1 files changed, 23 insertions, 0 deletions
diff --git a/examples/6_iir_test.cpp b/examples/6_iir_test.cpp
new file mode 100644
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+++ b/examples/6_iir_test.cpp
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+/**
+ * 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 < SIZE; i++)
+		samples[i] = (1 - alpha) * samples[i] + alpha * samples[i - 1];
+	prev = samples[SIZE - 1];
+
+	return samples;
+}