61 lines
1.8 KiB
C
61 lines
1.8 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.
|
|
*/
|
|
|
|
|
|
/*
|
|
* This header file includes the VAD internal calls for Downsampling and FindMinimum.
|
|
* Specific function calls are given below.
|
|
*/
|
|
|
|
#ifndef WEBRTC_VAD_SP_H_
|
|
#define WEBRTC_VAD_SP_H_
|
|
|
|
#include "vad_core.h"
|
|
|
|
/****************************************************************************
|
|
* WebRtcVad_Downsampling(...)
|
|
*
|
|
* Downsamples the signal a factor 2, eg. 32->16 or 16->8
|
|
*
|
|
* Input:
|
|
* - signal_in : Input signal
|
|
* - in_length : Length of input signal in samples
|
|
*
|
|
* Input & Output:
|
|
* - filter_state : Filter state for first all-pass filters
|
|
*
|
|
* Output:
|
|
* - signal_out : Downsampled signal (of length len/2)
|
|
*/
|
|
void WebRtcVad_Downsampling(WebRtc_Word16* signal_in,
|
|
WebRtc_Word16* signal_out,
|
|
WebRtc_Word32* filter_state,
|
|
int in_length);
|
|
|
|
/****************************************************************************
|
|
* WebRtcVad_FindMinimum(...)
|
|
*
|
|
* Find the five lowest values of x in 100 frames long window. Return a mean
|
|
* value of these five values.
|
|
*
|
|
* Input:
|
|
* - feature_value : Feature value
|
|
* - channel : Channel number
|
|
*
|
|
* Input & Output:
|
|
* - inst : State information
|
|
*
|
|
* Output:
|
|
* return value : Weighted minimum value for a moving window.
|
|
*/
|
|
WebRtc_Word16 WebRtcVad_FindMinimum(VadInstT* inst, WebRtc_Word16 feature_value, int channel);
|
|
|
|
#endif // WEBRTC_VAD_SP_H_
|