Transparency increasing tuning for AEC3

webrtc/modules/audio_processing/aec3/aec_state_unittest.cc

Index: webrtc/modules/audio_processing/aec3/aec_state_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/aec_state_unittest.cc b/webrtc/modules/audio_processing/aec3/aec_state_unittest.cc
index a3aa4c1d56efdce9a1a838f6aae1901acda18df1..90b7cb92695007582e04db32ae7ac3ba9af2be1e 100644
--- a/webrtc/modules/audio_processing/aec3/aec_state_unittest.cc
+++ b/webrtc/modules/audio_processing/aec3/aec_state_unittest.cc
@@ -114,9 +114,13 @@ TEST(AecState, NormalUsage) {
   {
     const auto& erle = state.Erle();
     EXPECT_EQ(erle[0], erle[1]);
-    for (size_t k = 1; k < erle.size() - 1; ++k) {
+    constexpr size_t kLowFrequencyLimit = 32;
+    for (size_t k = 1; k < kLowFrequencyLimit; ++k) {
       EXPECT_NEAR(k % 2 == 0 ? 8.f : 1.f, erle[k], 0.1);
     }
+    for (size_t k = kLowFrequencyLimit; k < erle.size() - 1; ++k) {
+      EXPECT_NEAR(k % 2 == 0 ? 1.5f : 1.f, erle[k], 0.1);
+    }
     EXPECT_EQ(erle[erle.size() - 2], erle[erle.size() - 1]);
   }
 
@@ -131,9 +135,13 @@ TEST(AecState, NormalUsage) {
   {
     const auto& erle = state.Erle();
     EXPECT_EQ(erle[0], erle[1]);
-    for (size_t k = 1; k < erle.size() - 1; ++k) {
+    constexpr size_t kLowFrequencyLimit = 32;
+    for (size_t k = 1; k < kLowFrequencyLimit; ++k) {
       EXPECT_NEAR(k % 2 == 0 ? 5.f : 1.f, erle[k], 0.1);
     }
+    for (size_t k = kLowFrequencyLimit; k < erle.size() - 1; ++k) {
+      EXPECT_NEAR(k % 2 == 0 ? 1.5f : 1.f, erle[k], 0.1);
+    }
     EXPECT_EQ(erle[erle.size() - 2], erle[erle.size() - 1]);
   }
 }