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| 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 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_ |
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