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  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2012-08-30 14:42:38 UTC
  • mfrom: (1.4.7)
  • Revision ID: package-import@ubuntu.com-20120830144238-c1y2og7dbm7m9nig
Tags: 5.4.0-beta-3-1~exp1
* New upstream release
* Update the scirenderer dep
* Get ride of libjhdf5-java dependency

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modules/signal_processing/help/ja_JP/filters/iir.xml
 
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<?xml version="1.0" encoding="UTF-8"?>
 
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<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:ns4="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" version="5.0-subset Scilab" xml:id="iir" xml:lang="ja">
 
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    <refnamediv>
 
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        <refname>iir</refname>
 
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        <refpurpose>iir デジタルフィルタ</refpurpose>
 
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    </refnamediv>
 
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    <refsynopsisdiv>
 
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        <title>呼び出し手順</title>
 
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        <synopsis>[hz]=iir(n,ftype,fdesign,frq,delta)</synopsis>
 
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    </refsynopsisdiv>
 
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    <refsection>
 
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        <title>パラメータ</title>
 
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        <variablelist>
 
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            <varlistentry>
 
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                <term>n</term>
 
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                <listitem>
 
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                    <para>正の整数値, フィルタの次数.</para>
 
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                </listitem>
 
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            </varlistentry>
 
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            <varlistentry>
 
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                <term>ftype</term>
 
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                <listitem>
 
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                    <para>フィルタの型を指定する文字列, 以下の値を使用可能:
 
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                        <literal>'lp'</literal> :ローパス(低域通過),<literal>'hp'</literal> : ハイパス(高域通過)
 
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                        ,<literal>'bp'</literal>: バンドパス(帯域通過), 
 
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                        <literal>'sb'</literal> : ストップバンド(帯域阻止).
 
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                    </para>
 
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                </listitem>
 
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            </varlistentry>
 
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            <varlistentry>
 
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                <term>fdesign</term>
 
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                <listitem>
 
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                    <para>アナログフィルタ設計を指定する文字列, 以下の値を指定可能:
 
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                        <literal>'butt'</literal>,
 
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                        <literal>'cheb1'</literal>, <literal>'cheb2'</literal> および
 
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                        <literal>'ellip'</literal>
 
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                    </para>
 
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                </listitem>
 
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            </varlistentry>
 
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            <varlistentry>
 
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                <term>frq</term>
 
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                <listitem>
 
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                    <para>離散カットオフ周波数の要素数2のベクトル
 
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                        (すなわち,<literal>0&lt;frq&lt;.5</literal>).
 
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                        <literal>'lp'</literal> および
 
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                        <literal>'hp'</literal> フィルタの場合,
 
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                        <literal>frq(1)</literal> が使用されます.
 
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                        <literal>'bp'</literal> および <literal>'sb'</literal> フィルタの場合,
 
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                        <literal>frq(1)</literal> が下限カットオフ周波数,
 
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                        <literal>frq(2)</literal> が上限カットオフ周波数となります.
 
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                    </para>
 
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                </listitem>
 
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            </varlistentry>
 
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            <varlistentry>
 
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                <term>delta</term>
 
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                <listitem>
 
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                    <para>
 
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                        <literal>cheb1</literal>,
 
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                        <literal>cheb2</literal>, および <literal>ellip</literal> フィルタ用
 
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                        誤差値のベクトル(要素数:2)です.
 
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                        ただし,<literal>cheb1</literal>の場合には<literal>delta(1)</literal>のみが
 
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                        使用され,<literal>cheb2</literal>の場合には<literal>delta(2)</literal>のみが
 
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                        使用されます.<literal>ellip</literal>の場合には,
 
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                        <literal>delta(1)</literal> および <literal>delta(2)</literal>の両方が
 
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                        使用されます.
 
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                        <literal>0&lt;delta(1),delta(2)&lt;1</literal>
 
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                    </para>
 
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                    <itemizedlist>
 
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                        <listitem>
 
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                            <para>
 
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                                <literal>cheb1</literal> フィルタの場合,通過域では,
 
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                                <literal>1-delta(1)&lt;ripple&lt;1</literal> です.
 
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                            </para>
 
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                        </listitem>
 
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                        <listitem>
 
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                            <para>
 
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                                <literal>cheb2</literal> フィルタの場合,阻止域では
 
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                                <literal>0&lt;ripple&lt;delta(2)</literal> です.
 
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                            </para>
 
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                        </listitem>
 
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                        <listitem>
 
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                            <para>
 
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                                <literal>ellip</literal> フィルタの場合,通過域では
 
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                                <literal>1-delta(1)&lt;ripple&lt;1</literal> ,阻止域では
 
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                                <literal>0&lt;ripple&lt;delta(2)</literal> です.
 
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                            </para>
 
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                        </listitem>
 
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                    </itemizedlist>
 
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                </listitem>
 
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            </varlistentry>
 
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        </variablelist>
 
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    </refsection>
 
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    <refsection>
 
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        <title>説明</title>
 
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        <para>
 
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            <link linkend="analpf">アナログフィルタ</link>設計および<link linkend="bilt">双一次変換</link>を用いて
 
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            IIRデジタルフィルタを設計する関数です.
 
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        </para>
 
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    </refsection>
 
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    <refsection>
 
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        <title>例</title>
 
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        <programlisting role="example"><![CDATA[ 
 
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hz=iir(3,'bp','ellip',[.15 .25],[.08 .03]);
 
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[hzm,fr]=frmag(hz,256);
 
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plot2d(fr',hzm')
 
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xtitle('Discrete IIR filter band pass  0.15&lt;fr&lt;0.25 ',' ',' ');
 
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q=poly(0,'q');     // 遅延演算子 q=z^-1 の項で結果を表わすため
 
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hzd=horner(hz,1/q) 
 
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 ]]></programlisting>
 
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    </refsection>
 
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    <refsection role="see also">
 
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        <title>参照</title>
 
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        <simplelist type="inline">
 
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            <member>
 
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                <link linkend="eqfir">eqfir</link>
 
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            </member>
 
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            <member>
 
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                <link linkend="eqiir">eqiir</link>
 
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            </member>
 
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            <member>
 
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                <link linkend="analpf">analpf</link>
 
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            </member>
 
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            <member>
 
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                <link linkend="bilt">bilt</link>
 
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            </member>
 
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        </simplelist>
 
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    </refsection>
 
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</refentry>