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diff --git a/extern/audaspace/include/fx/IDynamicIIRFilterCalculator.h b/extern/audaspace/include/fx/IDynamicIIRFilterCalculator.h
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+++ b/extern/audaspace/include/fx/IDynamicIIRFilterCalculator.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 IDynamicIIRFilterCalculator.h
+ * @ingroup fx
+ * The IDynamicIIRFilterCalculator interface.
+ */
+
+#include "respec/Specification.h"
+
+#include <vector>
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * @interface IDynamicIIRFilterCalculator
+ * This interface calculates dynamic filter coefficients which depend on the
+ * sampling rate for DynamicIIRFilterReaders.
+ */
+class AUD_API IDynamicIIRFilterCalculator
+{
+public:
+	virtual ~IDynamicIIRFilterCalculator() {}
+
+	/**
+	 * Recalculates the filter coefficients.
+	 * \param rate The sample rate of the audio data.
+	 * \param[out] b The input filter coefficients.
+	 * \param[out] a The output filter coefficients.
+	 */
+	virtual void recalculateCoefficients(SampleRate rate, std::vector<float>& b, std::vector<float>& a)=0;
+};
+
+AUD_NAMESPACE_END