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diff --git a/webrtc/modules/audio_processing/ns/noise_suppression_x.h b/webrtc/modules/audio_processing/ns/noise_suppression_x.h
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+++ b/webrtc/modules/audio_processing/ns/noise_suppression_x.h
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+/*
+ *  Copyright (c) 2012 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.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_NS_NOISE_SUPPRESSION_X_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_NS_NOISE_SUPPRESSION_X_H_
+
+#include "webrtc/typedefs.h"
+
+typedef struct NsxHandleT NsxHandle;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * This function creates an instance of the fixed point Noise Suppression.
+ */
+NsxHandle* WebRtcNsx_Create();
+
+/*
+ * This function frees the dynamic memory of a specified Noise Suppression
+ * instance.
+ *
+ * Input:
+ *      - nsxInst       : Pointer to NS instance that should be freed
+ */
+void WebRtcNsx_Free(NsxHandle* nsxInst);
+
+/*
+ * This function initializes a NS instance
+ *
+ * Input:
+ *      - nsxInst       : Instance that should be initialized
+ *      - fs            : sampling frequency
+ *
+ * Output:
+ *      - nsxInst       : Initialized instance
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+int WebRtcNsx_Init(NsxHandle* nsxInst, uint32_t fs);
+
+/*
+ * This changes the aggressiveness of the noise suppression method.
+ *
+ * Input:
+ *      - nsxInst       : Instance that should be initialized
+ *      - mode          : 0: Mild, 1: Medium , 2: Aggressive
+ *
+ * Output:
+ *      - nsxInst       : Initialized instance
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+int WebRtcNsx_set_policy(NsxHandle* nsxInst, int mode);
+
+/*
+ * This functions does noise suppression for the inserted speech frame. The
+ * input and output signals should always be 10ms (80 or 160 samples).
+ *
+ * Input
+ *      - nsxInst       : NSx instance. Needs to be initiated before call.
+ *      - speechFrame   : Pointer to speech frame buffer for each band
+ *      - num_bands     : Number of bands
+ *
+ * Output:
+ *      - nsxInst       : Updated NSx instance
+ *      - outFrame      : Pointer to output frame for each band
+ */
+void WebRtcNsx_Process(NsxHandle* nsxInst,
+                       const short* const* speechFrame,
+                       int num_bands,
+                       short* const* outFrame);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_NS_NOISE_SUPPRESSION_X_H_