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