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| 1 /* | 1 /* |
| 2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2014 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 |
| 11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_NONLINEAR_BEAMFORMER_H_ | 11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_NONLINEAR_BEAMFORMER_H_ |
| 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_NONLINEAR_BEAMFORMER_H_ | 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_NONLINEAR_BEAMFORMER_H_ |
| 13 | 13 |
| 14 // MSVC++ requires this to be set before any other includes to get M_PI. | 14 // MSVC++ requires this to be set before any other includes to get M_PI. |
| 15 #define _USE_MATH_DEFINES | 15 #define _USE_MATH_DEFINES |
| 16 | 16 |
| 17 #include <math.h> | 17 #include <math.h> |
| 18 | 18 |
| 19 #include <memory> | 19 #include <memory> |
| 20 #include <vector> | 20 #include <vector> |
| 21 | 21 |
| 22 #include "webrtc/common_audio/lapped_transform.h" | |
| 23 #include "webrtc/common_audio/channel_buffer.h" | 22 #include "webrtc/common_audio/channel_buffer.h" |
| 24 #include "webrtc/modules/audio_processing/beamformer/beamformer.h" | 23 #include "webrtc/modules/audio_processing/beamformer/beamformer.h" |
| 25 #include "webrtc/modules/audio_processing/beamformer/complex_matrix.h" | 24 #include "webrtc/modules/audio_processing/beamformer/complex_matrix.h" |
| 26 | 25 #include "webrtc/modules/audio_processing/utility/lapped_transform.h" |
| 27 namespace webrtc { | 26 namespace webrtc { |
| 28 | 27 |
| 29 // Enhances sound sources coming directly in front of a uniform linear array | 28 // Enhances sound sources coming directly in front of a uniform linear array |
| 30 // and suppresses sound sources coming from all other directions. Operates on | 29 // and suppresses sound sources coming from all other directions. Operates on |
| 31 // multichannel signals and produces single-channel output. | 30 // multichannel signals and produces single-channel output. |
| 32 // | 31 // |
| 33 // The implemented nonlinear postfilter algorithm taken from "A Robust Nonlinear | 32 // The implemented nonlinear postfilter algorithm taken from "A Robust Nonlinear |
| 34 // Beamforming Postprocessor" by Bastiaan Kleijn. | 33 // Beamforming Postprocessor" by Bastiaan Kleijn. |
| 35 class NonlinearBeamformer | 34 class NonlinearBeamformer |
| 36 : public Beamformer<float>, | 35 : public Beamformer<float>, |
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| 192 // Number of blocks after which the data is considered interference if the | 191 // Number of blocks after which the data is considered interference if the |
| 193 // mask does not pass |kMaskSignalThreshold|. | 192 // mask does not pass |kMaskSignalThreshold|. |
| 194 size_t hold_target_blocks_; | 193 size_t hold_target_blocks_; |
| 195 // Number of blocks since the last mask that passed |kMaskSignalThreshold|. | 194 // Number of blocks since the last mask that passed |kMaskSignalThreshold|. |
| 196 size_t interference_blocks_count_; | 195 size_t interference_blocks_count_; |
| 197 }; | 196 }; |
| 198 | 197 |
| 199 } // namespace webrtc | 198 } // namespace webrtc |
| 200 | 199 |
| 201 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_NONLINEAR_BEAMFORMER_H_ | 200 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_NONLINEAR_BEAMFORMER_H_ |
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