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diff --git a/source/use_case/ad/include/AdPostProcessing.hpp b/source/use_case/ad/include/AdPostProcessing.hpp
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+/*
+ * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ */
+#ifndef ADPOSTPROCESSING_HPP
+#define ADPOSTPROCESSING_HPP
+
+#include "TensorFlowLiteMicro.hpp"
+
+#include <vector>
+
+namespace arm {
+namespace app {
+
+    /** @brief      Dequantize TensorFlow Lite Micro tensor.
+     *  @param[in]  tensor Pointer to the TensorFlow Lite Micro tensor to be dequantized.
+     *  @return     Vector with the dequantized tensor values.
+    **/
+    template<typename T>
+    std::vector<float> Dequantize(TfLiteTensor* tensor);
+
+    /**
+     * @brief   Calculates the softmax of vector in place. **/
+    void Softmax(std::vector<float>& inputVector);
+
+
+    /** @brief      Given a wav file name return AD model output index.
+     *  @param[in]  wavFileName Audio WAV filename.
+     *                          File name should be in format <anything>_<goes>_XX_<here>.wav
+     *                          where XX is the machine ID e.g. 00, 02, 04 or 06
+     *  @return     AD model output index as 8 bit integer.
+    **/
+    int8_t OutputIndexFromFileName(std::string wavFileName);
+
+} /* namespace app */
+} /* namespace arm */
+
+#endif /* ADPOSTPROCESSING_HPP */