<span class="bp">self</span><span class="p">,</span> <span class="n">frequency</span><span class="p">:</span> <span class="nb">float</span><span class="p">):</span>
        <span class="k">if</span> <span class="p">(</span><span class="n">frequency</span> <span class="o">&lt;</span> <span class="o">-</span><span class="mf">1.0</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">frequency</span> <span class="o">&gt;</span> <span class="mf">1.0</span><span class="