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+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_hft95_f64.c
+ * Description: Floating-point (f64) Hft95 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 WindowFlat
+ @{
+ */
+
+
+/**
+ @ingroup WindowHFT95
+ */
+
+/**
+ @brief Hft95 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 | 95.0 dB |
+ | Normalized equivalent noise bandwidth | 3.8112 bins |
+ | 3 dB bandwidth | 3.7590 bins |
+ | Flatness | 0.0044 dB |
+ | Recommended overlap | 75.6 % |
+
+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
+ */
+
+
+
+ARM_DSP_ATTRIBUTE void arm_hft95_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 -
+ 1.9383379 * cos (w) +
+ 1.3045202 * cos (2 * w) -
+ 0.4028270 * cos (3 * w) + 0.0350665 * cos (4 * w));
+
+
+ pDst[i] = w;
+ }
+}
+
+/**
+ @} end of WindowFlat group
+ */
+