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<p>base class template for Infinite Impulse Response filter (IIR)
<a href="classgri__iir.html#details">More...</a></p>
<p><code>#include <<a class="el" href="gri__iir_8h_source.html">gri_iir.h</a>></code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a79ac3f84ffeb3c6190b249a639b0f2ca"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#a79ac3f84ffeb3c6190b249a639b0f2ca">gri_iir</a> (const std::vector< tap_type > &fftaps, const std::vector< tap_type > &fbtaps) throw (std::invalid_argument)</td></tr>
<tr class="memdesc:a79ac3f84ffeb3c6190b249a639b0f2ca"><td class="mdescLeft"> </td><td class="mdescRight">Construct an IIR with the given taps. <a href="#a79ac3f84ffeb3c6190b249a639b0f2ca"></a><br/></td></tr>
<tr class="separator:a79ac3f84ffeb3c6190b249a639b0f2ca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9e7ea537a27b610aa96ba407be82831d"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#a9e7ea537a27b610aa96ba407be82831d">gri_iir</a> ()</td></tr>
<tr class="separator:a9e7ea537a27b610aa96ba407be82831d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a50545f86e1ab90ef36893d3a2b81fb2f"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#a50545f86e1ab90ef36893d3a2b81fb2f">~gri_iir</a> ()</td></tr>
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<tr class="memitem:adb60d3d25c5fce9278d8f2cd5e3c74cb"><td class="memItemLeft" align="right" valign="top">o_type </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#adb60d3d25c5fce9278d8f2cd5e3c74cb">filter</a> (const i_type input)</td></tr>
<tr class="memdesc:adb60d3d25c5fce9278d8f2cd5e3c74cb"><td class="mdescLeft"> </td><td class="mdescRight">compute a single output value. <a href="#adb60d3d25c5fce9278d8f2cd5e3c74cb"></a><br/></td></tr>
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<tr class="memitem:aef452a0ffbc9d9040b08d58d0bbe0589"><td class="memItemLeft" align="right" valign="top"><a class="el" href="volk_8tmpl_8h.html#a8dc2b7da310a28e667530ba0e8ca4cc4">void</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#aef452a0ffbc9d9040b08d58d0bbe0589">filter_n</a> (o_type output[], const i_type input[], long n)</td></tr>
<tr class="memdesc:aef452a0ffbc9d9040b08d58d0bbe0589"><td class="mdescLeft"> </td><td class="mdescRight">compute an array of N output values. <code>input</code> must have N valid entries. <a href="#aef452a0ffbc9d9040b08d58d0bbe0589"></a><br/></td></tr>
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<tr class="memitem:a82e9ff44853cc878f317b5405e786038"><td class="memItemLeft" align="right" valign="top">unsigned </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#a82e9ff44853cc878f317b5405e786038">ntaps_ff</a> () const </td></tr>
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<tr class="memitem:afe39444b015e40596401bc98c613264b"><td class="memItemLeft" align="right" valign="top">unsigned </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#afe39444b015e40596401bc98c613264b">ntaps_fb</a> () const </td></tr>
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<tr class="memitem:abbc8febf2bccd566121688c66b0b0326"><td class="memItemLeft" align="right" valign="top"><a class="el" href="volk_8tmpl_8h.html#a8dc2b7da310a28e667530ba0e8ca4cc4">void</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#abbc8febf2bccd566121688c66b0b0326">set_taps</a> (const std::vector< tap_type > &fftaps, const std::vector< tap_type > &fbtaps) throw (std::invalid_argument)</td></tr>
<tr class="memdesc:abbc8febf2bccd566121688c66b0b0326"><td class="mdescLeft"> </td><td class="mdescRight">install new taps. <a href="#abbc8febf2bccd566121688c66b0b0326"></a><br/></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr class="memitem:aadd595c780fc6b2ee50c7c8b3eb5eea3"><td class="memItemLeft" align="right" valign="top">std::vector< tap_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#aadd595c780fc6b2ee50c7c8b3eb5eea3">d_fftaps</a></td></tr>
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<tr class="memitem:ae270ca4360515fbd80cf9ad513b96f24"><td class="memItemLeft" align="right" valign="top">std::vector< tap_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#ae270ca4360515fbd80cf9ad513b96f24">d_fbtaps</a></td></tr>
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<tr class="memitem:af7e5eba6e33011c68e168a1b75ed2baa"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#af7e5eba6e33011c68e168a1b75ed2baa">d_latest_n</a></td></tr>
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<tr class="memitem:a325cbd21166ec28dc27ca0feccef7b38"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#a325cbd21166ec28dc27ca0feccef7b38">d_latest_m</a></td></tr>
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<tr class="memitem:a566a5d039cf32bb27a750b123e8dae7a"><td class="memItemLeft" align="right" valign="top">std::vector< tap_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#a566a5d039cf32bb27a750b123e8dae7a">d_prev_output</a></td></tr>
