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diff --git a/samples/KeywordSpotting/include/DsCNNPreprocessor.hpp b/samples/KeywordSpotting/include/DsCNNPreprocessor.hpp
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+++ b/samples/KeywordSpotting/include/DsCNNPreprocessor.hpp
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+//
+// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#ifndef KEYWORD_SPOTTING_EXAMPLE_DSCNNPREPROCESSOR_HPP
+#define KEYWORD_SPOTTING_EXAMPLE_DSCNNPREPROCESSOR_HPP
+
+#include <numeric>
+#include "DsCnnMfcc.hpp"
+
+namespace kws 
+{
+class DsCNNPreprocessor
+{
+public:
+    DsCNNPreprocessor(uint32_t windowLen, uint32_t windowStride,
+                      std::unique_ptr<DsCnnMFCC> mfccInst);
+
+    /**
+    * @brief       Calculates the features required from audio data. This
+    *              includes MFCC, first and second order deltas,
+    *              normalisation and finally, quantisation. The tensor is
+    *              populated with feature from a given window placed along
+    *              in a single row.
+    * @param[in]   audioData     pointer to the first element of audio data
+    * @param[in]   output        output to be populated
+    * @return      true if successful, false in case of error.
+    */
+    std::vector<int8_t> Invoke(const float* audioData, 
+                               size_t dataSize,
+                               int quantOffset,
+                               float quantScale) ;
+
+    uint32_t m_windowLen;       // Window length for MFCC
+    uint32_t m_windowStride;    // Window stride len for MFCC
+    std::unique_ptr<MFCC> m_mfcc;
+};
+} // namespace kws
+#endif //KEYWORD_SPOTTING_EXAMPLE_DSCNNPREPROCESSOR_HPP