#include "f2c.h"
Include dependency graph for voicin.c:
Macros
#define	contrl_1 contrl_
Functions
int	voicin_ (integer vwin, real inbuf, real lpbuf, integer buflim, integer half, real minamd, real maxamd, integer mintau, real ivrc, integer obound, integer voibuf, integer af, struct lpc10_encoder_state *st)
Variables
struct {
logical corrp

integer lframe

integer order

}	contrl_
Macro Definition Documentation

◆ contrl_1

#define contrl_1 contrl_
Definition at line 53 of file voicin.c.
Function Documentation

◆ voicin_()

int voicin_	(	integer *	vwin,
		real *	inbuf,
		real *	lpbuf,
		integer *	buflim,
		integer *	half,
		real *	minamd,
		real *	maxamd,
		integer *	mintau,
		real *	ivrc,
		integer *	obound,
		integer *	voibuf,
		integer *	af,
		struct lpc10_encoder_state *	st
	)
Definition at line 258 of file voicin.c.
References lpc10_encoder_state::dither, lpc10_encoder_state::fbue, lpc10_encoder_state::fbve, i_nint(), L1, L2, lpc10_encoder_state::lbue, lpc10_encoder_state::lbve, max, lpc10_encoder_state::maxmin, min, lpc10_encoder_state::ofbue, lpc10_encoder_state::olbue, lpc10_encoder_state::sfbue, lpc10_encoder_state::slbue, lpc10_encoder_state::snr, value, lpc10_encoder_state::voice, and vparms_().
Referenced by analys_().
 {
  /* Initialized data */
 
  real *dither;
  static real vdc[100] /* was [10][10] */ = { 0.f,1714.f,-110.f,
  334.f,-4096.f,-654.f,3752.f,3769.f,0.f,1181.f,0.f,874.f,-97.f,
  300.f,-4096.f,-1021.f,2451.f,2527.f,0.f,-500.f,0.f,510.f,-70.f,
  250.f,-4096.f,-1270.f,2194.f,2491.f,0.f,-1500.f,0.f,500.f,-10.f,
  200.f,-4096.f,-1300.f,2e3f,2e3f,0.f,-2e3f,0.f,500.f,0.f,0.f,
  -4096.f,-1300.f,2e3f,2e3f,0.f,-2500.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
  0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
  0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
  0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f };
  static integer nvdcl = 5;
  static real vdcl[10] = { 600.f,450.f,300.f,200.f,0.f,0.f,0.f,0.f,0.f,0.f }
  ;
 
  /* System generated locals */
  integer inbuf_offset = 0, lpbuf_offset = 0, i__1, i__2;
  real r__1, r__2;
 
  /* Builtin functions */
  integer i_nint(real *);
  double sqrt(doublereal);
 
  /* Local variables */
  real ar_b__, ar_f__;
  integer *lbve, *lbue, *fbve, *fbue;
  integer snrl, i__;
  integer *ofbue, *sfbue;
  real *voice;
  integer *olbue, *slbue;
  real value[9];
  integer zc;
  logical ot;
  real qs;
  real *maxmin;
  integer vstate;
  real rc1;
  extern /* Subroutine */ int vparms_(integer *, real *, real *, integer *,
  integer *, real *, integer *, integer *, integer *, integer *,
  real *, real *, real *, real *);
  integer fbe, lbe;
  real *snr;
  real snr2;
 
 /* Global Variables: */
 /* Arguments */
 /* $Log$
  * Revision 1.16 2004/06/26 03:50:14 markster
  * Merge source cleanups (bug #1911)
  *
  * Revision 1.15 2003/11/23 22:14:32 markster
  * Various warning cleanups
  *
  * Revision 1.14 2003/02/12 13:59:15 matteo
  * mer feb 12 14:56:57 CET 2003
  *
  * 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 08:20:40 markster
  * Some OSS fixes and a few lpc changes to make it actually work
  *
  * Revision 1.2 1996/08/20 20:45:00 jaf
  * Removed all static local variables that were SAVE'd in the Fortran
  * code, and put them in struct lpc10_encoder_state that is passed as an
  * argument.
  *
  * Removed init function, since all initialization is now done in
  * init_lpc10_encoder_state().
  *
  * Revision 1.1 1996/08/19 22:30:14 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 */
 /* Voicing coefficient and Linear Discriminant Analysis variables:
 */
 /* Max number of VDC's and VDC levels */
 /* The following are not Fortran PARAMETER's, but they are */
 /* initialized with DATA statements, and never modified. */
 /* Actual number of VDC's and levels */
 /* Local variables that need not be saved */
 /* Note: */
 
