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1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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27 Initialize(); | 27 Initialize(); |
28 } | 28 } |
29 | 29 |
30 void NoiseSpectrumEstimator::Initialize() { | 30 void NoiseSpectrumEstimator::Initialize() { |
31 std::fill(noise_spectrum_, noise_spectrum_ + arraysize(noise_spectrum_), | 31 std::fill(noise_spectrum_, noise_spectrum_ + arraysize(noise_spectrum_), |
32 kMinNoisePower); | 32 kMinNoisePower); |
33 } | 33 } |
34 | 34 |
35 void NoiseSpectrumEstimator::Update(rtc::ArrayView<const float> spectrum, | 35 void NoiseSpectrumEstimator::Update(rtc::ArrayView<const float> spectrum, |
36 bool first_update) { | 36 bool first_update) { |
37 RTC_DCHECK_EQ(65u, spectrum.size()); | 37 RTC_DCHECK_EQ(65, spectrum.size()); |
38 | 38 |
39 if (first_update) { | 39 if (first_update) { |
40 // Initialize the noise spectral estimate with the signal spectrum. | 40 // Initialize the noise spectral estimate with the signal spectrum. |
41 std::copy(spectrum.data(), spectrum.data() + spectrum.size(), | 41 std::copy(spectrum.data(), spectrum.data() + spectrum.size(), |
42 noise_spectrum_); | 42 noise_spectrum_); |
43 } else { | 43 } else { |
44 // Smoothly update the noise spectral estimate towards the signal spectrum | 44 // Smoothly update the noise spectral estimate towards the signal spectrum |
45 // such that the magnitude of the updates are limited. | 45 // such that the magnitude of the updates are limited. |
46 for (size_t k = 0; k < spectrum.size(); ++k) { | 46 for (size_t k = 0; k < spectrum.size(); ++k) { |
47 if (noise_spectrum_[k] < spectrum[k]) { | 47 if (noise_spectrum_[k] < spectrum[k]) { |
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59 // Ensure that the noise spectal estimate does not become too low. | 59 // Ensure that the noise spectal estimate does not become too low. |
60 for (auto& v : noise_spectrum_) { | 60 for (auto& v : noise_spectrum_) { |
61 v = std::max(v, kMinNoisePower); | 61 v = std::max(v, kMinNoisePower); |
62 } | 62 } |
63 | 63 |
64 data_dumper_->DumpRaw("lc_noise_spectrum", 65, noise_spectrum_); | 64 data_dumper_->DumpRaw("lc_noise_spectrum", 65, noise_spectrum_); |
65 data_dumper_->DumpRaw("lc_signal_spectrum", spectrum); | 65 data_dumper_->DumpRaw("lc_signal_spectrum", spectrum); |
66 } | 66 } |
67 | 67 |
68 } // namespace webrtc | 68 } // namespace webrtc |
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