39 |
* |
* |
40 |
*******************************************************************/ |
*******************************************************************/ |
41 |
#include "mfcc.hh" |
#include "mfcc.hh" |
42 |
|
#include "fft.hh" |
43 |
|
|
44 |
mfcc::mfcc ( ContSignal signal ){ |
mfcc::mfcc ( ContSignal signal ){ |
45 |
} |
} |
46 |
|
|
47 |
mfcc::mfcc ( DiscSignal signal ) |
static int my_rint(double x) |
48 |
{ |
{ |
49 |
|
if ( 2*x == (double)rint(2*x)) |
50 |
|
x+=0.0001; |
51 |
|
|
52 |
|
return((int)rint(x)); |
53 |
|
} |
54 |
|
|
55 |
|
mfcc::mfcc ( DiscSignal &signal ) |
56 |
|
{ |
57 |
|
//param: taille init, taille windowing |
58 |
|
|
59 |
|
double |
60 |
|
lowestFrequency = 133.3333, |
61 |
|
linearFilters = 13, |
62 |
|
linearSpacing = 66.66666666, |
63 |
|
logFilters = 27, |
64 |
|
logSpacing = 1.0711703, |
65 |
|
fftSize = 512, |
66 |
|
cepstralCoefficients = 13, |
67 |
|
windowSize = 256, |
68 |
|
samplingRate = 1025, |
69 |
|
totalFilters, |
70 |
|
*mfccFilterWeights, |
71 |
|
*freqs, |
72 |
|
*triangleHeight, |
73 |
|
*lower, |
74 |
|
*upper, |
75 |
|
*center, |
76 |
|
*fftFreqs, |
77 |
|
*hamWindow, |
78 |
|
*mfccDCTMatrix, |
79 |
|
*preEmphasized, |
80 |
|
first, |
81 |
|
last, |
82 |
|
*fftData, |
83 |
|
*empreinte, |
84 |
|
maxi, |
85 |
|
*earMag, *ceps, loga, windowStep, cols, frameRate = |
86 |
|
100; |
87 |
|
|
88 |
|
int i, j, k; |
89 |
|
|
90 |
|
preEmphasized = (double *)calloc(1024, sizeof(double)); |
91 |
|
totalFilters = linearFilters + logFilters; |
92 |
|
freqs = (double *)calloc(sizeof(double), (int)totalFilters + 2); |
93 |
|
for (i = 0; i < linearFilters; i++) |
94 |
|
freqs[i] = lowestFrequency + i * linearSpacing; |
95 |
|
for (i = (int)linearFilters; i < (int)totalFilters + 2; i++) |
96 |
|
freqs[i] = |
97 |
|
freqs[(int) linearFilters - 1] * pow(logSpacing,i - linearFilters + 1); |
98 |
|
lower = (double*)calloc((int)totalFilters, sizeof(double)); |
99 |
|
upper = (double*)calloc((int)totalFilters, sizeof(double)); |
100 |
|
center = (double*)calloc((int)totalFilters, sizeof(double)); |
101 |
|
triangleHeight = (double*)calloc((int)totalFilters, sizeof(double)); |
102 |
|
fftData = (double*)calloc(sizeof(double), (int)fftSize); |
103 |
|
|
104 |
|
for (i = 0; i < (int)totalFilters; i++) |
105 |
|
lower[i] = freqs[i]; |
106 |
|
for (i = 1; i < (int)totalFilters + 1; i++) |
107 |
|
center[i - 1] = freqs[i]; |
108 |
|
for (i = 2; i < (int)totalFilters + 2; i++) |
109 |
|
upper[i - 2] = freqs[i]; |
110 |
|
|
111 |
|
hamWindow = (double*)calloc((int)windowSize, sizeof(double)); |
112 |
|
mfccFilterWeights = (double *)calloc((int)(totalFilters * fftSize), sizeof(double)); |
113 |
|
for (i = 0; i < totalFilters; i++) |
114 |
|
triangleHeight[i] = 2 / (upper[i] - lower[i]); |
115 |
|
fftFreqs = (double *)calloc((int)fftSize, sizeof(double)); |
116 |
|
for (i = 0; i < fftSize; i++) |
117 |
|
fftFreqs[i] = (i / fftSize) * samplingRate; |
118 |
|
for (i = 0; i < totalFilters; i++) |
119 |
|
for (j = 0; j < (int)fftSize; j++) { |
120 |
|
mfccFilterWeights[(int) fftSize * i + j] = |
121 |
|
((fftFreqs[j] > lower[i]) && (fftFreqs[j] <= center[i])) |
122 |
|
* triangleHeight[i] * (fftFreqs[j] - lower[i]) / (center[i] - lower[i]) + |
123 |
|
((fftFreqs[j] > center[i]) && (fftFreqs[j] <upper[i])) * triangleHeight[i] * (upper[i] - fftFreqs[j]) / |
124 |
|
(upper[i] - center[i]); |
125 |
|
} |
126 |
|
// for (i=0;i<40*512;i++) printf("%d %d %f\n",i/512,i%512,mfccFilterWeights[i]); |
127 |
|
for (i = 0; i < windowSize; i++) |
128 |
|
hamWindow[i] = 0.54 - 0.46 * cos(2 * PI * i / windowSize); |
129 |
|
mfccDCTMatrix = (double*) |
130 |
