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37 lines
1.9 KiB
37 lines
1.9 KiB
/*
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preProcessing.h
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Copyright (C) 2011 Belledonne Communications, Grenoble, France
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Author : Johan Pascal
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef PREPROCESSING_H
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#define PREPROCESSING_H
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/* internal variable initialisations */
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void initPreProcessing(bcg729EncoderChannelContextStruct *encoderChannelContext);
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/*****************************************************************************/
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/* preProcessing : 2nd order highpass filter with cut off frequency at 140Hz */
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/* Algorithm: */
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/* y[i] = BO*x[i] + B1*x[i-1] + B2*x[i-2] + A1*y[i-1] + A2*y[i-2] */
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/* parameters : */
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/* -(i/o) encoderChannelContext : the channel context data */
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/* -(i) signal : 80 values in Q0 */
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/* -(o) preProcessedSignal : 80 values in Q0 */
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/* */
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/*****************************************************************************/
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void preProcessing(bcg729EncoderChannelContextStruct *encoderChannelContext, word16_t signal[], word16_t preProcessedSignal[]);
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#endif /* ifndef PREPROCESSING_H */
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