#include "f2c.h"

Include dependency graph for bsynz.c:

Macros
#define	contrl_1 contrl_

Functions
int	bsynz_ (real coef, integer ip, integer iv, real sout, real rms, real ratio, real g2pass, struct lpc10_decoder_state st)

Variables
struct {
logical corrp

integer lframe

integer order

}	contrl_

Macro Definition Documentation

◆ contrl_1

#define contrl_1 contrl_

Definition at line 50 of file bsynz.c.

Referenced by bsynz_().

Function Documentation

◆ bsynz_()

int bsynz_	(	real *	coef,
		integer *	ip,
		integer *	iv,
		real *	sout,
		real *	rms,
		real *	ratio,
		real *	g2pass,
		struct lpc10_decoder_state *	st
	)

Definition at line 122 of file bsynz.c.

References contrl_1, lpc10_decoder_state::exc, lpc10_decoder_state::exc2, lpc10_decoder_state::hpi1, lpc10_decoder_state::hpi2, lpc10_decoder_state::hpi3, lpc10_decoder_state::ipo, lpc10_decoder_state::lpi1, lpc10_decoder_state::lpi2, lpc10_decoder_state::lpi3, min, random_(), and lpc10_decoder_state::rmso_bsynz.

Referenced by synths_().

 {
  /* Initialized data */
 
  integer *ipo;
  real *rmso;
  static integer kexc[25] = { 8,-16,26,-48,86,-162,294,-502,718,-728,184,
  672,-610,-672,184,728,718,502,294,162,86,48,26,16,8 };
  real *exc;
  real *exc2;
  real *lpi1;
  real *lpi2;
  real *lpi3;
  real *hpi1;
  real *hpi2;
  real *hpi3;
 
  /* System generated locals */
  integer i__1, i__2;
  real r__1, r__2;
 
  /* Builtin functions */
  double sqrt(doublereal);
 
  /* Local variables */
  real gain, xssq;
  integer i__, j, k;
  real noise[166], pulse;
  integer px;
  real sscale;
  extern integer random_(struct lpc10_decoder_state *);
  real xy, sum, ssq;
  real lpi0, hpi0;
 
 /* $Log$
  * Revision 1.15 2004/06/26 03:50:14 markster
  * Merge source cleanups (bug #1911)
  *
  * Revision 1.14 2003/02/12 13:59:14 matteo
  * mer feb 12 14:56:57 CET 2003
  *
  * Revision 1.1.1.1 2003/02/12 13:59:14 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 20:18:55 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 22:32:58 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 1.15 2004/06/26 03:50:14 markster
  * Merge source cleanups (bug #1911)
  *
  * Revision 1.14 2003/02/12 13:59:14 matteo
  * mer feb 12 14:56:57 CET 2003
  *
  * Revision 1.1.1.1 2003/02/12 13:59:14 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 20:18:55 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 22:32:58 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 */
 /* Function return value definitions */
 /* Parameters/constants */
 /* KEXC is not a Fortran PARAMETER, but it is an array initialized
 */
 /* with a DATA statement that is never modified. */
 /* Local variables that need not be saved */
 /* NOISE is declared with range (1:MAXPIT+MAXORD), but only indices
 */
 /* ORDER+1 through ORDER+IP are ever used, and I think that IP */
 /* .LE. MAXPIT. Why not declare it to be in the range (1:MAXPIT) */
 /* and use that range? */
 /* Local state */
 /* I believe that only indices 1 through ORDER of EXC need to be */
 /* saved from one invocation to the next, but we may as well save */
 /* the whole array. */
 /* None of these local variables were given initial values in the */
 /* original code. I'm guessing that 0 is a reasonable initial */
 /* value for all of them. */
  /* Parameter adjustments */
  if (coef) {
  --coef;
  }
  if (sout) {
  --sout;
  }
 
  /* Function Body */
  ipo = &(st->ipo);
  exc = &(st->exc[0]);
  exc2 = &(st->exc2[0]);
  lpi1 = &(st->lpi1);
  lpi2 = &(st->lpi2);
  lpi3 = &(st->lpi3);
  hpi1 = &(st->hpi1);
  hpi2 = &(st->hpi2);
  hpi3 = &(st->hpi3);
  rmso = &(st->rmso_bsynz);
 
