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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 #define _USE_MATH_DEFINES | 11 #define _USE_MATH_DEFINES |
12 | 12 |
13 #include "webrtc/modules/audio_processing/beamformer/covariance_matrix_generator
.h" | 13 #include "webrtc/modules/audio_processing/beamformer/covariance_matrix_generator
.h" |
14 | 14 |
15 #include <cmath> | 15 #include <cmath> |
16 | 16 |
| 17 namespace webrtc { |
17 namespace { | 18 namespace { |
18 | 19 |
19 float BesselJ0(float x) { | 20 float BesselJ0(float x) { |
20 #if WEBRTC_WIN | 21 #if WEBRTC_WIN |
21 return _j0(x); | 22 return _j0(x); |
22 #else | 23 #else |
23 return j0(x); | 24 return j0(x); |
24 #endif | 25 #endif |
25 } | 26 } |
26 | 27 |
| 28 // Calculates the Euclidean norm for a row vector. |
| 29 float Norm(const ComplexMatrix<float>& x) { |
| 30 RTC_CHECK_EQ(1, x.num_rows()); |
| 31 const size_t length = x.num_columns(); |
| 32 const complex<float>* elems = x.elements()[0]; |
| 33 float result = 0.f; |
| 34 for (size_t i = 0u; i < length; ++i) { |
| 35 result += std::norm(elems[i]); |
| 36 } |
| 37 return std::sqrt(result); |
| 38 } |
| 39 |
27 } // namespace | 40 } // namespace |
28 | 41 |
29 namespace webrtc { | |
30 | |
31 void CovarianceMatrixGenerator::UniformCovarianceMatrix( | 42 void CovarianceMatrixGenerator::UniformCovarianceMatrix( |
32 float wave_number, | 43 float wave_number, |
33 const std::vector<Point>& geometry, | 44 const std::vector<Point>& geometry, |
34 ComplexMatrix<float>* mat) { | 45 ComplexMatrix<float>* mat) { |
35 RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_rows()); | 46 RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_rows()); |
36 RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns()); | 47 RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns()); |
37 | 48 |
38 complex<float>* const* mat_els = mat->elements(); | 49 complex<float>* const* mat_els = mat->elements(); |
39 for (size_t i = 0; i < geometry.size(); ++i) { | 50 for (size_t i = 0; i < geometry.size(); ++i) { |
40 for (size_t j = 0; j < geometry.size(); ++j) { | 51 for (size_t j = 0; j < geometry.size(); ++j) { |
(...skipping 21 matching lines...) Expand all Loading... |
62 | 73 |
63 ComplexMatrix<float> interf_cov_vector(1, geometry.size()); | 74 ComplexMatrix<float> interf_cov_vector(1, geometry.size()); |
64 ComplexMatrix<float> interf_cov_vector_transposed(geometry.size(), 1); | 75 ComplexMatrix<float> interf_cov_vector_transposed(geometry.size(), 1); |
65 PhaseAlignmentMasks(frequency_bin, | 76 PhaseAlignmentMasks(frequency_bin, |
66 fft_size, | 77 fft_size, |
67 sample_rate, | 78 sample_rate, |
68 sound_speed, | 79 sound_speed, |
69 geometry, | 80 geometry, |
70 angle, | 81 angle, |
71 &interf_cov_vector); | 82 &interf_cov_vector); |
| 83 interf_cov_vector.Scale(1.f / Norm(interf_cov_vector)); |
72 interf_cov_vector_transposed.Transpose(interf_cov_vector); | 84 interf_cov_vector_transposed.Transpose(interf_cov_vector); |
73 interf_cov_vector.PointwiseConjugate(); | 85 interf_cov_vector.PointwiseConjugate(); |
74 mat->Multiply(interf_cov_vector_transposed, interf_cov_vector); | 86 mat->Multiply(interf_cov_vector_transposed, interf_cov_vector); |
75 } | 87 } |
76 | 88 |
77 void CovarianceMatrixGenerator::PhaseAlignmentMasks( | 89 void CovarianceMatrixGenerator::PhaseAlignmentMasks( |
78 size_t frequency_bin, | 90 size_t frequency_bin, |
79 size_t fft_size, | 91 size_t fft_size, |
80 int sample_rate, | 92 int sample_rate, |
81 float sound_speed, | 93 float sound_speed, |
(...skipping 11 matching lines...) Expand all Loading... |
93 float distance = std::cos(angle) * geometry[c_ix].x() + | 105 float distance = std::cos(angle) * geometry[c_ix].x() + |
94 std::sin(angle) * geometry[c_ix].y(); | 106 std::sin(angle) * geometry[c_ix].y(); |
95 float phase_shift = -2.f * M_PI * distance * freq_in_hertz / sound_speed; | 107 float phase_shift = -2.f * M_PI * distance * freq_in_hertz / sound_speed; |
96 | 108 |
97 // Euler's formula for mat[0][c_ix] = e^(j * phase_shift). | 109 // Euler's formula for mat[0][c_ix] = e^(j * phase_shift). |
98 mat_els[0][c_ix] = complex<float>(cos(phase_shift), sin(phase_shift)); | 110 mat_els[0][c_ix] = complex<float>(cos(phase_shift), sin(phase_shift)); |
99 } | 111 } |
100 } | 112 } |
101 | 113 |
102 } // namespace webrtc | 114 } // namespace webrtc |
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