Designing a lowpass filter with lesser filter coefficients with the required parameters
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi,
I am currently using a lowpass fitler as below
d = fdesign.lowpass('Fp,Fst,Ap,Ast',3,8,1,20,500);
Hd1 = design(d);
length=length(Hd1.Numerator);
data1 = filtfilt(Hd1.Numerator,1,data1);
The response of the filter when the input of square pulse is shown below
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/155390/image.jpeg)
But the filter coefficients are of a length of 104 but I want to use lesser filter coefficients(say <20 or some other lesser coefficients) such that the filter perforamnce should be good enough. can someone explain if there is a way of doing it. Thanks.
0 Kommentare
Antworten (1)
AJ von Alt
am 21 Jan. 2014
Bearbeitet: AJ von Alt
am 21 Jan. 2014
If you do not specify the order of a filter, the design tool will try to minimize the order while satisfying the specified constraints. If you have a specific filter order in mind, I recommend consulting the fdesign.lowpass documentation and selecting a specification that includes N, the filter order.
Here is a simple design adapted from the example article to help you get started.
Fc = 0.4;
N = 20; % FIR filter order
Hf = fdesign.lowpass('N,Fc',N,Fc);
Hd1 = design(Hf,'window','window',@hamming,'SystemObject',true);
hfvt = fvtool(Hd1,'Color','White');
1 Kommentar
nam bui
am 12 Feb. 2021
Hello sir,
I tried to implement the piece of code you provided above but it said I need a DSP system toolbox license but I still have the signal processing toolbox under my matlab license. I'm wondering is there like an alternative way to do it?
Thank you
Siehe auch
Kategorien
Mehr zu Filter Analysis finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!