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