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<tr class="memitem:aac5a985051761be98d5753f5a1542003"><td class="memItemLeft" align="right" valign="top">std::vector< i_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgri__iir.html#aac5a985051761be98d5753f5a1542003">d_prev_input</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<class i_type, class o_type, class tap_type><br/>
class gri_iir< i_type, o_type, tap_type ></h3>
<p>base class template for Infinite Impulse Response filter (IIR) </p>
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<p>Construct an IIR with the given taps. </p>
<p>This filter uses the Direct Form I implementation, where <code>fftaps</code> contains the feed-forward taps, and <code>fbtaps</code> the feedback ones.</p>
<p><code>fftaps</code> and <code>fbtaps</code> must have equal numbers of taps</p>
<p>The input and output satisfy a difference equation of the form</p>
<p class="formulaDsp">
<img class="formulaDsp" alt="\[ y[n] - \sum_{k=1}^{M} a_k y[n-k] = \sum_{k=0}^{N} b_k x[n-k] \]" src="form_0.png"/>
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<p>with the corresponding rational system function</p>
<p class="formulaDsp">
<img class="formulaDsp" alt="\[ H(z) = \frac{\sum_{k=0}^{N} b_k z^{-k}}{1 - \sum_{k=1}^{M} a_k z^{-k}} \]" src="form_1.png"/>
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<p>Note that some texts define the system function with a + in the denominator. If you're using that convention, you'll need to negate the feedback taps. </p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<p>compute a single output value. </p>
<dl class="section return"><dt>Returns</dt><dd>the filtered input value. </dd></dl>
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<p>compute an array of N output values. <code>input</code> must have N valid entries. </p>
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<td class="memname">unsigned <a class="el" href="classgri__iir.html">gri_iir</a>< i_type, o_type, tap_type >::ntaps_fb </td>
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<dl class="section return"><dt>Returns</dt><dd>number of taps in filter. </dd></dl>
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<p>install new taps. </p>
<p>Referenced by <a class="el" href="classgri__iir.html#a79ac3f84ffeb3c6190b249a639b0f2ca">gri_iir< float, float, double >::gri_iir()</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<p>Referenced by <a class="el" href="classgri__iir.html#afe39444b015e40596401bc98c613264b">gri_iir< float, float, double >::ntaps_fb()</a>, and <a class="el" href="classgri__iir.html#abbc8febf2bccd566121688c66b0b0326">gri_iir< float, float, double >::set_taps()</a>.</p>
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<p>Referenced by <a class="el" href="classgri__iir.html#a82e9ff44853cc878f317b5405e786038">gri_iir< float, float, double >::ntaps_ff()</a>, and <a class="el" href="classgri__iir.html#abbc8febf2bccd566121688c66b0b0326">gri_iir< float, float, double >::set_taps()</a>.</p>
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<td class="memname">int <a class="el" href="classgri__iir.html">gri_iir</a>< i_type, o_type, tap_type >::d_latest_m</td>
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<p>Referenced by <a class="el" href="classgri__iir.html#abbc8febf2bccd566121688c66b0b0326">gri_iir< float, float, double >::set_taps()</a>.</p>
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<td class="memname">int <a class="el" href="classgri__iir.html">gri_iir</a>< i_type, o_type, tap_type >::d_latest_n</td>
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<p>Referenced by <a class="el" href="classgri__iir.html#abbc8febf2bccd566121688c66b0b0326">gri_iir< float, float, double >::set_taps()</a>.</p>
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<td class="memname">std::vector<i_type> <a class="el" href="classgri__iir.html">gri_iir</a>< i_type, o_type, tap_type >::d_prev_input</td>
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<p>Referenced by <a class="el" href="classgri__iir.html#abbc8febf2bccd566121688c66b0b0326">gri_iir< float, float, double >::set_taps()</a>.</p>
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template<class i_type, class o_type, class tap_type> </div>
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<td class="memname">std::vector<tap_type> <a class="el" href="classgri__iir.html">gri_iir</a>< i_type, o_type, tap_type >::d_prev_output</td>
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<span class="mlabels"><span class="mlabel">protected</span></span> </td>
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<p>Referenced by <a class="el" href="classgri__iir.html#abbc8febf2bccd566121688c66b0b0326">gri_iir< float, float, double >::set_taps()</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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