44 lines
1.2 KiB
Python
Executable File
44 lines
1.2 KiB
Python
Executable File
import cmsisdsp as dsp
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import numpy as np
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import cmsisdsp.fixedpoint as f
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import cmsisdsp.mfcc as mfcc
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import scipy.signal as sig
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from mfccdebugdata import *
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from cmsisdsp.datatype import Q15
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import cmsisdsp.datatype as dt
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mfccq15=dsp.arm_mfcc_instance_q15()
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sample_rate = 16000
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FFTSize = 256
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numOfDctOutputs = 13
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freq_min = 64
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freq_high = sample_rate / 2
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numOfMelFilters = 20
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windowQ15 = dt.convert(sig.windows.hamming(FFTSize, sym=False),Q15)
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filtLen,filtPos,packedFiltersQ15 = mfcc.melFilterMatrix(Q15,freq_min, freq_high, numOfMelFilters,sample_rate,FFTSize)
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dctMatrixFiltersQ15 = mfcc.dctMatrix(Q15,numOfDctOutputs, numOfMelFilters)
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status=dsp.arm_mfcc_init_q15(mfccq15,FFTSize,numOfMelFilters,numOfDctOutputs,
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dctMatrixFiltersQ15,
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filtPos,filtLen,packedFiltersQ15,windowQ15)
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print("Init status = %d" % status)
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tmp=np.zeros(2*FFTSize,dtype=np.int32)
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debugQ15 = f.toQ15(debug)
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errorStatus,resQ15=dsp.arm_mfcc_q15(mfccq15,debugQ15,tmp)
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print("MFCC status = %d" % errorStatus)
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res=(1<<8)*f.Q15toF32(resQ15)
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print(res)
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print(ref)
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print("FFT Length = %d" % mfccq15.fftLen())
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print("Nb MEL Filters = %d" % mfccq15.nbMelFilters())
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print("Nb DCT Outputs = %d" % mfccq15.nbDctOutputs())
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