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<h1>Digital Filter Design</h1> </div>
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Classes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__firdes.html">gr_firdes</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Finite Impulse Response (FIR) filter design functions. <a href="classgr__firdes.html#_details">More...</a><br/></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classstd_1_1vector.html">std::vector</a>< double > </td><td class="memItemRight" valign="bottom"><a class="el" href="group__filter__design.html#ga46cf4a6243c0610020572566e1a3198b">gr_remez</a> (int order, const <a class="el" href="classstd_1_1vector.html">std::vector</a>< double > &bands, const <a class="el" href="classstd_1_1vector.html">std::vector</a>< double > &ampl, const <a class="el" href="classstd_1_1vector.html">std::vector</a>< double > &error_weight, const std::string filter_type="bandpass", int grid_density=16) throw (std::runtime_error)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Parks-McClellan FIR filter design. <a href="#ga46cf4a6243c0610020572566e1a3198b"></a><br/></td></tr>
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<td class="memname"><a class="el" href="classstd_1_1vector.html">std::vector</a><double> gr_remez </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>order</em>, </td>
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<td class="paramtype">const <a class="el" href="classstd_1_1vector.html">std::vector</a>< double > & </td>
<td class="paramname"><em>bands</em>, </td>
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<td class="paramtype">const <a class="el" href="classstd_1_1vector.html">std::vector</a>< double > & </td>
<td class="paramname"><em>ampl</em>, </td>
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<td class="paramtype">const <a class="el" href="classstd_1_1vector.html">std::vector</a>< double > & </td>
<td class="paramname"><em>error_weight</em>, </td>
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<td class="paramtype">const std::string </td>
<td class="paramname"><em>filter_type</em> = <code>"bandpass"</code>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>grid_density</em> = <code>16</code> </td>
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<td></td><td> throw (std::runtime_error)</td>
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<p>Parks-McClellan FIR filter design. </p>
<p>Calculates the optimal (in the Chebyshev/minimax sense) FIR filter inpulse reponse given a set of band edges, the desired reponse on those bands, and the weight given to the error in those bands.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">order</td><td>filter order (number of taps in the returned filter - 1) </td></tr>
<tr><td class="paramname">bands</td><td>frequency at the band edges [ b1 e1 b2 e2 b3 e3 ...] </td></tr>
<tr><td class="paramname">ampl</td><td>desired amplitude at the band edges [ a(b1) a(e1) a(b2) a(e2) ...] </td></tr>
<tr><td class="paramname">error_weight</td><td>weighting applied to each band (usually 1) </td></tr>
<tr><td class="paramname">filter_type</td><td>one of "bandpass", "hilbert" or "differentiator" </td></tr>
<tr><td class="paramname">grid_density</td><td>determines how accurately the filter will be constructed. \ The minimum value is 16; higher values are slower to compute.</td></tr>
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</dl>
<p>Frequency is in the range [0, 1], with 1 being the Nyquist frequency (Fs/2)</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>vector of computed taps</dd></dl>
<dl><dt><b>Exceptions:</b></dt><dd>
<table class="exception">
<tr><td class="paramname">std::runtime_error</td><td>if args are invalid or calculation fails to converge. </td></tr>
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