mirror of
https://github.com/ShaYmez/MMDVM_CM.git
synced 2024-11-15 20:51:49 -05:00
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
|
/*---------------------------------------------------------------------------*\
|
||
|
|
|
||
|
|
FILE........: lpc.h
|
||
|
|
AUTHOR......: David Rowe
|
||
|
|
DATE CREATED: 24/8/09
|
||
|
|
|
||
|
|
Linear Prediction functions written in C.
|
||
|
|
|
||
|
|
\*---------------------------------------------------------------------------*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
Copyright (C) 2009-2012 David Rowe
|
||
|
|
|
||
|
|
All rights reserved.
|
||
|
|
|
||
|
|
This program is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Lesser General Public License version 2.1, as
|
||
|
|
published by the Free Software Foundation. This program is
|
||
|
|
distributed in the hope that it will be useful, but WITHOUT ANY
|
||
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
|
||
|
|
License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
|
along with this program; if not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __LPC__
|
||
|
|
#define __LPC__
|
||
|
|
|
||
|
|
#define LPC_MAX_ORDER 20
|
||
|
|
|
||
|
|
class Clpc {
|
||
|
|
public:
|
||
|
|
void autocorrelate(float Sn[], float Rn[], int Nsam, int order);
|
||
|
|
void levinson_durbin(float R[], float lpcs[], int order);
|
||
|
|
private:
|
||
|
|
void pre_emp(float Sn_pre[], float Sn[], float *mem, int Nsam);
|
||
|
|
void de_emp(float Sn_se[], float Sn[], float *mem, int Nsam);
|
||
|
|
void hanning_window(float Sn[], float Wn[], int Nsam);
|
||
|
|
void inverse_filter(float Sn[], float a[], int Nsam, float res[], int order);
|
||
|
|
void synthesis_filter(float res[], float a[], int Nsam, int order, float Sn_[]);
|
||
|
|
void find_aks(float Sn[], float a[], int Nsam, int order, float *E);
|
||
|
|
void weight(float ak[], float gamma, int order, float akw[]);
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|