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Tweak kDecayRate in the IntelligibilityEnhancer

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This makes the addaptation of the IntelligibilityEnhancer slower, which makes it take more time to kick in or when the background noise changes drastically. But on the other hand, it reduces the risk of clipping and makes the changing in coloring less noticeable.

R=henrik.lundin@webrtc.org, peah@webrtc.org, turaj@webrtc.org

Review URL: https://codereview.webrtc.org/1848123002 .

Cr-Commit-Position: refs/heads/master@{#12202}
This commit is contained in:
Alejandro Luebs
2016-04-01 13:59:38 -07:00
parent 3b14996046
commit 2d66cf9d8d
1 changed files with 2 additions and 2 deletions
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4
webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc
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@ -34,8 +34,8 @@ const float kLambdaTop = -1e-5f; // search for lamda.
const float kVoiceProbabilityThreshold = 0.02f;
// Number of chunks after voice activity which is still considered speech.
const size_t kSpeechOffsetDelay = 80;
const float kDecayRate = 0.98f; // Power estimation decay rate.
const float kMaxRelativeGainChange = 0.04f; // Maximum relative change in gain.
const float kDecayRate = 0.994f; // Power estimation decay rate.
const float kMaxRelativeGainChange = 0.006f;
const float kRho = 0.0004f; // Default production and interpretation SNR.
const float kPowerNormalizationFactor = 1.f / (1 << 30);