 /* MAXPIT+MAXORD=166 */
 /* Calculate history scale factor XY and scale filter state */
 /* Computing MIN */
  r__1 = *rmso / (*rms + 1e-6f);
  xy = min(r__1,8.f);
  *rmso = *rms;
  i__1 = contrl_1.order;
  for (i__ = 1; i__ <= i__1; ++i__) {
  exc2[i__ - 1] = exc2[*ipo + i__ - 1] * xy;
  }
  *ipo = *ip;
  if (*iv == 0) {
 /* Generate white noise for unvoiced */
  i__1 = *ip;
  for (i__ = 1; i__ <= i__1; ++i__) {
  exc[contrl_1.order + i__ - 1] = (real) (random_(st) / 64);
  }
 /* Impulse doublet excitation for plosives */
 /* (RANDOM()+32768) is in the range 0 to 2**16-1. Therefore the
  */
 /* following expression should be evaluated using integers with
 at */
 /* least 32 bits (16 isn't enough), and PX should be in the rang
 e */
 /* ORDER+1+0 through ORDER+1+(IP-2) .EQ. ORDER+IP-1. */
  px = (random_(st) + 32768) * (*ip - 1) / 65536 + contrl_1.order + 1;
  r__1 = *ratio / 4 * 1.f;
  pulse = r__1 * 342;
  if (pulse > 2e3f) {
  pulse = 2e3f;
  }
  exc[px - 1] += pulse;
  exc[px] -= pulse;
 /* Load voiced excitation */
  } else {
  sscale = (real)sqrt((real) (*ip)) / 6.928f;
  i__1 = *ip;
  for (i__ = 1; i__ <= i__1; ++i__) {
  exc[contrl_1.order + i__ - 1] = 0.f;
  if (i__ <= 25) {
  exc[contrl_1.order + i__ - 1] = sscale * kexc[i__ - 1];
  }
  lpi0 = exc[contrl_1.order + i__ - 1];
  r__2 = exc[contrl_1.order + i__ - 1] * .125f + *lpi1 * .75f;
  r__1 = r__2 + *lpi2 * .125f;
  exc[contrl_1.order + i__ - 1] = r__1 + *lpi3 * 0.f;
  *lpi3 = *lpi2;
  *lpi2 = *lpi1;
  *lpi1 = lpi0;
  }
  i__1 = *ip;
  for (i__ = 1; i__ <= i__1; ++i__) {
  noise[contrl_1.order + i__ - 1] = random_(st) * 1.f / 64;
  hpi0 = noise[contrl_1.order + i__ - 1];
  r__2 = noise[contrl_1.order + i__ - 1] * -.125f + *hpi1 * .25f;
  r__1 = r__2 + *hpi2 * -.125f;
  noise[contrl_1.order + i__ - 1] = r__1 + *hpi3 * 0.f;
  *hpi3 = *hpi2;
  *hpi2 = *hpi1;
  *hpi1 = hpi0;
  }
  i__1 = *ip;
  for (i__ = 1; i__ <= i__1; ++i__) {
  exc[contrl_1.order + i__ - 1] += noise[contrl_1.order + i__ - 1];
  }
  }
 /* Synthesis filters: */
 /* Modify the excitation with all-zero filter 1 + G*SUM */
  xssq = 0.f;
  i__1 = *ip;
  for (i__ = 1; i__ <= i__1; ++i__) {
  k = contrl_1.order + i__;
  sum = 0.f;
  i__2 = contrl_1.order;
  for (j = 1; j <= i__2; ++j) {
  sum += coef[j] * exc[k - j - 1];
  }
  sum *= *g2pass;
  exc2[k - 1] = sum + exc[k - 1];
  }
 /* Synthesize using the all pole filter 1 / (1 - SUM) */
  i__1 = *ip;
  for (i__ = 1; i__ <= i__1; ++i__) {
  k = contrl_1.order + i__;
  sum = 0.f;
  i__2 = contrl_1.order;
  for (j = 1; j <= i__2; ++j) {
  sum += coef[j] * exc2[k - j - 1];
  }
  exc2[k - 1] = sum + exc2[k - 1];
  xssq += exc2[k - 1] * exc2[k - 1];
  }
 /* Save filter history for next epoch */
  i__1 = contrl_1.order;
  for (i__ = 1; i__ <= i__1; ++i__) {
  exc[i__ - 1] = exc[*ip + i__ - 1];
  exc2[i__ - 1] = exc2[*ip + i__ - 1];
  }
 /* Apply gain to match RMS */
  r__1 = *rms * *rms;
  ssq = r__1 * *ip;
  gain = (real)sqrt(ssq / xssq);
  i__1 = *ip;
  for (i__ = 1; i__ <= i__1; ++i__) {
  sout[i__] = gain * exc2[contrl_1.order + i__ - 1];
  }
  return 0;
 } /* bsynz_ */