class="n">np</span><span class="o">.</span><span class="n">exp</span><span class="p">(</span><span class="mi">1</span><span class="n">j</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">angle</span><span class="p">(</span><span class="n">stft</span><span class="p">(</span><span class="n">y_i</span><span class="p">,</span> <span class="n">ana_hop</span><span class="o">=</span><span class="n">syn_hop</span><span class="p">,</span> <span class="n">win_length</span><