/* * ENDPOINT.H - endpoint class definition * * Bruce T. Lowerre, Public domain, 1995, 1997 * * $Log: endpoint.h,v $ * Revision 1.2  1997/05/23 19:59:01  lowerre * renamed class endpoint to endpointer, conflicts with <rpcsvc/nis.h> * * Revision 1.1  1997/05/14 20:34:34  lowerre * Initial revision * * *//* * The endpointer is used to determine the start and end of a live input signal. * Unlike a pre-recorded utterance, a live input signal is open-ended in that the * actual start and end of the signal is totally unknown.  The search, using * HMM techniques with a silence model, will usually do a fairly good job of * guessing the start of the signal.  However, the actual end of the signal is * unknown to the recognizer.  Reaching the end state in the recognizer does not * necessarily mean the end of signal.  Therefore, the end of signal must be * calculated by some means.  This is the job of the end point detector. */#ifndef ENDPOINT_H#define ENDPOINT_H#include "general.h"				// contains general defstypedef enum{    NOSILENCE,    INSILENCE,    START,    INSIGNAL,    END} EPSTATE;typedef enum{    EP_NONE,    EP_RESET,    EP_SILENCE,    EP_SIGNAL,    EP_INUTT,    EP_MAYBEEND,    EP_ENDOFUTT,    EP_NOTEND,    EP_NOSTARTSILENCE} EPTAG;class endpointer{    private:        EPSTATE		epstate;        float		ave,			noise,			begthresh,			energy,			maxpeak,			endthresh,			begfact,			endfact,			energyfact,			mnbe,			peakreturn,		// average energy			dpnoise,			triggerfact,		// schmidt trigger percent			minstartsilence,			*lastdpnoise;		// array of size numdpnoise        long		samprate,		// sampling rate in Hz			windowsize,		// window size in samples			stepsize,		// step size in samples        		scnt,			avescnt,			vcnt,			evcnt,			voicecount,			minfriclng,			bscnt,			zccnt,			startframe,			endframe,			ncount,			zcthresh,			numdpnoise,			minrise,			maxpause,			maxipause,			startblip,			endblip,			minuttlng,			minvoicelng,			zc;			// zero cross count per window        BOOLEAN		startsilenceok,			low;			// is signal currently low or high?        void zcpeakpick				// get zc count and average energy        (            short*				// raw samples        );        void setnoise ();			// initial noise level set        void averagenoise ();			// average noise array and shift    public:        endpointer				// constructor        (            long,				// sampling rate in Hz            long,				// window  size in samples            long,				// step size in samples            long = 700,				// endof utt silence default, msec            long = 100,				// minuttlng default, msec            long = 600,				// zcthresh default, Hz            float = 40.0,			// begfact default            float = 80.0,			// endfact default            float = 200.0,			// energyfact default            float = 2000.0,			// minstartsilence default            float = 3.0,			// triggerfact default            long = 6,				// numdpnoise default            long = 50,				// minfriclng default, msec            long = 150,				// maxpause default, msec            long = 30,				// startblip default, msec            long = 20,				// endblip default, msec            long = 60,				// minvoicelng default, msec            long = 50				// minrise default, msec        );        ~endpointer ();				// destructor        void initendpoint ();			// initialize variables        EPTAG getendpoint        (            short*				// raw samples of window size        );        const char *gettagname			// convert tag to ascii        (            EPTAG        );        void printvars ();			// print variables        long getzc () {return (zc);}		// get the zero cross count        float getenergy () {return (peakreturn);}	// get the RMS energy}; // end class endpointer#endif