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diff --git a/tests/manual/spectrum/spectrumapp/frequencyspectrum.h b/tests/manual/spectrum/spectrumapp/frequencyspectrum.h
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+/******************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Data Visualization module.
+**
+** $QT_BEGIN_LICENSE:COMM$
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** $QT_END_LICENSE$
+**
+******************************************************************************/
+
+#ifndef FREQUENCYSPECTRUM_H
+#define FREQUENCYSPECTRUM_H
+
+#include <QtCore/QVector>
+
+/**
+ * Represents a frequency spectrum as a series of elements, each of which
+ * consists of a frequency, an amplitude and a phase.
+ */
+class FrequencySpectrum {
+public:
+    FrequencySpectrum(int numPoints = 0);
+
+    struct Element {
+        Element()
+        :   frequency(0.0), amplitude(0.0), phase(0.0), clipped(false)
+        { }
+
+        /**
+         * Frequency in Hertz
+         */
+        qreal frequency;
+
+        /**
+         * Amplitude in range [0.0, 1.0]
+         */
+        qreal amplitude;
+
+        /**
+         * Phase in range [0.0, 2*PI]
+         */
+        qreal phase;
+
+        /**
+         * Indicates whether value has been clipped during spectrum analysis
+         */
+        bool clipped;
+    };
+
+    typedef QVector<Element>::iterator iterator;
+    typedef QVector<Element>::const_iterator const_iterator;
+
+    void reset();
+
+    int count() const;
+    Element& operator[](int index);
+    const Element& operator[](int index) const;
+    iterator begin();
+    iterator end();
+    const_iterator begin() const;
+    const_iterator end() const;
+
+private:
+    QVector<Element> m_elements;
+
+};
+
+#endif // FREQUENCYSPECTRUM_H