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CMSIS/DSP/Source/WindowFunctions/arm_hft116d_f64.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_hft116d_f64.c
+ * Description:  Floating-point (f64) 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 "dsp/window_functions.h"
+#include "dsp/fast_math_functions.h"
+#include <math.h>
+
+/**
+  @ingroup groupWindow
+ */
+
+
+
+
+/**
+  @addtogroup WindowFlat
+  @{
+ */
+
+
+/**
+  @ingroup WindowHFT116D
+ */
+
+/**
+  @brief         Hft116d window generating function (f64).
+  @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                   |          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
+ */
+
+
+
+void arm_hft116d_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 =
+    (1.0 -
+     1.9575375 * cos (w) +
+     1.4780705 * cos (2 * w) -
+     0.6367431 * cos (3 * w) +
+     0.1228389 * cos (4 * w) - 0.0066288 * cos (5 * w));
+        
+     pDst[i] = w;
+   }
+}
+
+/**
+  @} end of WindowFlat group
+ */
+