htk.h

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 /*                Centre for Speech Technology Research                 */
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 /*                                                                       */
 /*                 Author: Richard Caley (rjc@cstr.ed.ac.uk)             */
 /*                   Date: Mon Nov  3 1997                               */
 /* --------------------------------------------------------------------  */
 /* Defines for HTK format.                                               */
 /*                                                                       */
 /*************************************************************************/



#ifndef __HTK_H__
#define __HTK_H__

#define HTK_ENERGY   0x0040
#define HTK_NO_E     0x0080
#define HTK_DELTA    0x0100
#define HTK_AC       0x0200
#define HTK_COMP     0x0400
#define HTK_ZM       0x0800
#define HTK_CRC      0x1000
#define HTK_0CEP     0x2000
#define HTK_EST_PS   0x4000 // This is a local one and may become illegal
#define HTK_MASK     0x003f

#define HTK_WAVE     0x0000
#define HTK_LPC      0x0001
#define HTK_LPCREFC  0x0002
#define HTK_LPCCEP   0x0003
#define HTK_LPDELCEP 0x0004
#define HTK_IREFC    0x0005
#define HTK_MFCC     0x0006
#define HTK_FBANK    0x0007
#define HTK_MELSPEC  0x0008
#define HTK_USER     0x0009
#define HTK_DISCRETE 0x000A


/* 100ns = 10 per us = 10 000 per ms = 10 000 000 per second*/
#define HTK_UNITS_PER_SECOND 10000000

struct htk_header 
{
    int num_samps; 
    int samp_period;   /* in 100ns units -design choice of the century*/
    /* I don't think this is right -- awb, is this an old HTK format ? */
    short samp_size;    /* number of bytes per sample */
    short samp_type;    /* code from 0 to 10 indicating sample kind */
                        /* - see HTK reference manual, or #defs above */
};


#endif