[ep-processor-libraries/dsplib.git] / ti / dsplib / src / DSPF_sp_autocor / c674 / DSPF_sp_autocor_cn.c
1 /* ======================================================================= */
2 /* DSP_autocor_cn.c -- Autocorrelation */
3 /* Natural C Implementation */
4 /* */
5 /* Rev 0.0.2 */
6 /* */
7 /* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ */
8 /* */
9 /* */
10 /* Redistribution and use in source and binary forms, with or without */
11 /* modification, are permitted provided that the following conditions */
12 /* are met: */
13 /* */
14 /* Redistributions of source code must retain the above copyright */
15 /* notice, this list of conditions and the following disclaimer. */
16 /* */
17 /* Redistributions in binary form must reproduce the above copyright */
18 /* notice, this list of conditions and the following disclaimer in the */
19 /* documentation and/or other materials provided with the */
20 /* distribution. */
21 /* */
22 /* Neither the name of Texas Instruments Incorporated nor the names of */
23 /* its contributors may be used to endorse or promote products derived */
24 /* from this software without specific prior written permission. */
25 /* */
26 /* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
27 /* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
28 /* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */
29 /* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
30 /* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
31 /* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
32 /* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
33 /* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY */
34 /* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
35 /* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */
36 /* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
37 /* */
38 /* ======================================================================= */
40 #pragma CODE_SECTION(DSPF_sp_autocor_cn, ".text:ansi");
42 #include "DSPF_sp_autocor_cn.h"
44 void DSPF_sp_autocor_cn(float *r, const float *x, const int nx, const int nr)
45 {
46 int i,k;
47 float sum;
48 for (i = 0; i < nr; i++)
49 {
50 sum = 0;
51 for (k = nr; k < nx+nr; k++)
52 sum += x[k] * x[k-i];
53 r[i] = sum ;
54 }
55 }
57 /* ======================================================================= */
58 /* End of file: DSPF_sp_autocor_cn.c */
59 /* ----------------------------------------------------------------------- */
60 /* Copyright (c) 2011 Texas Instruments, Incorporated. */
61 /* All Rights Reserved. */
62 /* ======================================================================= */