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 MODULES_AUDIO_PROCESSING_ECHO_DETECTOR_MEAN_VARIANCE_ESTIMATOR_H_ 12 #define 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 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 // MODULES_AUDIO_PROCESSING_ECHO_DETECTOR_MEAN_VARIANCE_ESTIMATOR_H_ 34