>N</code></strong> :&ensp;<code>int</code></dt>
<dd>Length of the filter.</dd>
<dt><strong><code>X</code></strong> :&ensp;<code>array, shape=(n_channels, n_samples)</code></dt>
<dd>The raw data.</dd>
<dt><strong><code>Zi</code></strong> :&ensp;<code>array</code></dt>
<dd>The initial filter conditions.</dd>
</dl>
<h2 id="returns">Returns</h2>
<dl>
<dt><strong><code>X</code></strong> :&ensp;<code>array</code></dt>
<dd>The filtered data.</dd>
<dt><strong><code>Zf</code></strong> :&ensp;<code>array</code></dt>
