/* | |
** 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; | |
} | |