequency = 6000

clc;  close all;   clear all;
Rp = 0.75;    Rs = 60;
fp = 800;
fs = 2000;
Fs = 6000;

fn = Fs/2;     % nyquist frequency
wp = fp/fn;     % Pass band corner frequency
ws = fs/fn;     % Stop band corner frequency

[n,Wn] = cheb2ord(wp,ws,Rp,Rs);
[num,den] = cheby2(20,Rs,Wn);
freqz(num,den,512,Fs);

I have also attached snapshot of output which shows that output frequency plot looks like low pass,

[Haseeb Ahmed]

Just use cheby2 commands by putting cut off frequiencies in square box, and your issue will be solved.

Answer 1

[Haseeb Ahmed]

[b,a] = cheby2 (10,Rs, [wp ws],'bandpass');

Use the above mentioned command, it will provide a band pass responce. Square brakets must have two cut off frequencies.

code:

clc; clear all; close all;

fp = 800; %pass band edge

fs = 2000; %stop band edge

Rp = 0.75; % pass band ripple

Rs = 60; % stop band attenuation

fsampling = 6000; % sampling frequency

wp=2*fp/fsampling ; % convert to radians per second

ws=2*fs/fsampling ; % convert to radians per second

n = 10 ; % order always 2n for band pass

[b,a] = cheby2 (10,Rs, [wp ws],'bandpass');%designs a lowpass, highpass, bandpass,

% or bandstop Chebyshev Type II filter, depending on the value of ftype

% and the number of elements of Ws. The resulting bandpass and bandstop designs

% are of order 2n.

freqz(b,a) %frequency response of digital filter