t__item"><a href="../../exercise/3/5.html#ex3.72">3.72</a></li></ul></aside>
<h3 id="3.5.3.3" class="anchor">
<a class="anchor__link link" href="#3.5.3.3" aria-hidden="true">#</a> Streams as signals
</h3>
<ul>
<li>We can use streams to model signal-processing systems.</li>
<li>For example, taking the integral of a signal:</li>
</ul>
<pre><code class="codeblock">(<span class="kw">define</span> (integral integrand initial-value dt)
  (<span class="kw">define</span> int
    (<span class="kw">cons-stream</span>