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+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_nuttall4b_f64.c
+ * Description: Floating-point (f64) Nuttall4b 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
+ @{
+ */
+
+
+/**
+ @ingroup WindowNUTTALL4B
+ */
+
+/**
+ @brief Nuttall4b 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 | 93.3 dB |
+ | Normalized equivalent noise bandwidth | 2.0212 bins |
+ | 3 dB bandwidth | 1.9122 bins |
+ | Flatness | -0.8118 dB |
+ | Recommended overlap | 66.3 % |
+
+ */
+
+
+
+ARM_DSP_ATTRIBUTE void arm_nuttall4b_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 = 0.355768 - 0.487396 * cos (w) +
+ 0.144232 * cos (2 * w) - 0.012604 * cos (3 * w);
+
+ pDst[i] = w;
+ }
+}
+
+/**
+ @} end of WindowNormal group
+ */
+