 /* VALUE(1) through VALUE(8) are assigned values, but VALUE(9) */
 /* never is. Yet VALUE(9) is read in the loop that begins "DO I =
 */
 /* 1, 9" below. I believe that this doesn't cause any problems in
 */
 /* this subroutine, because all VDC(9,*) array elements are 0, and
 */
 /* this is what is multiplied by VALUE(9) in all cases. Still, it
 */
 /* would save a multiplication to change the loop to "DO I = 1, 8".
 */
 /* Local state */
 /* WARNING! */
 
 /* VOICE, SFBUE, and SLBUE should be saved from one invocation to */
 /* the next, but they are never given an initial value. */
 
 /* Does Fortran 77 specify some default initial value, like 0, or */
 /* is it undefined? If it is undefined, then this code should be */
 /* corrected to specify an initial value. */
 
 /* For VOICE, note that it is "shifted" in the statement that */
 /* begins "IF (HALF .EQ. 1) THEN" below. Also, uninitialized */
 /* values in the VOICE array can only affect entries in the VOIBUF
 */
 /* array that are for the same frame, or for an older frame. Thus
 */
 /* the effects of uninitialized values in VOICE cannot linger on */
 /* for more than 2 or 3 frame times. */
 
 /* For SFBUE and SLBUE, the effects of uninitialized values can */
 /* linger on for many frame times, because their previous values */
 /* are exponentially decayed. Thus it is more important to choose
 */
 /* initial values for these variables. I would guess that a */
 /* reasonable initial value for SFBUE is REF/16, the same as used */
 /* for FBUE and OFBUE. Similarly, SLBUE can be initialized to */
 /* REF/32, the same as for LBUE and OLBUE. */
 
 /* These guessed initial values should be validated by re-running */
 /* the modified program on some audio samples. */
 
 /* Declare and initialize filters: */
 
  dither = (&st->dither);
  snr = (&st->snr);
  maxmin = (&st->maxmin);
  voice = (&st->voice[0]);
  lbve = (&st->lbve);
  lbue = (&st->lbue);
  fbve = (&st->fbve);
  fbue = (&st->fbue);
  ofbue = (&st->ofbue);
  olbue = (&st->olbue);
  sfbue = (&st->sfbue);
  slbue = (&st->slbue);
 
  /* Parameter adjustments */
  if (vwin) {
  --vwin;
  }
  if (buflim) {
  --buflim;
  }
  if (inbuf) {
  inbuf_offset = buflim[1];
  inbuf -= inbuf_offset;
  }
  if (lpbuf) {
  lpbuf_offset = buflim[3];
  lpbuf -= lpbuf_offset;
  }
  if (ivrc) {
  --ivrc;
  }
  if (obound) {
  --obound;
  }
  if (voibuf) {
  --voibuf;
  }
 
  /* Function Body */
 
 /* The following variables are saved from one invocation to the */
 /* next, but are not initialized with DATA statements. This is */
 /* acceptable, because FIRST is initialized ot .TRUE., and the */
 /* first time that this subroutine is then called, they are all */
 /* given initial values. */
 
 /* SNR */
 /* LBVE, LBUE, FBVE, FBUE, OFBUE, OLBUE */
 
 /* MAXMIN is initialized on the first call, assuming that HALF */
 /* .EQ. 1 on first call. This is how ANALYS calls this subroutine.
 */
 
 /* Voicing Decision Parameter vector (* denotes zero coefficient): */
 
 /* * MAXMIN */
 /* LBE/LBVE */
 /* ZC */
 /* RC1 */
 /* QS */
 /* IVRC2 */
 /* aR_B */
 /* aR_F */
 /* * LOG(LBE/LBVE) */
 /* Define 2-D voicing decision coefficient vector according to the voicin
 g*/
 /* parameter order above. Each row (VDC vector) is optimized for a speci
 fic*/
 /* SNR. The last element of the vector is the constant. */
 /* E ZC RC1 Qs IVRC2 aRb aRf c */
 
