Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_ECHO_DETECTOR_MEAN_VARIANCE_ESTIMATOR_H_
      12             : #define WEBRTC_MODULES_AUDIO_PROCESSING_ECHO_DETECTOR_MEAN_VARIANCE_ESTIMATOR_H_
      13             : 
      14             : namespace webrtc {
      15             : 
      16             : // This class iteratively estimates the mean and variance of a signal.
      17           0 : class MeanVarianceEstimator {
      18             :  public:
      19             :   void Update(float value);
      20             :   float std_deviation() const;
      21             :   float mean() const;
      22             :   void Clear();
      23             : 
      24             :  private:
      25             :   // Estimate of the expected value of the input values.
      26             :   float mean_ = 0.f;
      27             :   // Estimate of the variance of the input values.
      28             :   float variance_ = 0.f;
      29             : };
      30             : 
      31             : }  // namespace webrtc
      32             : 
      33             : #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_ECHO_DETECTOR_MEAN_VARIANCE_ESTIMATOR_H_