1 /* 2 ** Copyright 2003-2010, VisualOn, Inc. 3 ** 4 ** Licensed under the Apache License, Version 2.0 (the "License"); 5 ** you may not use this file except in compliance with the License. 6 ** You may obtain a copy of the License at 7 ** 8 ** http://www.apache.org/licenses/LICENSE-2.0 9 ** 10 ** Unless required by applicable law or agreed to in writing, software 11 ** distributed under the License is distributed on an "AS IS" BASIS, 12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 ** See the License for the specific language governing permissions and 14 ** limitations under the License. 15 */ 16 17 /*********************************************************************** 18 * File: pit_shrp.c * 19 * * 20 * Description: Performs Pitch sharpening routine * 21 * * 22 ************************************************************************/ 23 24 #include "typedef.h" 25 #include "basic_op.h" 26 27 void Pit_shrp( 28 Word16 * x, /* in/out: impulse response (or algebraic code) */ 29 Word16 pit_lag, /* input : pitch lag */ 30 Word16 sharp, /* input : pitch sharpening factor (Q15) */ 31 Word16 L_subfr /* input : subframe size */ 32 ) 33 { 34 Word32 i; 35 Word32 L_tmp; 36 Word16 *x_ptr = x + pit_lag; 37 38 for (i = pit_lag; i < L_subfr; i++) 39 { 40 L_tmp = (*x_ptr << 15); 41 L_tmp += *x++ * sharp; 42 *x_ptr++ = ((L_tmp + 0x4000)>>15); 43 } 44 45 return; 46 } 47 48 49 50
