code changes by Sonu Sharma during FOSSEE Fellowship 2018

1 files changed, 19 insertions, 19 deletions

diff --git a/help/en_US/besself.xml b/help/en_US/besself.xml
index b792eaf..f7456d9 100644
--- a/help/en_US/besself.xml
+++ b/help/en_US/besself.xml
@@ -17,18 +17,19 @@
 
   <refnamediv>
     <refname>besself</refname>
-    <refpurpose>This function generates a Bessel filter.</refpurpose>
+    <refpurpose>Bessel filter design.</refpurpose>
   </refnamediv>
 
 
 <refsynopsisdiv>
    <title>Calling Sequence</title>
    <synopsis>
-   [a, b] = besself(n, w)
-   [a, b] = besself (n, w, "high")
-   [a, b, c] = besself (…)
-   [a, b, c, d] = besself (…)
-   […] = besself (…, "z")
+[b, a] = besself(n, Wc)
+[b, a] = besself (n, Wc, "high")
+[b, a] = besself (n, [Wl, Wh])
+[b, a] = besself (n, [Wl, Wh], "stop")
+[z, p, g] = besself (…)
+[…] = besself (…, "z")
    </synopsis>
 </refsynopsisdiv>
 
@@ -36,31 +37,30 @@
    <title>Parameters</title>
    <variablelist>
    <varlistentry><term>n:</term>
-      <listitem><para> positive integer value</para></listitem></varlistentry>
-   <varlistentry><term>w:</term>
-      <listitem><para> positive real value</para></listitem></varlistentry>
+      <listitem><para> positive integer value (order of filter)</para></listitem></varlistentry>
+   <varlistentry><term>W:</term>
+      <listitem><para> positive real value</para><para>    1).Analog 3dB cutoff frequency/frequencies for analog filter, in the range [0, Inf] {rad/sec}</para><para>    2).Normalised digital 3dB cutoff frequency/frequencies for digital filter, in the range [0, 1] {dimensionless}</para></listitem></varlistentry>
    </variablelist>
 </refsection>
 
 <refsection>
    <title>Description</title>
    <para>
-This is an Octave function.
-This function generates a Bessel filter. The default is a Laplace space (s) filter.
-The third parameter takes in high or low, the default value being low. The cutoff is pi*Wc radians.
-[z,p,g] = besself(...) returns filter as zero-pole-gain rather than coefficients of the numerator and denominator polynomials.
-[...] = besself(...,’z’) returns a discrete space (Z) filter. w must be less than 1.
-[a,b,c,d] = besself(...) returns state-space matrices.
+This function generates a Bessel filter. The default is a Laplace space (s)  or analog filter.</para>
+<para>If second argument is scalar the third parameter takes in high or low, the default value being low. The cutoff is Wc rad/sec.</para>
+<para>If second argument is vector of length 2 ie [Wl Wh] then third parameter may be pass or stop default is pass for bandpass and band reject filter respectively</para>
+<para>[z,p,g] = besself(...) returns filter as zero-pole-gain rather than coefficients of the numerator and denominator polynomials.</para>
+<para>[...] = besself(...,’z’) returns a discrete space (Z) filter. Wc must be less than 1 {dimensionless}.
 </para>
 </refsection>
 
 <refsection>
    <title>Examples</title>
    <programlisting role="example"><![CDATA[
-[a,b]=besself(2,3,"low")
-a =  9.0000
-b =
-1.0000   5.1962   9.0000
+n = 2;
+wc = 0.3;
+[b, a]=besself(n, wc, "high", "z")
+
    ]]></programlisting>
 </refsection>
 </refentry>