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diff --git a/src/ipa/raspberrypi/controller/rpi/noise.hpp b/src/ipa/raspberrypi/controller/rpi/noise.hpp
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+++ b/src/ipa/raspberrypi/controller/rpi/noise.hpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * noise.hpp - Noise control algorithm
+ */
+#pragma once
+
+#include "../algorithm.hpp"
+#include "../noise_status.h"
+
+// This is our implementation of the "noise algorithm".
+
+namespace RPi {
+
+class Noise : public Algorithm
+{
+public:
+	Noise(Controller *controller);
+	char const *Name() const override;
+	void SwitchMode(CameraMode const &camera_mode) override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void Prepare(Metadata *image_metadata) override;
+
+private:
+	// the noise profile for analogue gain of 1.0
+	double reference_constant_;
+	double reference_slope_;
+	std::atomic<double> mode_factor_;
+};
+
+} // namespace RPi