What type of filter is used in this code?

[caleigh]

R = 50;
d = rand(R,1)-0.5;
m = 0:1:R-1;
s = 2*m.*(0.9.^m);
x = s + d';

figure(1)
plot(m,d,'r-',m,s,'b--',m,x,'g:')
xlabel('Time index n'); ylabel('Amplitude')
legend('d[n]','s[n]','x[n]');
pause

M = input('Number of input samples = ');
b = ones(M,1)/M;
y = filter(b,1,x);

figure(2)
plot(m,s,'r-',m,y,'b--')
legend('s[n]','y[n]');
xlabel ('Time index n');ylabel('Amplitude')

this coding,ca anybody tell me what type of filter is being use in this coding

 

[bulx]

Re: filter coding

It is called a "comb" I think. It just produces average of last M samples. Can be used for interpolation.
-b

 

[caleigh]

Re: filter coding

It is called a "comb" I think. It just produces average of last M samples. Can be used for interpolation.
-b

thanx bulx...that is very helpful...bulx..can you help me on the coding, what is the purpose of each coding?i really new o the matlab and the filter coding...please