blob: e0747fb7e59c5ba21cdc46deb89c2fc6c63a31c8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* This header file includes the description of the internal VAD call
* WebRtcVad_GaussianProbability.
*/
#ifndef WEBRTC_VAD_GMM_H_
#define WEBRTC_VAD_GMM_H_
#include "typedefs.h"
/****************************************************************************
* WebRtcVad_GaussianProbability(...)
*
* This function calculates the probability for the value 'in_sample', given that in_sample
* comes from a normal distribution with mean 'mean' and standard deviation 'std'.
*
* Input:
* - in_sample : Input sample in Q4
* - mean : mean value in the statistical model, Q7
* - std : standard deviation, Q7
*
* Output:
*
* - delta : Value used when updating the model, Q11
*
* Return:
* - out : out = 1/std * exp(-(x-m)^2/(2*std^2));
* Probability for x.
*
*/
WebRtc_Word32 WebRtcVad_GaussianProbability(WebRtc_Word16 in_sample,
WebRtc_Word16 mean,
WebRtc_Word16 std,
WebRtc_Word16 *delta);
#endif // WEBRTC_VAD_GMM_H_
|