 /* The VOICE array contains the result of the linear discriminant functio
 n*/
 /* (analog values). The VOIBUF array contains the hard-limited binary
 */
 /* voicing decisions. The VOICE and VOIBUF arrays, according to FORTRAN
  */
 /* memory allocation, are addressed as: */
 
 /* (half-frame number, future-frame number) */
 
 /* | Past | Present | Future1 | Future2 | */
 /* | 1,0 | 2,0 | 1,1 | 2,1 | 1,2 | 2,2 | 1,3 | 2,3 | ---> time */
 
 /* Update linear discriminant function history each frame: */
  if (*half == 1) {
  voice[0] = voice[2];
  voice[1] = voice[3];
  voice[2] = voice[4];
  voice[3] = voice[5];
  *maxmin = *maxamd / max(*minamd,1.f);
  }
 /* Calculate voicing parameters twice per frame: */
  vparms_(&vwin[1], &inbuf[inbuf_offset], &lpbuf[lpbuf_offset], &buflim[1],
  half, dither, mintau, &zc, &lbe, &fbe, &qs, &rc1, &ar_b__, &
  ar_f__);
 /* Estimate signal-to-noise ratio to select the appropriate VDC vector.
 */
 /* The SNR is estimated as the running average of the ratio of the */
 /* running average full-band voiced energy to the running average */
 /* full-band unvoiced energy. SNR filter has gain of 63. */
  r__1 = (*snr + *fbve / (real) max(*fbue,1)) * 63 / 64.f;
  *snr = (real) i_nint(&r__1);
  snr2 = *snr * *fbue / max(*lbue,1);
 /* Quantize SNR to SNRL according to VDCL thresholds. */
  snrl = 1;
  i__1 = nvdcl - 1;
  for (snrl = 1; snrl <= i__1; ++snrl) {
  if (snr2 > vdcl[snrl - 1]) {
  goto L69;
  }
  }
 /* (Note: SNRL = NVDCL here) */
 L69:
 /* Linear discriminant voicing parameters: */
  value[0] = *maxmin;
  value[1] = (real) lbe / max(*lbve,1);
  value[2] = (real) zc;
  value[3] = rc1;
  value[4] = qs;
  value[5] = ivrc[2];
  value[6] = ar_b__;
  value[7] = ar_f__;
 /* Evaluation of linear discriminant function: */
  voice[*half + 3] = vdc[snrl * 10 - 1];
  for (i__ = 1; i__ <= 8; ++i__) {
  voice[*half + 3] += vdc[i__ + snrl * 10 - 11] * value[i__ - 1];
  }
 /* Classify as voiced if discriminant > 0, otherwise unvoiced */
 /* Voicing decision for current half-frame: 1 = Voiced; 0 = Unvoiced */
  if (voice[*half + 3] > 0.f) {
  voibuf[*half + 6] = 1;
  } else {
  voibuf[*half + 6] = 0;
  }
 /* Skip voicing decision smoothing in first half-frame: */
 /* Give a value to VSTATE, so that trace statements below will print
 */
 /* a consistent value from one call to the next when HALF .EQ. 1. */
 /* The value of VSTATE is not used for any other purpose when this is
 */
 /* true. */
  vstate = -1;
  if (*half == 1) {
  goto L99;
  }
 /* Voicing decision smoothing rules (override of linear combination): */
 
 /* Unvoiced half-frames: At least two in a row. */
 /* -------------------- */
 
 /* Voiced half-frames: At least two in a row in one frame. */
 /* ------------------- Otherwise at least three in a row. */
 /* (Due to the way transition frames are encoded) */
 
 /* In many cases, the discriminant function determines how to smooth. */
 /* In the following chart, the decisions marked with a * may be overridden
 .*/
 
 /* Voicing override of transitions at onsets: */
 /* If a V/UV or UV/V voicing decision transition occurs within one-half
 */
 /* frame of an onset bounding a voicing window, then the transition is */
 /* moved to occur at the onset. */
 
