synths.c File Reference

#include "f2c.h"

Include dependency graph for synths.c:

Go to the source code of this file.

Macros
#define	contrl_1   contrl_

Functions
int	synths_ (integer *voice, integer *pitch, real *rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st)

Variables
static real	c_b2 = .7f
struct {
logical   corrp
integer   lframe
integer   order
}	contrl_

Macro Definition Documentation

contrl_1

#define contrl_1   contrl_

Definition at line 59 of file synths.c.

Referenced by synths_().

Function Documentation

synths_()

int synths_	(	integer *	voice,
		integer *	pitch,
		real *	rms,
		real *	rc,
		real *	speech,
		integer *	k,
		struct lpc10_decoder_state *	st
	)

Definition at line 170 of file synths.c.

References bsynz_(), buf, lpc10_decoder_state::buf, lpc10_decoder_state::buflen, c_b2, contrl_1, deemp_(), irc2pc_(), max, min, and pitsyn_().

Referenced by lpc10_decode().

{
 /* Initialized data */

 real *buf;
 integer *buflen;

 /* System generated locals */
 integer i__1;
 real r__1, r__2;

 /* Local variables */
 real rmsi[16];
 integer nout, ivuv[16], i__, j;
 extern /* Subroutine */ int deemp_(real *, integer *, struct lpc10_decoder_state *);
 real ratio;
 integer ipiti[16];
 real g2pass;
 real pc[10];
 extern /* Subroutine */ int pitsyn_(integer *, integer *, integer *, real
 *, real *, integer *, integer *, integer *, real *, real *,
 integer *, real *, struct lpc10_decoder_state *);
 real rci[160] /* was [10][16] */;

/* $Log$
 * Revision 1.16 2004/06/26 03:50:14 markster
 * Merge source cleanups (bug #1911)
 *
 * Revision 1.15 2003/09/27 02:45:37 markster
 * Fix various compiler warnings (bug #322)
 *
 * Revision 1.2 2003/09/27 02:45:37 markster
 * Fix various compiler warnings (bug #322)
 *
 * Revision 1.1.1.1 2003/02/12 13:59:15 matteo
 * mer feb 12 14:56:57 CET 2003
 *
 * Revision 1.2 2000/01/05 08:20:39 markster
 * Some OSS fixes and a few lpc changes to make it actually work
 *
 * Revision 1.2 1996/08/20 20:42:59 jaf
 * Removed all static local variables that were SAVE'd in the Fortran
 * code, and put them in struct lpc10_decoder_state that is passed as an
 * argument.
 *
 * Removed init function, since all initialization is now done in
 * init_lpc10_decoder_state().
 *
 * Revision 1.1 1996/08/19 22:30:33 jaf
 * Initial revision
 * */
/* Revision 1.3 1996/03/29 22:03:47 jaf */
/* Removed definitions for any constants that were no longer used. */

/* Revision 1.2 1996/03/26 19:34:33 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */

/* Revision 1.1 1996/02/07 14:43:51 jaf */
/* Initial revision */

/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Arguments */
/* $Log$
 * Revision 1.16 2004/06/26 03:50:14 markster
 * Merge source cleanups (bug #1911)
 *
 * Revision 1.15 2003/09/27 02:45:37 markster
 * Fix various compiler warnings (bug #322)
 *
 * Revision 1.2 2003/09/27 02:45:37 markster
 * Fix various compiler warnings (bug #322)
 *
 * Revision 1.1.1.1 2003/02/12 13:59:15 matteo
 * mer feb 12 14:56:57 CET 2003
 *
 * Revision 1.2 2000/01/05 08:20:39 markster
 * Some OSS fixes and a few lpc changes to make it actually work
 *
 * Revision 1.2 1996/08/20 20:42:59 jaf
 * Removed all static local variables that were SAVE'd in the Fortran
 * code, and put them in struct lpc10_decoder_state that is passed as an
 * argument.
 *
 * Removed init function, since all initialization is now done in
 * init_lpc10_decoder_state().
 *
 * Revision 1.1 1996/08/19 22:30:33 jaf
 * Initial revision
 * */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */

/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */

/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */

/* LPC Processing control variables: */

/* *** Read-only: initialized in setup */

/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */

/* Here are the only files which use these variables: */

/* lpcsim.f setup.f trans.f error.f vqsetup.f */

/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* integer quant, nbits */
/* *** Read/write: variables for debugging, not needed for LPC algorithm
*/

/* Current frame, Unstable frames, Output clip count, Max onset buffer,
*/
/* Debug listing detail level, Line count on listing page */

/* nframe is not needed for an embedded LPC10 at all. */
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
/* an application, I would recommend removing the call to ERROR in RCCHK,
*/
/* and remove ERROR and nunsfm completely. */
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
*/
/* sread.f. When LPC10 is embedded into an application, one might want */
/* to cause it to be incremented in a routine that takes the output of */
/* SYNTHS and sends it to an audio device. It could be optionally */
/* displayed, for those that might want to know what it is. */
/* maxosp is never initialized to 0 in SETUP, although it probably should
*/
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
/* would be of much interest to an application in which LPC10 is */
/* embedded. */
/* listl and lincnt are not needed for an embedded LPC10 at all. */
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* common /contrl/ quant, nbits */
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
/* Parameters/constants */
/* Local variables that need not be saved */
/* Local state */
/* BUF is a buffer of speech samples that would have been returned
*/
/* by the older version of SYNTHS, but the newer version doesn't, */
/* so that the newer version can always return MAXFRM samples on */
/* every call. This has the effect of delaying the return of */
/* samples for one additional frame time. */

/* Indices 1 through BUFLEN contain samples that are left over from
*/
/* the last call to SYNTHS. Given the way that PITSYN works, */
/* BUFLEN should always be in the range MAXFRM-MAXPIT+1 through */
/* MAXFRM, inclusive, after a call to SYNTHS is complete. */

/* On the first call to SYNTHS (or the first call after */
/* reinitializing with the entry INITSYNTHS), BUFLEN is MAXFRM, and
*/
/* a frame of silence is always returned. */
 /* Parameter adjustments */
 if (voice) {
 --voice;
 }
 if (rc) {
 --rc;
 }
 if (speech) {
 --speech;
 }

 /* Function Body */
 buf = &(st->buf[0]);
 buflen = &(st->buflen);

/* Computing MAX */
 i__1 = min(*pitch,156);
 *pitch = max(i__1,20);
 i__1 = contrl_1.order;
 for (i__ = 1; i__ <= i__1; ++i__) {
/* Computing MAX */
/* Computing MIN */
 r__2 = rc[i__];
 r__1 = min(r__2,.99f);
 rc[i__] = max(r__1,-.99f);
 }
 pitsyn_(&contrl_1.order, &voice[1], pitch, rms, &rc[1], &contrl_1.lframe,
 ivuv, ipiti, rmsi, rci, &nout, &ratio, st);
 if (nout > 0) {
 i__1 = nout;
 for (j = 1; j <= i__1; ++j) {

/* Add synthesized speech for pitch period J to the en
d of */
/* BUF. */

 irc2pc_(&rci[j * 10 - 10], pc, &contrl_1.order, &c_b2, &g2pass);
 bsynz_(pc, &ipiti[j - 1], &ivuv[j - 1], &buf[*buflen], &rmsi[j - 1]
 , &ratio, &g2pass, st);
 deemp_(&buf[*buflen], &ipiti[j - 1], st);
 *buflen += ipiti[j - 1];
 }

/* Copy first MAXFRM samples from BUF to output array SPEECH
*/
/* (scaling them), and then remove them from the beginning of
 */
/* BUF. */

 for (i__ = 1; i__ <= 180; ++i__) {
 speech[i__] = buf[i__ - 1] / 4096.f;
 }
 *k = 180;
 *buflen += -180;
 i__1 = *buflen;
 for (i__ = 1; i__ <= i__1; ++i__) {
 buf[i__ - 1] = buf[i__ + 179];
 }
 }
 return 0;
} /* synths_ */

Variable Documentation

c_b2

real c_b2 = .7f

static

Definition at line 63 of file synths.c.

Referenced by synths_().

contrl_

struct { ... } contrl_

corrp

logical corrp

Definition at line 56 of file synths.c.

lframe

integer lframe

Definition at line 55 of file synths.c.

order

integer order

Definition at line 55 of file synths.c.