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6670a9d145
Comfort noise was generated by picking random angles on the unit circle
for each frequency band and then obtaining points on the unit circle from
{cos(a), -sin(a)}.
In order to reduce complexity, this change introduces a randomly indexed
table of 32 elements over sin(a). cos(a) is obtained by adding an offset
corresponding to pi/2 to the index. The table is pre-scaled by sqrt(2) to
avoid later multiplications.
This change reduces the computational complexity of AEC3 by ~8% with no
audible degradation.
Bug: webrtc:10189
Change-Id: I8cfe2469022fb1fe910ab3f966e55d9d499b7161
Reviewed-on: https://webrtc-review.googlesource.com/c/116787
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Reviewed-by: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26209}
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| .. | ||
| audio_coding | ||
| audio_device | ||
| audio_mixer | ||
| audio_processing | ||
| bitrate_controller | ||
| congestion_controller | ||
| desktop_capture | ||
| include | ||
| pacing | ||
| remote_bitrate_estimator | ||
| rtp_rtcp | ||
| third_party | ||
| utility | ||
| video_capture | ||
| video_coding | ||
| video_processing | ||
| BUILD.gn | ||
| module_common_types_unittest.cc | ||
| OWNERS | ||