c98849cf92
In this CL we change the signal that controls the updates of the ERLE estimator. Until now, the render signal was used which is not optimum for reverberant signals. In this CL, a reverberation has been added to the the render signal and this new signal has been used for controlling when to update the ERLE estimator. Bug: webrtc:9873 Change-Id: I0ebea3fc208f97aa237af015ba543015d49ed978 Reviewed-on: https://webrtc-review.googlesource.com/c/105660 Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Commit-Queue: Jesus de Vicente Pena <devicentepena@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25285}
67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
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#include "api/array_view.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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namespace webrtc {
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// The ReverbModel class describes an exponential reverberant model
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// that can be applied over power spectrums.
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class ReverbModel {
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public:
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ReverbModel();
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~ReverbModel();
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// Resets the state.
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void Reset();
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// The methods AddReverbNoFreqShaping and AddReverb add the reverberation
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// contribution to an input/output power spectrum
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// Before applying the exponential reverberant model, the input power spectrum
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// is pre-scaled. Use the method AddReverb when a different scaling should be
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// applied per frequency and AddReverb_no_freq_shape if the same scaling
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// should be used for all the frequencies.
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void AddReverbNoFreqShaping(rtc::ArrayView<const float> power_spectrum,
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float power_spectrum_scaling,
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float reverb_decay,
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rtc::ArrayView<float> reverb_power_spectrum);
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void AddReverb(rtc::ArrayView<const float> power_spectrum,
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rtc::ArrayView<const float> freq_response_tail,
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float reverb_decay,
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rtc::ArrayView<float> reverb_power_spectrum);
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// Updates the reverberation contributions without applying any shaping of the
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// spectrum.
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void UpdateReverbContributionsNoFreqShaping(
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rtc::ArrayView<const float> power_spectrum,
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float power_spectrum_scaling,
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float reverb_decay);
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// Returns the current power spectrum reverberation contributions.
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rtc::ArrayView<const float> GetPowerSpectrum() const { return reverb_; }
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private:
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// Updates the reverberation contributions.
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void UpdateReverbContributions(rtc::ArrayView<const float>& power_spectrum,
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rtc::ArrayView<const float>& freq_resp_tail,
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float reverb_decay);
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std::array<float, kFftLengthBy2Plus1> reverb_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_H_
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