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diff --git a/src/modules/audio_processing/ns/defines.h b/src/modules/audio_processing/ns/defines.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_NS_MAIN_SOURCE_DEFINES_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_
+
+//#define PROCESS_FLOW_0    // Use the traditional method.
+//#define PROCESS_FLOW_1    // Use traditional with DD estimate of prior SNR.
+#define PROCESS_FLOW_2    // Use the new method of speech/noise classification.
+
+#define BLOCKL_MAX          160 // max processing block length: 160
+#define ANAL_BLOCKL_MAX     256 // max analysis block length: 256
+#define HALF_ANAL_BLOCKL    129 // half max analysis block length + 1
+
+#define QUANTILE            (float)0.25
+
+#define SIMULT              3
+#define END_STARTUP_LONG    200
+#define END_STARTUP_SHORT   50
+#define FACTOR              (float)40.0
+#define WIDTH               (float)0.01
+
+#define SMOOTH              (float)0.75 // filter smoothing
+// Length of fft work arrays.
+#define IP_LENGTH (ANAL_BLOCKL_MAX >> 1) // must be at least ceil(2 + sqrt(ANAL_BLOCKL_MAX/2))
+#define W_LENGTH (ANAL_BLOCKL_MAX >> 1)
+
+//PARAMETERS FOR NEW METHOD
+#define DD_PR_SNR           (float)0.98 // DD update of prior SNR
+#define LRT_TAVG            (float)0.50 // tavg parameter for LRT (previously 0.90)
+#define SPECT_FL_TAVG       (float)0.30 // tavg parameter for spectral flatness measure
+#define SPECT_DIFF_TAVG     (float)0.30 // tavg parameter for spectral difference measure
+#define PRIOR_UPDATE        (float)0.10 // update parameter of prior model
+#define NOISE_UPDATE        (float)0.90 // update parameter for noise
+#define SPEECH_UPDATE       (float)0.99 // update parameter when likely speech
+#define WIDTH_PR_MAP        (float)4.0  // width parameter in sigmoid map for prior model
+#define LRT_FEATURE_THR     (float)0.5  // default threshold for LRT feature
+#define SF_FEATURE_THR      (float)0.5  // default threshold for Spectral Flatness feature
+#define SD_FEATURE_THR      (float)0.5  // default threshold for Spectral Difference feature
+#define PROB_RANGE          (float)0.20 // probability threshold for noise state in
+                                        // speech/noise likelihood
+#define HIST_PAR_EST         1000       // histogram size for estimation of parameters
+#define GAMMA_PAUSE         (float)0.05 // update for conservative noise estimate
+//
+#define B_LIM               (float)0.5  // threshold in final energy gain factor calculation
+#endif // WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_