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Only adapt AGC when the desired signal is present

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Take the 50% quantile of the mask and compare it to certain threshold to determine if the desired signal is present. A hold is applied to avoid fast switching between states.
is_signal_present_ has been plotted and looks as expected. The AGC adaptation sounds promising, specially for the cases when the speaker fades in and out from the beam direction.

R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/28329005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@8078 4adac7df-926f-26a2-2b94-8c16560cd09d
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aluebs@webrtc.org
2015-01-15 18:07:21 +00:00
parent 3e42a8a56a
commit d82f55d2a7
10 changed files with 310 additions and 115 deletions
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webrtc/modules/modules.gyp
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@ -180,6 +180,8 @@
'audio_processing/beamformer/complex_matrix_unittest.cc',
'audio_processing/beamformer/covariance_matrix_generator_unittest.cc',
'audio_processing/beamformer/matrix_unittest.cc',
'audio_processing/beamformer/mock_beamformer.cc',
'audio_processing/beamformer/mock_beamformer.h',
'audio_processing/beamformer/pcm_utils.cc',
'audio_processing/beamformer/pcm_utils.h',
'audio_processing/echo_cancellation_impl_unittest.cc',