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<div class="section" id="goertzel">
<h1>Goertzel<a class="headerlink" href="#goertzel" title="Permalink to this headline">¶</a></h1>
<div class="breathe-sectiondef docutils container">
<p class="breathe-sectiondef-title rubric">Defines</p>
<dl class="define">
<dt>
<code class="sig-name descname">PI</code></dt>
<dd></dd></dl>
<dl class="define">
<dt>
<code class="sig-name descname">TAUPI</code></dt>
<dd></dd></dl>
</div>
<div class="breathe-sectiondef docutils container">
<p class="breathe-sectiondef-title rubric">Functions</p>
<dl class="function">
<dt>
double <code class="sig-name descname">double_modulo</code><span class="sig-paren">(</span>double<em> n</em>, double<em> m</em><span class="sig-paren">)</span></dt>
<dd><p>takes the modulo of a value. <dl class="simple">
<dt><strong>Return</strong></dt><dd><p>b the remainder </p>
</dd>
<dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple">
<li><p><code class="docutils literal notranslate"><span class="pre">n</span></code>: the starting value </p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">m</span></code>: the divisor </p></li>
</ul>
</dd>
</dl>
</p>
</dd></dl>
<dl class="function">
<dt>
double complex <code class="sig-name descname">goertzel_coefficients</code><span class="sig-paren">(</span>double *<em> ringbuffer_data</em>, int<em> ringbuffer_len</em>, int<em> target_frequency</em>, int<em> sampling_rate</em><span class="sig-paren">)</span></dt>
<dd><p>calculates the Goertzel transformation</p>
<p><dl class="simple">
<dt><strong>Return</strong></dt><dd><p>a complex value calculated for the target_frequency </p>
</dd>
<dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple">
<li><p><code class="docutils literal notranslate"><span class="pre">ringbuffer_data</span></code>: a pointer to the data array in the ringbuffer </p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">ringbuffer_len</span></code>: how many past samples to use for the algorithm </p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">target_frequency</span></code>: for which frequency to calculate the transformation </p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">sampling_rate</span></code>: the sampling rate of the data in the ringbuffer </p></li>
</ul>
</dd>
</dl>
</p>
</dd></dl>
<dl class="function">
<dt>
double <code class="sig-name descname">calc_power</code><span class="sig-paren">(</span>double complex<em> z</em><span class="sig-paren">)</span></dt>
<dd><p>calculates the power from a precomputed complex number </p>
</dd></dl>
<dl class="function">
<dt>
double <code class="sig-name descname">calc_phase</code><span class="sig-paren">(</span>double complex<em> z</em><span class="sig-paren">)</span></dt>
<dd><p>calculates the phase from a precomputed complex number </p>
</dd></dl>
<dl class="function">
<dt>
int <code class="sig-name descname">phase_to_trigger</code><span class="sig-paren">(</span>double<em> current_phase</em>, double<em> last_phase</em>, double<em> target_phase</em><span class="sig-paren">)</span></dt>
<dd><p>decides if the target phase will be reached in the next step @params: double current_phase: Current phase double last_phase: Last phase double: target_phase: Target phase <ul class="simple">
<li><p>1 for true (target phase will be reached in next step) </p></li>
</ul>
<dl class="simple">
<dt><strong>Return</strong></dt><dd><p>:<ul class="simple">
<li><p>0 for false (will not reach target phase)</p></li>
</ul>
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