|
calloc(sizeof(double), (int)(cepstralCoefficients * totalFilters)); |
131 |
|
for (i = 0; i < cepstralCoefficients; i++) |
132 |
|
for (j = 0; j < totalFilters; j++) |
133 |
|
mfccDCTMatrix[j * (int) cepstralCoefficients + i] = |
134 |
|
1 / sqrt(totalFilters / 2) * cos(i * (2 * j + 1) * PI / 2 / totalFilters); |
135 |
|
// for (j=0;j<13*40;j++) printf("%d %d %f \n",j/13,j%13,mfccDCTMatrix[j]); |
136 |
|
for (i = 0; i < totalFilters; i++) |
137 |
|
mfccDCTMatrix[i * (int) cepstralCoefficients] *= 1 / sqrt(2); |
138 |
|
for (i = 1; i < 1024; i++) |
139 |
|
preEmphasized[i] = signal[i] + signal[i - 1] * -0.97; |
140 |
|
preEmphasized[0] = signal[0]; |
141 |
|
//for (i=0;i<1024;i++) printf("%d %f \n",i,preEmphasized[i]); |
142 |
|
earMag = (double*)malloc(sizeof(double) * (int)totalFilters); |
143 |
|
windowStep = samplingRate / frameRate; |
144 |
|
cols = (int) ((1024 - windowSize) / windowStep); |
145 |
|
//printf("%d",(int)cols); |
146 |
|
ceps = (double*)malloc((int)(sizeof(double) * cols * linearFilters)); |
147 |
|
for (i = 0; i < cols; i++) { |
148 |
|
first = i * windowStep + 1; |
149 |
|
last = first + windowSize - 1; |
150 |
|
for (j = 0; j < fftSize; j++) |
151 |
|
fftData[j] = 0; |
152 |
|
for (j = 0; j < windowSize; j++) |
153 |
|
fftData[j] = |
154 |
|
preEmphasized[(int) my_rint(first + j - 1)] * |
155 |
|
hamWindow[j]; |
156 |
|
//for (j=0; j<512;j++) printf("%d %f\n",j,fftData[j]); |
157 |
|
/* for (j = 0; j < fftSize; j++) { |
158 |
|
inR[j] = fftData[j]; |
159 |
|
inI[j] = 0; |
160 |
|
} |
161 |
|
fft_double(512, 0, inR, inI, ouR, ouI); |
162 |
|
for (j = 0; j < fftSize; j++) |
163 |
|
fftMag[j] = sqrt(ouR[j] * ouR[j] + ouI[j] * ouI[j]); |
164 |
|
//for (j=0; j<512;j++) printf("%d %f\n",j,fftMag[j]); |
165 |
|
*/ |
166 |
|
DiscSignal fftMag = (new fft(*new DiscSignal(fftData, (int)fftSize), true))->get_magnitude(); |
167 |
|
for (j = 0; j < totalFilters; j++) { |
168 |
|
loga = 0; |
169 |
|
for (k = 0; k < fftSize; k++) |
170 |
|
loga += |
171 |
|
fftMag[k] * mfccFilterWeights[k + j * (int) fftSize]; |
172 |
|
earMag[j] = log10(loga); |
173 |
|
} |
174 |
|
// for (j=0;j<40;j++) printf("%d %f\n",j,earMag[j]); |
175 |
|
for (j = 0; j < linearFilters; j++) { |
176 |
|
loga = 0; |
177 |
|
for (k = 0; k < totalFilters; k++) |
178 |
|
loga += |
179 |
|
earMag[k] * mfccDCTMatrix[j + k * (int) linearFilters]; |
180 |
|
ceps[j + i * (int) linearFilters] = loga; |
181 |
|
} |
182 |
|
} |
183 |
|
//////////////////////moyenne////////////////////// |
184 |
|
empreinte = (double*)malloc(sizeof(double) * 12); |
185 |
|
// for (i=0;i<68;i++) |
186 |
|
// printf("%d %d %f\n",i/13,i%13,ceps[i]); |
187 |
|
// for (i =0; i<13;i++) for(j=0;j<6;j++) printf("%d %d %f\n",j,i,ceps[i + j*13]); |
188 |
|
for (i = 1; i < 13; i++) |
189 |
|
empreinte[i - 1] = (ceps[i] + ceps[i + 13] + ceps[i+26] + ceps[i+39] + ceps[i+52] + ceps[i+65]); |
190 |
|
|
191 |
|
maxi=0; |
192 |
|
for (i=0;i<12;i++) if (maxi*maxi<empreinte[i]*empreinte[i]) maxi=empreinte[i]; |
193 |
|
for (i=0;i<12;i++) empreinte[i]=(empreinte[i]/fabs(maxi))*2; |
194 |
|
(new DiscSignal(empreinte, 13))->perl_capture(); |
195 |
|
//for (i=0;i<12;i++) printf("%d %lf\n",i,empreinte[i]); |
196 |
|
free(mfccFilterWeights); |
197 |
|
free(triangleHeight); |
198 |
|
free(lower); |
199 |
|
free(upper); |
200 |
|
free(center); |
201 |
|
free(fftFreqs); |
202 |
|
free(hamWindow); |
203 |
|
free(mfccDCTMatrix); |
204 |
|
free(preEmphasized); |
205 |
|
free(fftData); |
206 |
|
|
207 |
|
free(earMag); |
208 |
|
free(ceps); |
209 |
|
|
210 |
|
|
211 |
|
|
212 |
|
// return (empreinte); |
213 |
|
|
214 |
|
|
215 |
} |
} |