1 /* ----------------------------------------------------------------------
9  * Target Processor: Cortex-M and Cortex-A cores
10  * -------------------------------------------------------------------- */
12  * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
14  * SPDX-License-Identifier: Apache-2.0
20  * www.apache.org/licenses/LICENSE-2.0
51   @param[in]    S       points to the mfcc instance structure
69   const arm_mfcc_instance_f32 * S,  in arm_mfcc_f32()  argument
79   const float32_t *coefs=S->filterCoefs;  in arm_mfcc_f32()
83   arm_absmax_f32(pSrc,S->fftLen,&maxValue,&index);  in arm_mfcc_f32()
87      arm_scale_f32(pSrc,1.0f/maxValue,pSrc,S->fftLen);  in arm_mfcc_f32()
91   arm_mult_f32(pSrc,S->windowCoefs,pSrc,S->fftLen);  in arm_mfcc_f32()
96   /* some HW accelerator for CMSIS-DSP used in some boards  in arm_mfcc_f32()
104   for(i=0; i < S->fftLen ; i++)  in arm_mfcc_f32()
109   arm_cfft_f32(&(S->cfft),pTmp,0,1);  in arm_mfcc_f32()
112   arm_rfft_fast_f32(&(S->rfft),pSrc,pTmp,0);  in arm_mfcc_f32()
114   pTmp[S->fftLen]=pTmp[1];  in arm_mfcc_f32()
115   pTmp[S->fftLen+1]=0.0f;  in arm_mfcc_f32()
118   arm_cmplx_mag_f32(pTmp,pSrc,S->fftLen);  in arm_mfcc_f32()
121      arm_scale_f32(pSrc,maxValue,pSrc,S->fftLen);  in arm_mfcc_f32()
125   for(i=0; i<S->nbMelFilters; i++)  in arm_mfcc_f32()
127       arm_dot_prod_f32(pSrc+S->filterPos[i],  in arm_mfcc_f32()
129         S->filterLengths[i],  in arm_mfcc_f32()
132       coefs += S->filterLengths[i];  in arm_mfcc_f32()
139   arm_offset_f32(pTmp,1.0e-6f,pTmp,S->nbMelFilters);  in arm_mfcc_f32()
140   arm_vlog_f32(pTmp,pTmp,S->nbMelFilters);  in arm_mfcc_f32()
144   pDctMat.numRows=S->nbDctOutputs;  in arm_mfcc_f32()
145   pDctMat.numCols=S->nbMelFilters;  in arm_mfcc_f32()
146   pDctMat.pData=(float32_t*)S->dctCoefs;  in arm_mfcc_f32()