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Making the delay estimator more robust to noisy nearends and low echoes

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This CL reduces the delay estimator step size to make it react better in
scenarios where the environment is noisy, or the echo level is fairly
low.

Bug: webrtc:9177,chromium:835281
Change-Id: I482d898c91eddc497e1284ee500d26df21a0574a
Reviewed-on: https://webrtc-review.googlesource.com/71486
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22990}
This commit is contained in:
Per Åhgren
2018-04-20 15:35:15 +02:00
committed by Commit Bot
parent e987f2b765
commit b04e5cae08
1 changed files with 6 additions and 6 deletions
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12
modules/audio_processing/aec3/matched_filter.cc
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@ -100,10 +100,10 @@ void MatchedFilterCore_NEON(size_t x_start_index,
// Update the matched filter estimate in an NLMS manner.
if (x2_sum > x2_sum_threshold && !saturation) {
RTC_DCHECK_LT(0.f, x2_sum);
const float alpha = 0.7f * e / x2_sum;
const float alpha = 0.1f * e / x2_sum;
const float32x4_t alpha_128 = vmovq_n_f32(alpha);
// filter = filter + 0.7 * (y - filter * x) / x * x.
// filter = filter + 0.1 * (y - filter * x) / x * x.
float* h_p = &h[0];
x_p = &x[x_start_index];
@ -215,10 +215,10 @@ void MatchedFilterCore_SSE2(size_t x_start_index,
// Update the matched filter estimate in an NLMS manner.
if (x2_sum > x2_sum_threshold && !saturation) {
RTC_DCHECK_LT(0.f, x2_sum);
const float alpha = 0.7f * e / x2_sum;
const float alpha = 0.1f * e / x2_sum;
const __m128 alpha_128 = _mm_set1_ps(alpha);
// filter = filter + 0.7 * (y - filter * x) / x * x.
// filter = filter + 0.1 * (y - filter * x) / x * x.
float* h_p = &h[0];
x_p = &x[x_start_index];
@ -286,9 +286,9 @@ void MatchedFilterCore(size_t x_start_index,
// Update the matched filter estimate in an NLMS manner.
if (x2_sum > x2_sum_threshold && !saturation) {
RTC_DCHECK_LT(0.f, x2_sum);
const float alpha = 0.7f * e / x2_sum;
const float alpha = 0.1f * e / x2_sum;
// filter = filter + 0.7 * (y - filter * x) / x * x.
// filter = filter + 0.1 * (y - filter * x) / x * x.
size_t x_index = x_start_index;
for (size_t k = 0; k < h.size(); ++k) {
h[k] += alpha * x[x_index];