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CMSIS/DSP/Source/WindowFunctions/arm_hft196d_f32.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_hft196d_f32.c
+ * Description:  Floating-point (f32) Hft196d 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 "dsp/window_functions.h"
+#include "dsp/fast_math_functions.h"
+#include <math.h>
+/**
+  @ingroup groupWindow
+ */
+
+
+
+
+/**
+  @addtogroup WindowFlat
+  @{
+ */
+
+/**
+  @defgroup WindowHFT196D Hft196d window function (196.2 dB)
+
+ */
+
+/**
+  @ingroup WindowHFT196D
+ */
+
+/**
+  @brief         Hft196d window generating function (f32).
+  @param[out]    pDst       points to the output generated window
+  @param[in]     blockSize  number of samples in the window
+  @return        none
+ 
+  @par Parameters of the window
+  
+  | Parameter                             | Value              |
+  | ------------------------------------: | -----------------: |
+  | Peak sidelobe level                   |          196.2 dB  |
+  | Normalized equivalent noise bandwidth |       5.1134 bins  |
+  | 3 dB bandwidth                        |       5.0308 bins  |
+  | Flatness                              |         0.0013 dB  |
+  | Recommended overlap                   |            82.3 %  |
+
+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
+ */
+
+
+
+void arm_hft196d_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 -
+     1.979280420f * cosf (w) +
+     1.710288951f * cosf (2.f * w) -
+     1.081629853f * cosf (3.f * w) +
+     0.448734314f * cosf (4.f * w) -
+     0.112376628f * cosf (5.f * w) +
+     0.015122992f * cosf (6.f * w) -
+     0.000871252f * cosf (7.f * w) + 0.000011896f * cosf (8.f * w));
+  
+     pDst[i] = w;
+   }
+}
+
+/**
+  @} end of WindowFlat group
+ */
+