e descname"><span class="pre">notch</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">n_freq</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pecg/Preprocessing.html#Preprocessing.notch"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#pec