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: lag_wind.c * 19 * * 20 * Description: Lag_windows on autocorrelations * 21 * r[i] *= lag_wind[i] * 22 * * 23 ************************************************************************/ 24 25 #include "typedef.h" 26 #include "basic_op.h" 27 #include "oper_32b.h" 28 #include "lag_wind.tab" 29 30 31 void Lag_window( 32 Word16 r_h[], /* (i/o) : Autocorrelations (msb) */ 33 Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */ 34 ) 35 { 36 Word32 i; 37 Word32 x; 38 39 for (i = 1; i <= M; i++) 40 { 41 x = Mpy_32(r_h[i], r_l[i], volag_h[i - 1], volag_l[i - 1]); 42 r_h[i] = x >> 16; 43 r_l[i] = (x & 0xffff)>>1; 44 } 45 return; 46 } 47 48 49 50
