mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-12 21:30:45 +01:00
96315752d2
Bug: webrtc:12338 Change-Id: I884db28e6d9a87d343be7c2616571a8bee28252c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226944 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34568}
39 lines
1.4 KiB
C
39 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 COMMON_AUDIO_VAD_VAD_GMM_H_
|
|
#define COMMON_AUDIO_VAD_VAD_GMM_H_
|
|
|
|
#include <stdint.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 // COMMON_AUDIO_VAD_VAD_GMM_H_
|