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diff --git a/src/common_audio/vad/main/source/vad_const.h b/src/common_audio/vad/main/source/vad_const.h
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+++ b/src/common_audio/vad/main/source/vad_const.h
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+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This header file includes the declarations of the internally used constants.
+ */
+
+#ifndef WEBRTC_VAD_CONST_H_
+#define WEBRTC_VAD_CONST_H_
+
+#include "typedefs.h"
+
+// TODO(ajm): give these internal-linkage by moving to the appropriate file
+// where possible, and otherwise tag with WebRtcVad_.
+
+// Spectrum Weighting
+extern const WebRtc_Word16 kSpectrumWeight[];
+extern const WebRtc_Word16 kCompVar;
+// Logarithm constant
+extern const WebRtc_Word16 kLogConst;
+extern const WebRtc_Word16 kLog10Const;
+// Q15
+extern const WebRtc_Word16 kNoiseUpdateConst;
+extern const WebRtc_Word16 kSpeechUpdateConst;
+// Q8
+extern const WebRtc_Word16 kBackEta;
+// Coefficients used by WebRtcVad_HpOutput, Q14
+extern const WebRtc_Word16 kHpZeroCoefs[];
+extern const WebRtc_Word16 kHpPoleCoefs[];
+// Allpass filter coefficients, upper and lower, in Q15 resp. Q13
+extern const WebRtc_Word16 kAllPassCoefsQ15[];
+extern const WebRtc_Word16 kAllPassCoefsQ13[];
+// Minimum difference between the two models, Q5
+extern const WebRtc_Word16 kMinimumDifference[];
+// Maximum value when updating the speech model, Q7
+extern const WebRtc_Word16 kMaximumSpeech[];
+// Minimum value for mean value
+extern const WebRtc_Word16 kMinimumMean[];
+// Upper limit of mean value for noise model, Q7
+extern const WebRtc_Word16 kMaximumNoise[];
+// Adjustment for division with two in WebRtcVad_SplitFilter
+extern const WebRtc_Word16 kOffsetVector[];
+// Start values for the Gaussian models, Q7
+extern const WebRtc_Word16 kNoiseDataWeights[];
+extern const WebRtc_Word16 kSpeechDataWeights[];
+extern const WebRtc_Word16 kNoiseDataMeans[];
+extern const WebRtc_Word16 kSpeechDataMeans[];
+extern const WebRtc_Word16 kNoiseDataStds[];
+extern const WebRtc_Word16 kSpeechDataStds[];
+
+#endif // WEBRTC_VAD_CONST_H_