/* ----------------------------------------------------------------------
- Copyright (C) 2010-2014 ARM Limited. All rights reserved.
- $Date: 19. March 2015
- $Revision: V.1.4.5
- Project: CMSIS DSP Library
- Title: arm_rfft_init_f32.c
- Description: RFFT & RIFFT Floating point initialisation function
- Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- Redistributions of source code must retain the above copyright
-
notice, this list of conditions and the following disclaimer. -
- Redistributions in binary form must reproduce the above copyright
-
notice, this list of conditions and the following disclaimer in -
the documentation and/or other materials provided with the -
distribution. -
- Neither the name of ARM LIMITED nor the names of its contributors
-
may be used to endorse or promote products derived from this -
software without specific prior written permission. - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
- -------------------------------------------------------------------- */
include "arm_math.h"
/**
- @ingroup groupTransforms
*/
/**
- @addtogroup RealFFT
- @{
*/
/**
- \par
- Generation of realCoefA array:
- \par
- n = 4096
-
for (i = 0; i < n; i++)
- {
- pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
- pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
- }
*/
static const float32_t realCoefA[8192] = {
0.500000000000000f, -0.500000000000000f, 0.499616503715515f,
-0.499999850988388f,
0.499233007431030f, -0.499999403953552f, 0.498849511146545f,
-0.499998688697815f,
0.498466014862061f, -0.499997645616531f, 0.498082518577576f,
-0.499996334314346f,
0.497699022293091f, -0.499994695186615f, 0.497315555810928f,
-0.499992787837982f,
0.496932059526443f, -0.499990582466125f, 0.496548563241959f,
-0.499988079071045f,
0.496165096759796f, -0.499985307455063f, 0.495781600475311f,
-0.499982208013535f,
0.495398133993149f, -0.499978810548782f, 0.495014637708664f,
-0.499975144863129f,
0.494631171226501f, -0.499971181154251f, 0.494247704744339