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Diffstat (limited to 'Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_nuttall3b_f32.c')
| -rwxr-xr-x | Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_nuttall3b_f32.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_nuttall3b_f32.c b/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_nuttall3b_f32.c new file mode 100755 index 0000000..08c0964 --- /dev/null +++ b/Middlewares/Third_Party/ARM/ARM.CMSIS-DSP.1.17.1/Source/WindowFunctions/arm_nuttall3b_f32.c @@ -0,0 +1,95 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_nuttall3b_f32.c + * Description: Floating-point (f32) Nuttall3b 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 WindowNormal + @{ + */ + +/** + @defgroup WindowNUTTALL3B Nuttall3b window function (71.5 dB) + + */ + +/** + @ingroup WindowNUTTALL3B + */ + +/** + @brief Nuttall3b 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 | 71.5 dB | + | Normalized equivalent noise bandwidth | 1.7037 bins | + | 3 dB bandwidth | 1.6162 bins | + | Flatness | -1.1352 dB | + | Recommended overlap | 59.8 % | + + */ + + + +ARM_DSP_ATTRIBUTE void arm_nuttall3b_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 = 0.4243801f - 0.4973406f * cosf (w) + 0.0782793f * cosf (2.f * w); + + pDst[i] = w; + } +} + +/** + @} end of WindowNormal group + */ + |
