mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-18 14:07:30 +00:00
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
// Gaussian probability calculations internally used in vad_core.c.
|
|
|
|
#ifndef WEBRTC_COMMON_AUDIO_VAD_VAD_GMM_H_
|
|
#define WEBRTC_COMMON_AUDIO_VAD_VAD_GMM_H_
|
|
|
|
#include "webrtc/typedefs.h"
|
|
|
|
// Calculates the probability for |input|, given that |input| comes from a
|
|
// normal distribution with mean and standard deviation (|mean|, |std|).
|
|
//
|
|
// Inputs:
|
|
// - input : input sample in Q4.
|
|
// - mean : mean input in the statistical model, Q7.
|
|
// - std : standard deviation, Q7.
|
|
//
|
|
// Output:
|
|
//
|
|
// - delta : input used when updating the model, Q11.
|
|
// |delta| = (|input| - |mean|) / |std|^2.
|
|
//
|
|
// Return:
|
|
// (probability for |input|) =
|
|
// 1 / |std| * exp(-(|input| - |mean|)^2 / (2 * |std|^2));
|
|
int32_t WebRtcVad_GaussianProbability(int16_t input,
|
|
int16_t mean,
|
|
int16_t std,
|
|
int16_t* delta);
|
|
|
|
#endif // WEBRTC_COMMON_AUDIO_VAD_VAD_GMM_H_
|