MATLAB: Digital filters

digital filter line code errorduplicate post

H = dfilt.parallel(hd(1), hd(2), hd(3), hd(4), hd(5), hd(6), hd(7), hd(8), hd(9), hd(10), hd(11), hd(12), hd(13), hd(14), hd(15), hd(16), hd(17), hd(18), hd(19), hd(20) …, hd(100)));

Can anyone debug this line??

Best Answer

Where do you actually have the ellipsis, is it at a line break?

d = fdesign.lowpass;
Hd = design(d,'allfir');
H = dfilt.parallel(Hd(1),Hd(2),...
Hd(3));

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MATLAB: Fir and iir filtering

You have to know your filter specifications. If you do, you can do both with fdesign.lowpass and fdesign.highpass

fdesign.lowpass and fdesign.highpass have different specification strings which support different filter designs.

The default string 'Fp,Fst,Ap,Ast' supports both FIR and IIR designs.

Here is an example:

Design a lowpass filter with a passband frequency of 1 kHz, a stopband frequency of 1.5 kHz, passband ripple of 0.5 dB, and stopband attenuation of 40 dB. The sampling frequency is 20 kHz

   d = fdesign.lowpass('Fp,Fst,Ap,Ast',1e3,1.5e3,0.5,40,20e3);
   designmethods(d)  %shows which designs are valid for this spec
   Hdeq = design(d,'equiripple'); % FIR filter
   Hbutt = design(d,'butter'); %IIR design

MATLAB: Sound from a plucked string

There are two possibilities. I suspect the easier one will not work, but it is easier:

1) Change the line

dfilt.parallel(hd(1),hd(2),hd(3),hd(4),hd(5),hd(6),hd(7),hd(8),hd(
9),hd(10),hd(11),hd(12),hd(13),hd(14),hd(15),hd(16),hd(17),hd(18),
hd(19),hd(20)...,hd(100)));

dfilt.parallel(hd(1),hd(2),hd(3),hd(4),hd(5),hd(6),hd(7),hd(8),hd(
9),hd(10),hd(11),hd(12),hd(13),hd(14),hd(15),hd(16),hd(17),hd(18),
hd(19),hd(20),...
hd(100)));

But I suspect that will not work in practice.

Change the line

hd(n) = cascade(Ge(n),a(n)); % series connection of Ge^d and a

hd{n} = cascade(Ge(n),a(n)); % series connection of Ge^d and a

and change the line

dfilt.parallel(hd(1),hd(2),hd(3),hd(4),hd(5),hd(6),hd(7),hd(8),hd(
9),hd(10),hd(11),hd(12),hd(13),hd(14),hd(15),hd(16),hd(17),hd(18),
hd(19),hd(20)...,hd(100)));

dfilt.parallel(hd{:});

I believe this is the solution you need.

Best Answer

Related Solutions

MATLAB: Fir and iir filtering

MATLAB: Sound from a plucked string

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