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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>GStreamer Good Plugins 1.0 Plugins Reference Manual: audiocheblimit</title>
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<div class="refentry">
<a name="gst-plugins-good-plugins-audiocheblimit"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-audiocheblimit.top_of_page"></a>audiocheblimit</span></h2>
<p>audiocheblimit — Chebyshev low pass and high pass filter</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiocheblimit.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-audiocheblimit.html#GstAudioChebLimit--cutoff" title="The “cutoff” property">cutoff</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstAudioChebLimitMode</span></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-audiocheblimit.html#GstAudioChebLimit--mode" title="The “mode” property">mode</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-audiocheblimit.html#GstAudioChebLimit--poles" title="The “poles” property">poles</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-audiocheblimit.html#GstAudioChebLimit--ripple" title="The “ripple” property">ripple</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-audiocheblimit.html#GstAudioChebLimit--type" title="The “type” property">type</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstAudioChebLimit"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-audiocheblimit.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-good-plugins-audiocheblimit.html#GstAudioChebLimit-struct" title="struct GstAudioChebLimit">GstAudioChebLimit</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiocheblimit.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html">GstElement</a>
                <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseTransform.html">GstBaseTransform</a>
                    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gst-plugins-base-libs-1.0/gst-plugins-base-libs-gstaudiofilter.html#GstAudioFilter">GstAudioFilter</a>
                        <span class="lineart">╰──</span> GstAudioFXBaseIIRFilter
                            <span class="lineart">╰──</span> GstAudioChebLimit
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiocheblimit.description"></a><h2>Description</h2>
<p>Attenuates all frequencies above the cutoff frequency (low-pass) or all frequencies below the
cutoff frequency (high-pass). The number of poles and the ripple parameter control the rolloff.</p>
<p>This element has the advantage over the windowed sinc lowpass and highpass filter that it is
much faster and produces almost as good results. It's only disadvantages are the highly
non-linear phase and the slower rolloff compared to a windowed sinc filter with a large kernel.</p>
<p>For type 1 the ripple parameter specifies how much ripple in dB is allowed in the passband, i.e.
some frequencies in the passband will be amplified by that value. A higher ripple value will allow
a faster rolloff.</p>
<p>For type 2 the ripple parameter specifies the stopband attenuation. In the stopband the gain will
be at most this value. A lower ripple value will allow a faster rolloff.</p>
<p>As a special case, a Chebyshev type 1 filter with no ripple is a Butterworth filter.</p>
<div class="note"><p>
Be warned that a too large number of poles can produce noise. The most poles are possible with
a cutoff frequency at a quarter of the sampling rate.
</p></div>
<div class="refsect2">
<a name="id-1.2.17.7.8"></a><h3>Example launch line</h3>
<div class="informalexample"><pre class="programlisting">
gst-launch-1.0 audiotestsrc freq=1500 ! audioconvert ! audiocheblimit mode=low-pass cutoff=1000 poles=4 ! audioconvert ! alsasink
gst-launch-1.0 filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiocheblimit mode=high-pass cutoff=400 ripple=0.2 ! audioconvert ! alsasink
gst-launch-1.0 audiotestsrc wave=white-noise ! audioconvert ! audiocheblimit mode=low-pass cutoff=800 type=2 ! audioconvert ! alsasink
</pre></div>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.17.7.9.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
            <a class="link" href="gst-plugins-good-plugins-plugin-audiofx.html#plugin-audiofx">audiofx</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Sebastian Dröge &lt;sebastian.droege@collabora.co.uk&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Effect/Audio</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.17.7.9.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/x-raw, format=(string){ F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>audio/x-raw, format=(string){ F32LE, F64LE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string)interleaved</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiocheblimit.functions_details"></a><h2>Functions</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiocheblimit.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAudioChebLimit-struct"></a><h3>struct GstAudioChebLimit</h3>
<pre class="programlisting">struct GstAudioChebLimit;</pre>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-audiocheblimit.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioChebLimit--cutoff"></a><h3>The <code class="literal">“cutoff”</code> property</h3>
<pre class="programlisting">  “cutoff”                   <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></pre>
<p>Cut off frequency (Hz).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,100000]</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioChebLimit--mode"></a><h3>The <code class="literal">“mode”</code> property</h3>
<pre class="programlisting">  “mode”                     <span class="type">GstAudioChebLimitMode</span></pre>
<p>Low pass or high pass mode.</p>
<p>Flags: Read / Write</p>
<p>Default value: Low pass (default)</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioChebLimit--poles"></a><h3>The <code class="literal">“poles”</code> property</h3>
<pre class="programlisting">  “poles”                    <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Number of poles to use, will be rounded up to the next even number.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [2,32]</p>
<p>Default value: 4</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioChebLimit--ripple"></a><h3>The <code class="literal">“ripple”</code> property</h3>
<pre class="programlisting">  “ripple”                   <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></pre>
<p>Amount of ripple (dB).</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [0,200]</p>
<p>Default value: 0.25</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioChebLimit--type"></a><h3>The <code class="literal">“type”</code> property</h3>
<pre class="programlisting">  “type”                     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a></pre>
<p>Type of the chebychev filter.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: [1,2]</p>
<p>Default value: 1</p>
</div>
</div>
</div>
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