Fine tune the IntelligibilityEnhancer

webrtc/modules/audio_processing/intelligibility/intelligibility_utils.cc

 /*
  *  Copyright (c) 2014 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.
  */
 
 #include "webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h"
 
 #include <math.h>
 #include <stdlib.h>
 #include <string.h>
 #include <algorithm>
 #include <limits>
 
 namespace webrtc {
 
 namespace intelligibility {
 
 namespace {
 
 const float kMinFactor = 0.01f;
-const float kMaxFactor = 1000.f;
+const float kMaxFactor = 100.f;
 
 // Return |current| changed towards |target|, with the relative change being at
 // most |limit|.
 float UpdateFactor(float target, float current, float limit) {
   float gain = target / (current + std::numeric_limits<float>::epsilon());
   gain = std::min(std::max(gain, 1.f - limit), 1.f + limit);
   return std::min(std::max(current * gain, kMinFactor), kMaxFactor);;
 }
 
 }  // namespace
@@ skipping 23 matching lines @@
                         std::complex<float>* out_block) {
   for (size_t i = 0; i < num_freqs_; ++i) {
     current_[i] = UpdateFactor(target_[i], current_[i], relative_change_limit_);
     out_block[i] = sqrtf(fabsf(current_[i])) * in_block[i];
   }
 }
 
 }  // namespace intelligibility
 
 }  // namespace webrtc