1 /*
2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
3 *
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
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "modules/audio_processing/aec3/erl_estimator.h"
12
13 #include "test/gtest.h"
14
15 namespace webrtc {
16
17 namespace {
18
VerifyErl(const std::array<float,kFftLengthBy2Plus1> & erl,float erl_time_domain,float reference)19 void VerifyErl(const std::array<float, kFftLengthBy2Plus1>& erl,
20 float erl_time_domain,
21 float reference) {
22 std::for_each(erl.begin(), erl.end(),
23 [reference](float a) { EXPECT_NEAR(reference, a, 0.001); });
24 EXPECT_NEAR(reference, erl_time_domain, 0.001);
25 }
26
27 } // namespace
28
29 // Verifies that the correct ERL estimates are achieved.
TEST(ErlEstimator,Estimates)30 TEST(ErlEstimator, Estimates) {
31 std::array<float, kFftLengthBy2Plus1> X2;
32 std::array<float, kFftLengthBy2Plus1> Y2;
33
34 ErlEstimator estimator;
35
36 // Verifies that the ERL estimate is properly reduced to lower values.
37 X2.fill(500 * 1000.f * 1000.f);
38 Y2.fill(10 * X2[0]);
39 for (size_t k = 0; k < 200; ++k) {
40 estimator.Update(X2, Y2);
41 }
42 VerifyErl(estimator.Erl(), estimator.ErlTimeDomain(), 10.f);
43
44 // Verifies that the ERL is not immediately increased when the ERL in the data
45 // increases.
46 Y2.fill(10000 * X2[0]);
47 for (size_t k = 0; k < 998; ++k) {
48 estimator.Update(X2, Y2);
49 }
50 VerifyErl(estimator.Erl(), estimator.ErlTimeDomain(), 10.f);
51
52 // Verifies that the rate of increase is 3 dB.
53 estimator.Update(X2, Y2);
54 VerifyErl(estimator.Erl(), estimator.ErlTimeDomain(), 20.f);
55
56 // Verifies that the maximum ERL is achieved when there are no low RLE
57 // estimates.
58 for (size_t k = 0; k < 1000; ++k) {
59 estimator.Update(X2, Y2);
60 }
61 VerifyErl(estimator.Erl(), estimator.ErlTimeDomain(), 1000.f);
62
63 // Verifies that the ERL estimate is is not updated for low-level signals
64 X2.fill(1000.f * 1000.f);
65 Y2.fill(10 * X2[0]);
66 for (size_t k = 0; k < 200; ++k) {
67 estimator.Update(X2, Y2);
68 }
69 VerifyErl(estimator.Erl(), estimator.ErlTimeDomain(), 1000.f);
70 }
71
72 } // namespace webrtc
73