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Diffstat (limited to 'Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft169d_f64.c')
| -rwxr-xr-x | Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft169d_f64.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft169d_f64.c b/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft169d_f64.c new file mode 100755 index 0000000..44bbfac --- /dev/null +++ b/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_hft169d_f64.c @@ -0,0 +1,111 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_hft169d_f64.c + * Description: Floating-point (f64) Hft169d 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 + @{ + */ + + +/** + @ingroup WindowHFT169D + */ + +/** + @brief Hft169d window generating function (f64). + @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 | 169.5 dB | + | Normalized equivalent noise bandwidth | 4.8347 bins | + | 3 dB bandwidth | 4.7588 bins | + | Flatness | 0.0017 dB | + | Recommended overlap | 81.2 % | + +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_hft169d_f64( + float64_t * pDst, + uint32_t blockSize) +{ + float64_t k = 2. / ((float64_t) blockSize); + float64_t w; + + for(uint32_t i=0;i<blockSize;i++) + { + w = PI_F64 * (i * k); + w = + (1 - + 1.97441843 * cos (w) + + 1.65409889 * cos (2. * w) - + 0.95788187 * cos (3. * w) + + 0.33673420 * cos (4. * w) - + 0.06364622 * cos (5. * w) + + 0.00521942 * cos (6. * w) - 0.00010599 * cos (7. * w)); + + pDst[i] = w; + } +} + +/** + @} end of WindowFlat group + */ + |
