/* ======================================================================== */
/* TEXAS INSTRUMENTS, INC. */
/* */
/* DSPLIB DSP Signal Processing Library */
/* */
/* Release: Version 1.02 */
/* CVS Revision: 1.4 Thu Apr 18 00:44:13 2002 (UTC) */
/* Snapshot date: 18-Apr-2002 */
/* */
/* This library contains proprietary intellectual property of Texas */
/* Instruments, Inc. The library and its source code are protected by */
/* various copyrights, and portions may also be protected by patents or */
/* other legal protections. */
/* */
/* This software is licensed for use with Texas Instruments TMS320 */
/* family DSPs. This license was provided to you prior to installing */
/* the software. You may review this license by consulting the file */
/* TI_license.PDF which accompanies the files in this library. */
/* ------------------------------------------------------------------------ */
/* Copyright (C) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
/* ======================================================================== */
/* TEXAS INSTRUMENTS, INC. */
/* */
/* NAME */
/* DSP_fir_r8 */
/* */
/* REVISION DATE */
/* 25-Feb-2002 */
/* */
/* USAGE */
/* This routine is C-callable and can be called as: */
/* */
/* void DSP_fir_r8 */
/* ( */
/* const short *restrict x, */
/* const short *restrict h, */
/* short *restrict r, */
/* int nh, */
/* int nr */
/* ); */
/* */
/* x[nr+nh-1]: Input samples. */
/* Must be word-aligned. */
/* h[nh] : Filter coefficients. Must be in reverse order. */
/* Must be word-aligned. */
/* r[nr] : Output samples. */
/* nh : Number of filter coefficients. */
/* Must be multiple of 8 and >= 8. */
/* nr : Number of output samples. */
/* Must be multiple of 2. */
/* */
/* DESCRIPTION */
/* Computes a real FIR filter (direct-form) using coefficients stored */
/* in vector h. The real data input is stored in vector x. The */
/* filter output is stored in vector r. The filter computes nr output */
/* samples and nh coefficients. It operates on 16-bit data with a */
/* 32-bit accumulate. */
/* */
/* C CODE */
/* void DSP_fir_r8 */
/* ( */
/* const short *restrict x, */
/* const short *restrict h, */
/* short *restrict r, */
/* int nh, */
/* int nr */
/* ); */
/* { */
/* int i, j, sum; */
/* */
/* for (j = 0; j < nr; j++) */
/* { */
/* sum = 0; */
/* for (i = 0; i < nh; i++) */
/* sum += x[i + j] * h[i]; */
/* r[j] = sum >> 15; */
/* } */
/* } */
/* */
/* */
/* ASSUMPTIONS */
/* nh must be a multiple of 8 and >= 8. */
/* nr must be a multiple of 2 and >= 2. */
/* x[] and h[] must be word-aligned. */
/* */
/* MEMORY NOTE */
/* No memory bank hits under any conditions. */
/* This code is LIITLE ENDIAN. */
/* */
/* TECHNIQUES */
/* The assembly routine performs 2 output samples at a time. */
/* The inner loop is unrolled eight times. The outer loop is unrolled */
/* twice. Both the inner and outer loops are software pipelined. */
/* */
/* CYCLES */
/* nh * nr/2 + 28 */
/* */
/* CODESIZE */
/* 544 bytes */
/* */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
#ifndef DSP_FIR_R8_H_
#define DSP_FIR_R8_H_ 1
void DSP_fir_r8
(
const short *restrict x,
const short *restrict h,
short *restrict r,
int nh,
int nr
);
#endif
/* ======================================================================== */
/* End of file: dsp_fir_r8.h */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */