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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_mfcc_init_f16.c
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* Description: MFCC initialization function for the f16 version
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*
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* $Date: 07 September 2021
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* $Revision: V1.10.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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@ingroup groupTransforms
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*/
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/**
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@addtogroup MFCC
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@{
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*/
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#include "dsp/transform_functions_f16.h"
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#if defined(ARM_FLOAT16_SUPPORTED)
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/**
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@brief Initialization of the MFCC F16 instance structure
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@param[out] S points to the mfcc instance structure
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@param[in] fftLen fft length
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@param[in] nbMelFilters number of Mel filters
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@param[in] nbDctOutputs number of Dct outputs
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@param[in] dctCoefs points to an array of DCT coefficients
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@param[in] filterPos points of the array of filter positions
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@param[in] filterLengths points to the array of filter lengths
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@param[in] filterCoefs points to the array of filter coefficients
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@param[in] windowCoefs points to the array of window coefficients
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@return error status
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@par Description
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The matrix of Mel filter coefficients is sparse.
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Most of the coefficients are zero.
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To avoid multiplying the spectrogram by those zeros, the
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filter is applied only to a given position in the spectrogram
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and on a given number of FFT bins (the filter length).
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It is the reason for the arrays filterPos and filterLengths.
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window coefficients can describe (for instance) a Hamming window.
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The array has the same size as the FFT length.
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The folder Scripts is containing a Python script which can be used
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to generate the filter, dct and window arrays.
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*/
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arm_status arm_mfcc_init_f16(
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arm_mfcc_instance_f16 * S,
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uint32_t fftLen,
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uint32_t nbMelFilters,
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uint32_t nbDctOutputs,
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const float16_t *dctCoefs,
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const uint32_t *filterPos,
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const uint32_t *filterLengths,
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const float16_t *filterCoefs,
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const float16_t *windowCoefs
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)
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{
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arm_status status;
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S->fftLen=fftLen;
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S->nbMelFilters=nbMelFilters;
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S->nbDctOutputs=nbDctOutputs;
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S->dctCoefs=dctCoefs;
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S->filterPos=filterPos;
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S->filterLengths=filterLengths;
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S->filterCoefs=filterCoefs;
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S->windowCoefs=windowCoefs;
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#if defined(ARM_MFCC_CFFT_BASED)
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status=arm_cfft_init_f16(&(S->cfft),fftLen);
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#else
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status=arm_rfft_fast_init_f16(&(S->rfft),fftLen);
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#endif
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return(status);
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}
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#endif /* defined(ARM_FLOAT16_SUPPORTED) */
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/**
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@} end of MFCC group
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*/
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