075cb2b2f7
In this work we introduce some changes on how the reverberation model for AEC3 is applied. Currently, the exponential modelling of the tails is applied over the linear echo estimates. That might result in an overestimation of the reverberation tails under certain conditions. In this work, the reverberation model is instead applied over an estimate of the energies at the tails of the linear estimate. Additionally, the stationary estimator is changed so it does not disable the aec immediately after a burst of activity. Bug: webrtc:9384,webrtc:9400,chromium:852257 Change-Id: Ia486694ed326cfe231fc688877c0b9b6e2c450ff Reviewed-on: https://webrtc-review.googlesource.com/82161 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Jesus de Vicente Pena <devicentepena@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23599}
56 lines
1.9 KiB
C++
56 lines
1.9 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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// Updates the reverberation contributions.
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void UpdateReverbContributions(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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// Adds the reverberation contributions to an input/output power spectrum.
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// - power_spectrum: Input to the exponential reverberation model.
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// - power_spectrum_scaling: A pre-scaling of the power_spectrum used
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// before applying the exponential reverberation model.
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// - reverb_decay: Parameter used by the expontial reververation model.
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void AddReverb(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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// Returns the current power spectrum reverberation contributions.
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const std::array<float, kFftLengthBy2Plus1>& GetPowerSpectrum() const {
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return reverb_;
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}
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private:
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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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