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CMSIS/DSP/Source/WindowFunctions/arm_nuttall3a_f64.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_nuttall3a_f64.c
+ * Description:  Floating-point (f64) Nuttall3a 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 WindowNormal
+  @{
+ */
+
+
+/**
+  @ingroup WindowNUTTALL3A
+ */
+
+/**
+  @brief         Nuttall3a 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                   |           64.2 dB  |
+  | Normalized equivalent noise bandwidth |       1.7721 bins  |
+  | 3 dB bandwidth                        |       1.6828 bins  |
+  | Flatness                              |        -1.0453 dB  |
+  | Recommended overlap                   |            61.2 %  |
+
+ */
+
+
+
+void arm_nuttall3a_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 = 0.40897 - 0.5 * cos (w) + 0.09103 * cos (2 * w);
+        
+     pDst[i] = w;
+   }
+}
+
+/**
+  @} end of WindowNormal group
+ */
+