增加所有文件

CMSIS/DSP/Source/TransformFunctions/arm_mfcc_init_q31.c

@@ -0,0 +1,107 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_mfcc_init_q31.c
+ * Description:  MFCC initialization function for the q31 version
+ *
+ * $Date:        07 September 2021
+ * $Revision:    V1.10.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 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.
+ */
+
+/**
+  @ingroup groupTransforms
+ */
+
+
+/**
+  @addtogroup MFCC
+  @{
+ */
+
+
+#include "dsp/transform_functions.h"
+
+
+
+/**
+  @brief         Initialization of the MFCC Q31 instance structure
+  @param[out]    S       points to the mfcc instance structure
+  @param[in]     fftLen  fft length
+  @param[in]     nbMelFilters  number of Mel filters
+  @param[in]     nbDctOutputs  number of Dct outputs
+  @param[in]     dctCoefs  points to an array of DCT coefficients
+  @param[in]     filterPos  points of the array of filter positions
+  @param[in]     filterLengths  points to the array of filter lengths
+  @param[in]     filterCoefs  points to the array of filter coefficients
+  @param[in]     windowCoefs  points to the array of window coefficients
+
+  @return        error status
+
+  @par           Description
+                   The matrix of Mel filter coefficients is sparse.
+                   Most of the coefficients are zero.
+                   To avoid multiplying the spectrogram by those zeros, the
+                   filter is applied only to a given position in the spectrogram
+                   and on a given number of FFT bins (the filter length).
+                   It is the reason for the arrays filterPos and filterLengths.
+
+                   window coefficients can describe (for instance) a Hamming window.
+                   The array has the same size as the FFT length.
+
+                   The folder Scripts is containing a Python script which can be used
+                   to generate the filter, dct and window arrays.
+ */
+
+arm_status arm_mfcc_init_q31(
+  arm_mfcc_instance_q31 * S,
+  uint32_t fftLen,
+  uint32_t nbMelFilters,
+  uint32_t nbDctOutputs,
+  const q31_t *dctCoefs,
+  const uint32_t *filterPos,
+  const uint32_t *filterLengths,
+  const q31_t *filterCoefs,
+  const q31_t *windowCoefs
+  )
+{
+ arm_status status;
+
+ S->fftLen=fftLen;
+ S->nbMelFilters=nbMelFilters;
+ S->nbDctOutputs=nbDctOutputs;
+ S->dctCoefs=dctCoefs;
+ S->filterPos=filterPos;
+ S->filterLengths=filterLengths;
+ S->filterCoefs=filterCoefs;
+ S->windowCoefs=windowCoefs;
+
+ #if defined(ARM_MFCC_CFFT_BASED)
+ status=arm_cfft_init_q31(&(S->cfft),fftLen);
+ #else
+ status=arm_rfft_init_q31(&(S->rfft),fftLen,0,1);
+ #endif
+ 
+ return(status);
+}
+
+/**
+  @} end of MFCC group
+ */