VoxForge
The Julius 3.2 book section 7. Feature parameter files (-input mfcfile) says:
Feature Parameter Types
It is necessary that the feature parameter format matches the original HMM training data feature format. However if all the necessary parameters for the HMM are held within the given feature parameter file,Julius will then automatically extract the appropriate parameters for recognition.For example
If the parameter format below is used for training
MFCC_E_D_N_Z = MFCC(12)+ ?MFCC(12)+ ?Pow(1) (CMN) 25-dimension
Then for recognition you can also use feature parameter files other then MFCC_E_D_N_Z, such as
MFCC_E_D_Z = MFCC(12)+Pow(1)+?MFCC(12)+ ?Pow(1)
(CMN) 26-dimension
or
MFCC_E_D_A_Z = MFCC(12)+Pow(1)+ ?MFCC(12)+ ?Pow(1)
+ ??MFCC(12) + ??Pow(1) (CMN) 39-dimension
The parameter file needs to contain all of the parameters used for the original training of the HMM model,
extra data contained with in the file will not be used.
where (from the HTK book):
_E has energy
_N absolute energy suppressed
_D has delta coe?cients
_A has acceleration coe?cients
_C is compressed
_Z has zero mean static coef.
_K has CRC checksum
_O has 0’th cepstral coef