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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 |
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23 public: | 23 public: |
24 // A uniform covariance matrix with a gap at the target location. WARNING: | 24 // A uniform covariance matrix with a gap at the target location. WARNING: |
25 // The target angle is assumed to be 0. | 25 // The target angle is assumed to be 0. |
26 static void UniformCovarianceMatrix(float wave_number, | 26 static void UniformCovarianceMatrix(float wave_number, |
27 const std::vector<Point>& geometry, | 27 const std::vector<Point>& geometry, |
28 ComplexMatrix<float>* mat); | 28 ComplexMatrix<float>* mat); |
29 | 29 |
30 // The covariance matrix of a source at the given angle. | 30 // The covariance matrix of a source at the given angle. |
31 static void AngledCovarianceMatrix(float sound_speed, | 31 static void AngledCovarianceMatrix(float sound_speed, |
32 float angle, | 32 float angle, |
33 int frequency_bin, | 33 size_t frequency_bin, |
34 int fft_size, | 34 size_t fft_size, |
35 int num_freq_bins, | 35 size_t num_freq_bins, |
36 int sample_rate, | 36 int sample_rate, |
37 const std::vector<Point>& geometry, | 37 const std::vector<Point>& geometry, |
38 ComplexMatrix<float>* mat); | 38 ComplexMatrix<float>* mat); |
39 | 39 |
40 // Calculates phase shifts that, when applied to a multichannel signal and | 40 // Calculates phase shifts that, when applied to a multichannel signal and |
41 // added together, cause constructive interferernce for sources located at | 41 // added together, cause constructive interferernce for sources located at |
42 // the given angle. | 42 // the given angle. |
43 static void PhaseAlignmentMasks(int frequency_bin, | 43 static void PhaseAlignmentMasks(size_t frequency_bin, |
44 int fft_size, | 44 size_t fft_size, |
45 int sample_rate, | 45 int sample_rate, |
46 float sound_speed, | 46 float sound_speed, |
47 const std::vector<Point>& geometry, | 47 const std::vector<Point>& geometry, |
48 float angle, | 48 float angle, |
49 ComplexMatrix<float>* mat); | 49 ComplexMatrix<float>* mat); |
50 }; | 50 }; |
51 | 51 |
52 } // namespace webrtc | 52 } // namespace webrtc |
53 | 53 |
54 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_BF_HELPERS_H_ | 54 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_BF_HELPERS_H_ |
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