1 files changed, 0 insertions, 114 deletions
diff --git a/webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc b/webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc
deleted file mode 100644
index d072832..0000000
--- a/webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#define _USE_MATH_DEFINES
-
-#include "webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.h"
-
-#include <cmath>
-
-namespace webrtc {
-namespace {
-
-float BesselJ0(float x) {
-#if WEBRTC_WIN
-  return _j0(x);
-#else
-  return j0(x);
-#endif
-}
-
-// Calculates the Euclidean norm for a row vector.
-float Norm(const ComplexMatrix<float>& x) {
-  RTC_CHECK_EQ(1, x.num_rows());
-  const size_t length = x.num_columns();
-  const complex<float>* elems = x.elements()[0];
-  float result = 0.f;
-  for (size_t i = 0u; i < length; ++i) {
-    result += std::norm(elems[i]);
-  }
-  return std::sqrt(result);
-}
-
-}  // namespace
-
-void CovarianceMatrixGenerator::UniformCovarianceMatrix(
-    float wave_number,
-    const std::vector<Point>& geometry,
-    ComplexMatrix<float>* mat) {
-  RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_rows());
-  RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
-
-  complex<float>* const* mat_els = mat->elements();
-  for (size_t i = 0; i < geometry.size(); ++i) {
-    for (size_t j = 0; j < geometry.size(); ++j) {
-      if (wave_number > 0.f) {
-        mat_els[i][j] =
-            BesselJ0(wave_number * Distance(geometry[i], geometry[j]));
-      } else {
-        mat_els[i][j] = i == j ? 1.f : 0.f;
-      }
-    }
-  }
-}
-
-void CovarianceMatrixGenerator::AngledCovarianceMatrix(
-    float sound_speed,
-    float angle,
-    size_t frequency_bin,
-    size_t fft_size,
-    size_t num_freq_bins,
-    int sample_rate,
-    const std::vector<Point>& geometry,
-    ComplexMatrix<float>* mat) {
-  RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_rows());
-  RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
-
-  ComplexMatrix<float> interf_cov_vector(1, geometry.size());
-  ComplexMatrix<float> interf_cov_vector_transposed(geometry.size(), 1);
-  PhaseAlignmentMasks(frequency_bin,
-                      fft_size,
-                      sample_rate,
-                      sound_speed,
-                      geometry,
-                      angle,
-                      &interf_cov_vector);
-  interf_cov_vector.Scale(1.f / Norm(interf_cov_vector));
-  interf_cov_vector_transposed.Transpose(interf_cov_vector);
-  interf_cov_vector.PointwiseConjugate();
-  mat->Multiply(interf_cov_vector_transposed, interf_cov_vector);
-}
-
-void CovarianceMatrixGenerator::PhaseAlignmentMasks(
-    size_t frequency_bin,
-    size_t fft_size,
-    int sample_rate,
-    float sound_speed,
-    const std::vector<Point>& geometry,
-    float angle,
-    ComplexMatrix<float>* mat) {
-  RTC_CHECK_EQ(1, mat->num_rows());
-  RTC_CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
-
-  float freq_in_hertz =
-      (static_cast<float>(frequency_bin) / fft_size) * sample_rate;
-
-  complex<float>* const* mat_els = mat->elements();
-  for (size_t c_ix = 0; c_ix < geometry.size(); ++c_ix) {
-    float distance = std::cos(angle) * geometry[c_ix].x() +
-                     std::sin(angle) * geometry[c_ix].y();
-    float phase_shift = -2.f * M_PI * distance * freq_in_hertz / sound_speed;
-
-    // Euler's formula for mat[0][c_ix] = e^(j * phase_shift).
-    mat_els[0][c_ix] = complex<float>(cos(phase_shift), sin(phase_shift));
-  }
-}
-
-}  // namespace webrtc