| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_mfcc_init_f16.c |
| * Description: MFCC initialization function for the f16 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_f16.h" |
| |
| #if defined(ARM_FLOAT16_SUPPORTED) |
| |
| |
| |
| /** |
| @brief Initialization of the MFCC F16 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_f16( |
| arm_mfcc_instance_f16 * S, |
| uint32_t fftLen, |
| uint32_t nbMelFilters, |
| uint32_t nbDctOutputs, |
| const float16_t *dctCoefs, |
| const uint32_t *filterPos, |
| const uint32_t *filterLengths, |
| const float16_t *filterCoefs, |
| const float16_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_f16(&(S->cfft),fftLen); |
| #else |
| status=arm_rfft_fast_init_f16(&(S->rfft),fftLen); |
| #endif |
| |
| return(status); |
| } |
| |
| #endif /* defined(ARM_FLOAT16_SUPPORTED) */ |
| /** |
| @} end of MFCC group |
| */ |