magic number question

[xiaoyaoxiaoxian]

features[NB_BANDS+2NB_DELTA_CEPS] -= 1.3; features[NB_BANDS+2NB_DELTA_CEPS+1] -= 0.9; features[NB_BANDS+3NB_DELTA_CEPS] = .01(pitch_index-300);

features[0] -= 12; features[1] -= 4;

I donnot know why 1.3 0.9 12 and 4 is subtracted in feature excact funciton. Could any one answer me?

[Zadagu]

These are simplified standardization measures.

[xiaoyaoxiaoxian]

thanks