1 files changed, 14 insertions, 4 deletions
diff --git a/examples/6_iir_test.cpp b/examples/6_iir_test.cpp
index 116a680..e0b266d 100644
--- a/examples/6_iir_test.cpp
+++ b/examples/6_iir_test.cpp
@@ -1,13 +1,23 @@
-Sample *process_data(Samples samples)
+/**
+ * 6_iir_test.cpp
+ * Written by Clyne Sullivan.
+ *
+ * Implements a simple infinite impulse response (IIR) filter using an alpha
+ * parameter.
+ * To build upon this example, try setting `alpha` with a parameter knob:
+ * alpha = param1() / 4095.0
+ */
+
+Sample* process_data(Samples samples)
 {
 	constexpr float alpha = 0.7;
 
 	static Sample prev = 2048;
 
 	samples[0] = (1 - alpha) * samples[0] + alpha * prev;
-	for (unsigned int i = 1; i < samples.size(); i++)
+	for (unsigned int i = 1; i < SIZE; i++)
 		samples[i] = (1 - alpha) * samples[i] + alpha * samples[i - 1];
-	prev = samples[samples.size() - 1];
+	prev = samples[SIZE - 1];
 
-	return samples.data();
+	return samples;
 }