48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* This header file includes the description of the internal VAD call
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* WebRtcVad_GaussianProbability.
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*/
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#ifndef WEBRTC_VAD_GMM_H_
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#define WEBRTC_VAD_GMM_H_
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#include "typedefs.h"
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/****************************************************************************
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* WebRtcVad_GaussianProbability(...)
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*
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* This function calculates the probability for the value 'in_sample', given that in_sample
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* comes from a normal distribution with mean 'mean' and standard deviation 'std'.
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*
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* Input:
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* - in_sample : Input sample in Q4
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* - mean : mean value in the statistical model, Q7
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* - std : standard deviation, Q7
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*
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* Output:
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*
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* - delta : Value used when updating the model, Q11
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*
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* Return:
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* - out : out = 1/std * exp(-(x-m)^2/(2*std^2));
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* Probability for x.
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*
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*/
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WebRtc_Word32 WebRtcVad_GaussianProbability(WebRtc_Word16 in_sample,
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WebRtc_Word16 mean,
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WebRtc_Word16 std,
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WebRtc_Word16 *delta);
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#endif // WEBRTC_VAD_GMM_H_
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