#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_ */