lpcsim.f,v

这是LPC-10压缩算法的源代码,愿共享之.也希望能赐与MELP方面的算法源码.

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1.3
date	96.03.25.20.07.30;	author jaf;	state Exp;
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1.2
date	96.02.12.15.07.26;	author jaf;	state Exp;
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1.1
date	96.02.07.14.33.03;	author jaf;	state Exp;
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1.3
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@Removed the comments added last time, and added a few different ones.
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@************************************************************************
*
*     NSA LPC-10 Voice Coder
*
*       Unix Version 54
*
*        15 March 1991
*
* $Log: lpcsim.f,v $
* Revision 1.2  1996/02/12 15:07:26  jaf
* Added a few comments.
*
* Revision 1.1  1996/02/07 14:33:03  jaf
* Initial revision
*
*
************************************************************************


	PROGRAM LPCSIM
	INCLUDE 'config.fh'
	INCLUDE 'contrl.fh'

	INTEGER VOICE(2), PITCH
	REAL RMS, RC(MAXORD), SPEECH(MAXFRM+MAXPIT)
	INTEGER LEN, N, SREAD, SWRITE
	LOGICAL EOF
	DATA  EOF /.FALSE./

*   Set processing options, open files

	CALL SETUP()

*   Process until end of file on input

	DO WHILE(.TRUE.)
	   CALL FRAME()

*   Read, Pre-process, and Analyze input speech

*       ... but only if the input file is speech (audio samples).  If
*       the input is 'parameters' or 'bits', then the reading is done in
*       the call to TRANS().

	   IF (FSI .GE. 0) THEN
	      N = SREAD(FSI, SPEECH, LFRAME)
	      IF(N .NE. LFRAME) GOTO 900
	      CALL PREPRO(SPEECH, LFRAME)
	      CALL ANALYS(SPEECH, VOICE, PITCH, RMS, RC)
	   END IF

*   Encode parameters and send over channel

	   CALL TRANS(VOICE, PITCH, RMS, RC, EOF)
	   IF(EOF) GOTO 900

*   Synthesize speech from received parameters

*       ... but only if the output file is speech (audio samples).  If
*       the output is 'parameters' or 'bits', then the writing is done
*       in the call to TRANS().

	   IF (FSO .GE. 0) THEN
	      CALL SYNTHS(VOICE, PITCH, RMS, RC, SPEECH, LEN)
*	      IF (LISTL .GE. 2) THEN
*		 WRITE(FDEBUG,100) NFRAME, LEN
*100		 FORMAT(1X,'NFRAME ',I4,' LENGTH OF DECODED FRAME ',I3)
*	      END IF
	      N = SWRITE(FSO, SPEECH, LEN)
	   END IF
	END DO

*   Finished - wrap it up

900	CALL WRAPUP()
	CALL EXIT(0)
	END
@


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@Added a few comments.
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*       Currently the size of the frames, LFRAME, is set to MAXFRM,
*       which is set to 180.  I wonder what the restrictions might be on
*       other values that this code will work for?

*       Preprocessing (PREPRO) consists of passing the frame through a
*       100 Hz high-pass filter, implemented in the subroutine HP100().
*       I don't know what order filter it is, but the current
*       implementation requires 7 real multiplications and 8 real
*       additions/subtractions per sample.  I don't know enough about
*       writing filters to know if that can be reduced, but Bill would
*       know.  Perhaps the filter could even be removed or modified.


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1.1
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@Initial revision
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