Filter design

hi
 
on the fdatool i designed a fir hamming filter and generated the m
file and got this
 
Fs = 48000; % Sampling Frequency
 
N = 5000; % Order
Fc1 = 1000; % First Cutoff Frequency
Fc2 = 15000; % Second Cutoff Frequency
flag = 'noscale'; % Sampling Flag
% Create the window vector for the design algorithm.
win = hamming(N+1);
 
% Calculate the coefficients using the FIR1 function.
b = fir1(N, [Fc1 Fc2]/(Fs/2), 'bandpass', win, flag);
Hd = dfilt.dffir(b);
 
i have sinwave signal using x=sin(2*pi*f*t1); but how do i pass the
signal though this filter
 
i tried this x2 = x.*b; and just got a cross and i dont know what Hd
is used for
 
does anyone have any ideas on how to pass the signal though the
filter
 
thanks
 
james bond

"james_bond" <james_bond_890@HOTMAIL.COM> wrote in message
news:k_KdnfDZOLkH_S_YnZ2dnUVZ_riknZ2d@giganews.com...
>
> hi
>
> on the fdatool i designed a fir hamming filter and generated the m
> file and got this
>
> Fs = 48000; % Sampling Frequency
>
> N = 5000; % Order
> Fc1 = 1000; % First Cutoff Frequency
> Fc2 = 15000; % Second Cutoff Frequency
> flag = 'noscale'; % Sampling Flag
> % Create the window vector for the design algorithm.
> win = hamming(N+1);
>
> % Calculate the coefficients using the FIR1 function.
> b = fir1(N, [Fc1 Fc2]/(Fs/2), 'bandpass', win, flag);
> Hd = dfilt.dffir(b);
>
> i have sinwave signal using x=sin(2*pi*f*t1); but how do i pass the
> signal though this filter
>
> i tried this x2 = x.*b; and just got a cross and i dont know what Hd
> is used for
>
> does anyone have any ideas on how to pass the signal though the
> filter
>
> thanks
>
> james bond

You need the FILTER command which does convolution (or something similar).

F.



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