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<div class="moz-cite-prefix">Hi,<br>
<br>
If I understand correctly, you would like to create the filter in
Scilab, and directly access from Xcos?<br>
if so, u could use the syslin object to do so.<br>
<br>
1. Create the syslin obj<br>
h1 = wfir("lp",2,[.2 0],"re",[0 0])<br>
h2 = wfir("hp",3,[.1 0],"re",[0 0])<br>
num1 = poly(h1,'z','coeff')<br>
d = ones(1,size(h1,2)+1)<br>
d(1:$-1) = 0<br>
den1 = poly(d,'z','coeff')<br>
H1 = syslin('d',num1,den1)<br>
num2 = poly(h2,'z','coeff')<br>
d = ones(1,size(h2,2)+1)<br>
d(1:$-1) = 0<br>
den2 = poly(d,'z','coeff')<br>
H2 = syslin('d',num2,den2)<br>
<br>
2. In Xcos<br>
use H1.num in the numerator block for LPF, H1.den in the
denominator for the LPF, same for the HPF.<br>
<br>
Hope this helps.<br>
<br>
rgds,<br>
CL<br>
<br>
On 1/4/2017 9:53 PM, Nikolay Strelkov wrote:<br>
</div>
<blockquote
cite="mid:CADK7Jfmi2O++m50XVMtk4PATe9yWe2odqMvDMqQkOwWaw5YYAA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Anybody?<br>
</div>
Dear Tim, do you have any idea?<br>
<div class="gmail_extra">
<div>
<div class="m_2710602294559543633gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">
<div class="m_2710602294559543633gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr"><br>
--<br>
</div>
<div><i>With best regards,<br>
<span lang="en"><span>Ph.D., </span></span></i><i><span
lang="en"><span>associate</span>
professor at <a
moz-do-not-send="true"
href="http://mpei.ru/lang/en/Pages/default.aspx"
target="_blank">MPEI</a>,<br>
</span><span>IEEE member,</span><br>
maintainer of <a
moz-do-not-send="true"
href="http://atoms.scilab.org/toolboxes/Mathieu/"
target="_blank">Mathieu functions
toolbox for Scilab</a>,<br>
<span>Nikolay</span> Strelkov.</i><br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">2017-03-23 14:27 GMT+03:00 Nikolay
Strelkov <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:n.strelkov@gmail.com" target="_blank">n.strelkov@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Dear all!<br>
<div><br>
</div>
<div>I'm playing with simple digital filtering in Xcos
5.5.2.<br>
I have two filters - low-pass and high-pass, connected
in series.<br>
</div>
<div><br>
Xcos does not have convolution block.<br>
So I write <a moz-do-not-send="true"
href="https://ccrma.stanford.edu/%7Ejos/fp/FIR_Transfer_Function.html"
target="_blank">FIR transfer function</a> manually
from impulse response function.<br>
</div>
<div>I get impulse response functions from <span
style="font-family:monospace,monospace">wfir</span>
function.<br>
</div>
<div><br>
</div>
<div>Let's assume that we have two simple filters with
impulse responses:<br>
</div>
<div><span style="font-family:monospace,monospace">h1 =
[0.3741957 0.3741957]; // it's low-pass filter
from h1 = wfir("lp",2,[.2 0],"re",[0 0])<br>
</span></div>
<div>and<br>
</div>
<div><span style="font-family:monospace,monospace">h2 =
[- 0.1870979 0.8 - 0.1870979]; // it's high-pass
filter h2 = wfir("hp",3,[.1 0],"re",[0 0])</span><br
clear="all">
</div>
<div>
<div>
<div
class="m_2710602294559543633m_3639511918185835174gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr"><br>
</div>
<div>I convert them to <a
moz-do-not-send="true"
href="https://help.scilab.org/docs/5.5.2/en_US/DLR.html"
target="_blank">DLR</a> SISOs and
get:<br>
</div>
<div><span
style="font-family:monospace,monospace">H1(z)
= 0.3741957*z^-1 + 0.3741957*z^-2
= ( 0.3741957*z + 0.3741957 ) /
(z^2);<br>
</span></div>
<div><span
style="font-family:monospace,monospace">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);<br>
</span></div>
<div>and place their numerator and
denominator to the corresponding DLR
blocks.<br>
</div>
<div>Model is in attachment. It's an
illustration, not real world
example.<br>
</div>
<div><br>
I have a question. How I can
automate the aforementioned process
programmatically?<br>
I tried to create numerator and
denominator with <span
style="font-family:monospace,monospace">poly</span>
function and as strings, but Xcos
does not support these types in DLR
settings.<br>
</div>
<div dir="ltr"><br>
--<br>
</div>
<div><i>With best regards,<br>
<span lang="en"><span>Ph.D., </span>assistant
professor at <a
moz-do-not-send="true"
href="http://mpei.ru/lang/en/Pages/default.aspx"
target="_blank">MPEI</a>,<br>
</span><span>IEEE member,</span><br>
maintainer of <a
moz-do-not-send="true"
href="http://atoms.scilab.org/toolboxes/Mathieu/"
target="_blank">Mathieu
functions toolbox for Scilab</a>,<br>
<span>Nikolay</span> Strelkov.</i><br>
</div>
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