></strong> :&ensp;<code>array, shape=(n_channels, filter_order)</code></dt>
<dd>Initial conditions.</dd>
<dt><strong><code>a</code></strong>, <strong><code>b</code></strong> :&ensp;<code>2-tuple | None</code></dt>
<dd>Coefficients of an IIR filter that is used to shape the spectrum of
the signal when calculating artifact statistics. The output signal
does not go through this filter. This is an optional way to tune the
sensitivity of the algorithm to each frequency component of the
signal. The default filter