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/*
** Copyright 2003-2010, VisualOn, Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
/***********************************************************************
* File: pit_shrp.c *
* *
* Description: Performs Pitch sharpening routine *
* *
************************************************************************/
#include "typedef.h"
#include "basic_op.h"
void Pit_shrp(
Word16 * x, /* in/out: impulse response (or algebraic code) */
Word16 pit_lag, /* input : pitch lag */
Word16 sharp, /* input : pitch sharpening factor (Q15) */
Word16 L_subfr /* input : subframe size */
)
{
Word32 i;
Word32 L_tmp;
Word16 *x_ptr = x + pit_lag;
for (i = pit_lag; i < L_subfr; i++)
{
L_tmp = (*x_ptr << 15);
L_tmp += *x++ * sharp;
*x_ptr++ = ((L_tmp + 0x4000)>>15);
}
return;
}
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