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NE10_fft_common_varibles.h
/*
* Copyright 2014-15 ARM Limited and Contributors.
* All rights reserved.
*
* 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 ARM LIMITED 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 ARM LIMITED 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.
*/
/*
* NE10 Library : dsp/NE10_fft_common_varibles.h
*/
#include "NE10_types.h"
#ifndef NE10_FFT_COMMON_VARIBLES_H
#define NE10_FFT_COMMON_VARIBLES_H
// common varibles
/* Twiddles used in Radix-8 FFT */
static const ne10_float32_t TW_81_F32 = 0.70710678; // sqrt (2) / 2
static const ne10_float32_t TW_81N_F32 = -0.70710678; // - TW_81_F32
/* Twiddles used in Radix-5 FFT */
static const ne10_fft_cpx_float32_t TW_5A_F32 =
{
0.309016994374947, // cos (2 * pi / 5)
-0.951056516295154 // - sin (2 * pi / 5)
};
static const ne10_fft_cpx_int32_t TW_5A_S32 =
{
663608942, // round (TW_5A_F32.r * 2^31)
-2042378317 // round (TW_5A_F32.i * 2^31)
};
static const ne10_fft_cpx_float32_t TW_5B_F32 =
{
-0.809016994374947, // cos (4 * pi / 5)
-0.587785252292473 // - sin (4 * pi / 5)
};
static const ne10_fft_cpx_int32_t TW_5B_S32 =
{
-1737350766, // round (TW_5B_F32.r * 2^31)
-1262259218 // round (TW_5B_F32.i * 2^31)
};
/* Twiddles used in Radix-3 FFT */
static const ne10_float32_t TW_3I_F32 = 0.866025403784439; // sqrt (3) / 2
static const ne10_float32_t TW_3IN_F32 = - 0.866025403784439; // - TW_3IN_F32
static const ne10_int32_t TW_3I_S32 = 1859775393; // round (TW_3I_F32 * 2^31)
static const ne10_int32_t TW_3IN_S32 = -1859775393; // round (TW_3IN_F32 * 2^31)
#endif // NE10_FFT_COMMON_VARIBLES_H
ne10_fft_cpx_float32_t
Definition NE10_types.h:231
ne10_fft_cpx_int32_t
structure for the 32 bits fixed point FFT function.
Definition NE10_types.h:329