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diff --git a/src/modules/audio_processing/splitting_filter.h b/src/modules/audio_processing/splitting_filter.h
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+++ b/src/modules/audio_processing/splitting_filter.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.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_SPLITTING_FILTER_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_SPLITTING_FILTER_H_
+
+#include "typedefs.h"
+#include "signal_processing_library.h"
+
+namespace webrtc {
+/*
+ * SplittingFilterbank_analysisQMF(...)
+ *
+ * Splits a super-wb signal into two subbands: 0-8 kHz and 8-16 kHz.
+ *
+ * Input:
+ *    - in_data  : super-wb audio signal
+ *
+ * Input & Output:
+ *    - filt_state1: Filter state for first all-pass filter
+ *    - filt_state2: Filter state for second all-pass filter
+ *
+ * Output:
+ *    - low_band : The signal from the 0-4 kHz band
+ *    - high_band  : The signal from the 4-8 kHz band
+ */
+void SplittingFilterAnalysis(const WebRtc_Word16* in_data,
+                             WebRtc_Word16* low_band,
+                             WebRtc_Word16* high_band,
+                             WebRtc_Word32* filt_state1,
+                             WebRtc_Word32* filt_state2);
+
+/*
+ * SplittingFilterbank_synthesisQMF(...)
+ *
+ * Combines the two subbands (0-8 and 8-16 kHz) into a super-wb signal.
+ *
+ * Input:
+ *    - low_band : The signal with the 0-8 kHz band
+ *    - high_band  : The signal with the 8-16 kHz band
+ *
+ * Input & Output:
+ *    - filt_state1: Filter state for first all-pass filter
+ *    - filt_state2: Filter state for second all-pass filter
+ *
+ * Output:
+ *    - out_data : super-wb speech signal
+ */
+void SplittingFilterSynthesis(const WebRtc_Word16* low_band,
+                              const WebRtc_Word16* high_band,
+                              WebRtc_Word16* out_data,
+                              WebRtc_Word32* filt_state1,
+                              WebRtc_Word32* filt_state2);
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_SPLITTING_FILTER_H_