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diff --git a/extern/audaspace/include/fx/IIRFilter.h b/extern/audaspace/include/fx/IIRFilter.h
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+++ b/extern/audaspace/include/fx/IIRFilter.h
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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file IIRFilter.h
+ * @ingroup fx
+ * The IIRFilter class.
+ */
+
+#include "fx/Effect.h"
+
+#include <vector>
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This sound creates a IIR filter reader.
+ */
+class AUD_API IIRFilter : public Effect
+{
+private:
+	/**
+	 * Output filter coefficients.
+	 */
+	std::vector<float> m_a;
+
+	/**
+	 * Input filter coefficients.
+	 */
+	std::vector<float> m_b;
+
+	// delete copy constructor and operator=
+	IIRFilter(const IIRFilter&) = delete;
+	IIRFilter& operator=(const IIRFilter&) = delete;
+
+public:
+	/**
+	 * Creates a new IIR filter sound.
+	 * \param sound The input sound.
+	 * \param b The input filter coefficients.
+	 * \param a The output filter coefficients.
+	 */
+	IIRFilter(std::shared_ptr<ISound> sound, const std::vector<float>& b, const std::vector<float>& a);
+
+	virtual std::shared_ptr<IReader> createReader();
+};
+
+AUD_NAMESPACE_END