/* ======================================================================== */
/* TEXAS INSTRUMENTS, INC. */
/* */
/* DSPLIB DSP Signal Processing Library */
/* */
/* Release: Version 1.02 */
/* CVS Revision: 1.6 Wed Apr 17 15:48:16 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_cplx */
/* */
/* REVISION DATE */
/* 09-Apr-2002 */
/* */
/* USAGE */
/* This routine is C-callable and can be called as: */
/* */
/* void DSP_fir_cplx */
/* ( */
/* const short *restrict x, */
/* const short *restrict h, */
/* short *restrict r, */
/* int nh, */
/* int nr */
/* ) */
/* */
/* x[2*(nr+nh-1)] : Input array. x must point to x[2*(nh-1)]. */
/* h[2*nh] : Coefficient array (in normal order). */
/* r[2*nr] : Output array. */
/* nh : Number of complex coefficients. */
/* Must be even. */
/* nr : Number of complex output samples. */
/* nh * nr must be >= 4. */
/* */
/* DESCRIPTION */
/* This complex FIR computes nr complex output samples using nh */
/* complex coefficients. It operates on 16-bit data with a 32-bit */
/* accumulate. Each array consists of an even and odd term with even */
/* terms representing the real part of the element and the odd terms */
/* the imaginary part. The pointer to input array x must point to the */
/* (nh)th complex sample, i.e. element 2*(nh-1), upon entry to the */
/* function. The coefficients are expected in normal order. */
/* */
/* C CODE */
/* void DSP_fir_cplx */
/* ( */
/* const short *restrict x, */
/* const short *restrict h, */
/* short *restrict r, */
/* int nh, */
/* int nr */
/* ) */
/* { */
/* short i,j; */
/* int imag, real; */
/* */
/* for (i = 0; i < 2*nr; i += 2) */
/* { */
/* imag = 0; */
/* real = 0; */
/* for (j = 0; j < 2*nh; j += 2) */
/* { */
/* real += h[j] * x[i-j] - h[j+1] * x[i+1-j]; */
/* imag += h[j] * x[i+1-j] + h[j+1] * x[i-j]; */
/* } */
/* r[i] = (real >> 15); */
/* r[i+1] = (imag >> 15); */
/* } */
/* } */
/* */
/* TECHNIQUES */
/* The inner loop is unrolled twice. */
/* The outer loop is conditionally executed in parallel with the */
/* inner loop. */
/* Both the inner and outer loops are software pipelined. */
/* */
/* ASSUMPTIONS */
/* nh must be even. */
/* nr * nh >=4. */
/* */
/* MEMORY NOTE */
/* No memory bank hits under any conditions. */
/* */
/* NOTE */
/* Little Endian */
/* */
/* CYCLES */
/* 2* nh * nr + 20 */
/* */
/* CODESIZE */
/* 384 bytes */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */
#ifndef DSP_FIR_CPLX_H_
#define DSP_FIR_CPLX_H_ 1
void DSP_fir_cplx
(
const short *restrict x,
const short *restrict h,
short *restrict r,
int nh,
int nr
);
#endif
/* ======================================================================== */
/* End of file: dsp_fir_cplx.h */
/* ------------------------------------------------------------------------ */
/* Copyright (c) 2002 Texas Instruments, Incorporated. */
/* All Rights Reserved. */
/* ======================================================================== */