;* ======================================================================== *;
;* 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. *
* ========================================================================= *
.global _DSP_fir_cplx
* ========================================================================= *
* End of file: dsp_fir_cplx.h62 *
* ------------------------------------------------------------------------- *
* Copyright (c) 2002 Texas Instruments, Incorporated. *
* All Rights Reserved. *
* ========================================================================= *