增加所有文件

2025-11-07 10:05:24 +08:00
parent e248b10f07
commit 7dc1e89694
8376 changed files with 2995205 additions and 42 deletions
--- a/CMSIS/DSP/Source/WindowFunctions/arm_nuttall4_f32.c
+++ b/CMSIS/DSP/Source/WindowFunctions/arm_nuttall4_f32.c
@@ -0,0 +1,93 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_nuttall4_f32.c
+ * Description:  Floating-point (f32) Nuttall4 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
+  @{
+ */
+
+/**
+  @defgroup WindowNUTTALL4 Nuttall4 window function (60.9 dB)
+
+ */
+
+/**
+  @ingroup WindowNUTTALL4
+ */
+
+/**
+  @brief         Nuttall4 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                   |           60.9 dB  |
+  | Normalized equivalent noise bandwidth |         2.31 bins  |
+  | 3 dB bandwidth                        |       2.1884 bins  |
+  | Flatness                              |        -0.6184 dB  |
+  | Recommended overlap                   |            70.5 %  |
+
+ */
+
+
+
+void arm_nuttall4_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 =
+    0.3125f - 0.46875f * cosf (w) + 0.1875f * cosf (2.f * w) -
+    0.03125f * cosf (3.f * w);
+     pDst[i] = w;
+   }
+}
+
+/**
+  @} end of WindowNormal group
+ */
+