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}
101 lines
3.9 KiB
C++
101 lines
3.9 KiB
C++
/*
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* Copyright (c) 2017 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_RESIDUAL_ECHO_ESTIMATOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
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#include <algorithm>
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#include <array>
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#include <memory>
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#include <vector>
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#include "api/array_view.h"
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#include "api/audio/echo_canceller3_config.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/aec3/aec_state.h"
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#include "modules/audio_processing/aec3/render_buffer.h"
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#include "modules/audio_processing/aec3/reverb_model.h"
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#include "modules/audio_processing/aec3/reverb_model_fallback.h"
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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class ResidualEchoEstimator {
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public:
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explicit ResidualEchoEstimator(const EchoCanceller3Config& config);
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~ResidualEchoEstimator();
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void Estimate(const AecState& aec_state,
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const RenderBuffer& render_buffer,
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const std::array<float, kFftLengthBy2Plus1>& S2_linear,
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const std::array<float, kFftLengthBy2Plus1>& Y2,
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std::array<float, kFftLengthBy2Plus1>* R2);
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// Returns the reverberant power spectrum contributions to the echo residual.
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const std::array<float, kFftLengthBy2Plus1>& GetReverbPowerSpectrum() const {
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if (echo_reverb_) {
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return echo_reverb_->GetPowerSpectrum();
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} else {
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RTC_DCHECK(echo_reverb_fallback);
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return echo_reverb_fallback->GetPowerSpectrum();
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}
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}
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private:
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// Resets the state.
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void Reset();
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// Estimates the residual echo power based on the echo return loss enhancement
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// (ERLE) and the linear power estimate.
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void LinearEstimate(const std::array<float, kFftLengthBy2Plus1>& S2_linear,
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const std::array<float, kFftLengthBy2Plus1>& erle,
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std::array<float, kFftLengthBy2Plus1>* R2);
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// Estimates the residual echo power based on the estimate of the echo path
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// gain.
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void NonLinearEstimate(float echo_path_gain,
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const std::array<float, kFftLengthBy2Plus1>& X2,
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const std::array<float, kFftLengthBy2Plus1>& Y2,
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std::array<float, kFftLengthBy2Plus1>* R2);
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// Estimates the echo generating signal power as gated maximal power over a
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// time window.
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void EchoGeneratingPower(const VectorBuffer& spectrum_buffer,
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const EchoCanceller3Config::EchoModel& echo_model,
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int headroom_spectrum_buffer,
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int filter_delay_blocks,
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bool gain_limiter_running,
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bool apply_noise_gating,
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std::array<float, kFftLengthBy2Plus1>* X2) const;
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// Updates estimate for the power of the stationary noise component in the
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// render signal.
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void RenderNoisePower(
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const RenderBuffer& render_buffer,
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std::array<float, kFftLengthBy2Plus1>* X2_noise_floor,
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std::array<int, kFftLengthBy2Plus1>* X2_noise_floor_counter) const;
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const EchoCanceller3Config config_;
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std::array<float, kFftLengthBy2Plus1> R2_old_;
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std::array<int, kFftLengthBy2Plus1> R2_hold_counter_;
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std::array<float, kFftLengthBy2Plus1> X2_noise_floor_;
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std::array<int, kFftLengthBy2Plus1> X2_noise_floor_counter_;
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const bool soft_transparent_mode_;
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const bool override_estimated_echo_path_gain_;
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std::unique_ptr<ReverbModel> echo_reverb_;
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std::unique_ptr<ReverbModelFallback> echo_reverb_fallback;
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RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(ResidualEchoEstimator);
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
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