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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 #include "webrtc/modules/audio_processing/echo_detector/normalized_covariance_es
timator.h" |
| 12 |
| 13 namespace webrtc { |
| 14 namespace { |
| 15 |
| 16 // Parameter controlling the adaptation speed. |
| 17 constexpr float kAlpha = 0.01f; |
| 18 |
| 19 } // namespace |
| 20 |
| 21 void NormalizedCovarianceEstimator::Update(float x, |
| 22 float x_mean, |
| 23 float x_sigma, |
| 24 float y, |
| 25 float y_mean, |
| 26 float y_sigma) { |
| 27 covariance_ = |
| 28 (1.f - kAlpha) * covariance_ + kAlpha * (x - x_mean) * (y - y_mean); |
| 29 normalized_cross_correlation_ = covariance_ / (x_sigma * y_sigma + .0001f); |
| 30 } |
| 31 |
| 32 void NormalizedCovarianceEstimator::Clear() { |
| 33 covariance_ = 0.f; |
| 34 normalized_cross_correlation_ = 0.f; |
| 35 } |
| 36 |
| 37 } // namespace webrtc |
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