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Diffstat (limited to 'Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft116d_f32.c')
| -rwxr-xr-x | Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft116d_f32.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft116d_f32.c b/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft116d_f32.c new file mode 100755 index 0000000..62469f2 --- /dev/null +++ b/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft116d_f32.c @@ -0,0 +1,114 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_hft116d_f32.c + * Description: Floating-point (f32) Hft116d window + * + * $Date: 14 December 2022 + * $Revision: v1.15.0 + * + * Target Processor: Cortex-M and Cortex-A cores + * -------------------------------------------------------------------- */ + +/* + * Copyright (C) 2010-2022 ARM Limited or its affiliates. All rights reserved. + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the License); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "arm_compiler_specific.h" + + +#include "dsp/window_functions.h" +#include "dsp/fast_math_functions.h" +#include <math.h> + +/** + @ingroup groupWindow + */ + + + + +/** + @addtogroup WindowFlat + @{ + */ + +/** + @defgroup WindowHFT116D Hft116d window function (116.8 dB) + + */ + +/** + @ingroup WindowHFT116D + */ + +/** + @brief Hft116d window generating function (f32). + @param[out] pDst points to the output generated window + @param[in] blockSize number of samples in the window + + @par Parameters of the window + + | Parameter | Value | + | ------------------------------------: | -----------------: | + | Peak sidelobe level | 116.8 dB | + | Normalized equivalent noise bandwidth | 4.2186 bins | + | 3 dB bandwidth | 4.1579 bins | + | Flatness | -0.0028 dB | + | Recommended overlap | 78.2 % | + +Included in CMSIS-DSP with authorization from professor +Gerhard Heinzel. + +@par Original article: +Spectrum and spectral density estimation by the Discrete Fourier +transform (DFT), including a comprehensive list of window +functions and some new +flat-top windows. + +@par Authors: +G. Heinzel, A. Rudiger and R. Schilling, +Max-Planck-Institut fur Gravitationsphysik +(Albert-Einstein-Institut) +Teilinstitut Hannover + */ + + + +ARM_DSP_ATTRIBUTE void arm_hft116d_f32( + float32_t * pDst, + uint32_t blockSize) +{ + float32_t k = 2.0f / ((float32_t) blockSize); + float32_t w; + + for(uint32_t i=0;i<blockSize;i++) + { + w = PI * (i * k); + w = + (1.0f - + 1.9575375f * cosf (w) + + 1.4780705f * cosf (2.f * w) - + 0.6367431f * cosf (3.f * w) + + 0.1228389f * cosf (4.f * w) - 0.0066288f * cosf (5.f * w)); + + pDst[i] = w; + } +} + +/** + @} end of WindowFlat group + */ + |
