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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
/*
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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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// Gaussian probability calculations internally used in vad_core.c.
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#ifndef COMMON_AUDIO_VAD_VAD_GMM_H_
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#define COMMON_AUDIO_VAD_VAD_GMM_H_
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#include <stdint.h>
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// Calculates the probability for `input`, given that `input` comes from a
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// normal distribution with mean and standard deviation (`mean`, `std`).
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//
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// Inputs:
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// - input : input sample in Q4.
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// - mean : mean input 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 : input used when updating the model, Q11.
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// `delta` = (`input` - `mean`) / `std`^2.
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//
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// Return:
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// (probability for `input`) =
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// 1 / `std` * exp(-(`input` - `mean`)^2 / (2 * `std`^2));
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int32_t WebRtcVad_GaussianProbability(int16_t input,
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int16_t mean,
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int16_t std,
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int16_t* delta);
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#endif // COMMON_AUDIO_VAD_VAD_GMM_H_
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