Hi,If I understand correctly, you would like to create the filter in Scilab, and directly access from Xcos?
if so, u could use the syslin object to do so.
1. Create the syslin obj
h1 = wfir("lp",2,[.2 0],"re",[0 0])
h2 = wfir("hp",3,[.1 0],"re",[0 0])
num1 = poly(h1,'z','coeff')
d = ones(1,size(h1,2)+1)
d(1:$-1) = 0
den1 = poly(d,'z','coeff')
H1 = syslin('d',num1,den1)
num2 = poly(h2,'z','coeff')
d = ones(1,size(h2,2)+1)
d(1:$-1) = 0
den2 = poly(d,'z','coeff')
H2 = syslin('d',num2,den2)
2. In Xcos
use H1.num in the numerator block for LPF, H1.den in the denominator for
the LPF, same for the HPF.
Hope this helps. rgds, CL On 1/4/2017 9:53 PM, Nikolay Strelkov wrote:
Anybody? Dear Tim, do you have any idea? -- /With best regards,Ph.D., //associate professor at MPEI <http://mpei.ru/lang/en/Pages/default.aspx>,IEEE member,maintainer of Mathieu functions toolbox for Scilab <http://atoms.scilab.org/toolboxes/Mathieu/>,Nikolay Strelkov./2017-03-23 14:27 GMT+03:00 Nikolay Strelkov <[email protected] <mailto:[email protected]>>:Dear all! I'm playing with simple digital filtering in Xcos 5.5.2. I have two filters - low-pass and high-pass, connected in series. Xcos does not have convolution block. So I write FIR transfer function <https://ccrma.stanford.edu/%7Ejos/fp/FIR_Transfer_Function.html> manually from impulse response function. I get impulse response functions from wfir function. Let's assume that we have two simple filters with impulse responses: h1 = [0.3741957 0.3741957]; // it's low-pass filter from h1 = wfir("lp",2,[.2 0],"re",[0 0]) and h2 = [- 0.1870979 0.8 - 0.1870979]; // it's high-pass filter h2 = wfir("hp",3,[.1 0],"re",[0 0]) I convert them to DLR <https://help.scilab.org/docs/5.5.2/en_US/DLR.html> SISOs and get: H1(z) = 0.3741957*z^-1 + 0.3741957*z^-2 = ( 0.3741957*z + 0.3741957 ) / (z^2); H2(z) = -0.1870979*z^-1 + 0.8*z^-2 - 0.1870979*z^-3 = ( -0.1870979*z^2 + 0.8*z - 0.1870979*z ) / (z^3); and place their numerator and denominator to the corresponding DLR blocks. Model is in attachment. It's an illustration, not real world example. I have a question. How I can automate the aforementioned process programmatically? I tried to create numerator and denominator with poly function and as strings, but Xcos does not support these types in DLR settings. -- /With best regards, Ph.D., assistant professor at MPEI <http://mpei.ru/lang/en/Pages/default.aspx>, IEEE member, maintainer of Mathieu functions toolbox for Scilab <http://atoms.scilab.org/toolboxes/Mathieu/>, Nikolay Strelkov./ _______________________________________________ users mailing list [email protected] http://lists.scilab.org/mailman/listinfo/users
_______________________________________________ users mailing list [email protected] http://lists.scilab.org/mailman/listinfo/users