 /* P 1F */
 /* ----- ----- */
 /* 0 0 0 0 */
 /* 0 0 0* 1 (If there is an onset there) */
 /* 0 0 1* 0* (Based on 2F and discriminant distance) */
 /* 0 0 1 1 */
 /* 0 1* 0 0 (Always) */
 /* 0 1* 0* 1 (Based on discriminant distance) */
 /* 0* 1 1 0* (Based on past, 2F, and discriminant distance) */
 /* 0 1* 1 1 (If there is an onset there) */
 /* 1 0* 0 0 (If there is an onset there) */
 /* 1 0 0 1 */
 /* 1 0* 1* 0 (Based on discriminant distance) */
 /* 1 0* 1 1 (Always) */
 /* 1 1 0 0 */
 /* 1 1 0* 1* (Based on 2F and discriminant distance) */
 /* 1 1 1* 0 (If there is an onset there) */
 /* 1 1 1 1 */
 
 /* Determine if there is an onset transition between P and 1F. */
 /* OT (Onset Transition) is true if there is an onset between */
 /* P and 1F but not after 1F. */
  ot = ((obound[1] & 2) != 0 || obound[2] == 1) && (obound[3] & 1) == 0;
 /* Multi-way dispatch on voicing decision history: */
  vstate = (voibuf[3] << 3) + (voibuf[4] << 2) + (voibuf[5] << 1) + voibuf[
  6];
  switch (vstate + 1) {
  case 1: goto L99;
  case 2: goto L1;
  case 3: goto L2;
  case 4: goto L99;
  case 5: goto L4;
  case 6: goto L5;
  case 7: goto L6;
  case 8: goto L7;
  case 9: goto L8;
  case 10: goto L99;
  case 11: goto L10;
  case 12: goto L11;
  case 13: goto L99;
  case 14: goto L13;
  case 15: goto L14;
  case 16: goto L99;
  }
 L1:
  if (ot && voibuf[7] == 1) {
  voibuf[5] = 1;
  }
  goto L99;
 L2:
  if (voibuf[7] == 0 || voice[2] < -voice[3]) {
  voibuf[5] = 0;
  } else {
  voibuf[6] = 1;
  }
  goto L99;
 L4:
  voibuf[4] = 0;
  goto L99;
 L5:
  if (voice[1] < -voice[2]) {
  voibuf[4] = 0;
  } else {
  voibuf[5] = 1;
  }
  goto L99;
 /* VOIBUF(2,0) must be 0 */
 L6:
  if (voibuf[1] == 1 || voibuf[7] == 1 || voice[3] > voice[0]) {
  voibuf[6] = 1;
  } else {
  voibuf[3] = 1;
  }
  goto L99;
 L7:
  if (ot) {
  voibuf[4] = 0;
  }
  goto L99;
 L8:
  if (ot) {
  voibuf[4] = 1;
  }
  goto L99;
 L10:
  if (voice[2] < -voice[1]) {
  voibuf[5] = 0;
  } else {
  voibuf[4] = 1;
  }
  goto L99;
 L11:
  voibuf[4] = 1;
  goto L99;
 L13:
  if (voibuf[7] == 0 && voice[3] < -voice[2]) {
  voibuf[6] = 0;
  } else {
  voibuf[5] = 1;
  }
  goto L99;
 L14:
  if (ot && voibuf[7] == 0) {
  voibuf[5] = 0;
  }
 /* GOTO 99 */
 L99:
 /* Now update parameters: */
 /* ---------------------- */
 
 /* During unvoiced half-frames, update the low band and full band unvoice
 d*/
 /* energy estimates (LBUE and FBUE) and also the zero crossing */
 /* threshold (DITHER). (The input to the unvoiced energy filters is */
 /* restricted to be less than 10dB above the previous inputs of the */
 /* filters.) */
 /* During voiced half-frames, update the low-pass (LBVE) and all-pass */
 /* (FBVE) voiced energy estimates. */
  if (voibuf[*half + 6] == 0) {
 /* Computing MIN */
  i__1 = fbe, i__2 = *ofbue * 3;
  r__1 = (*sfbue * 63 + (min(i__1,i__2) << 3)) / 64.f;
  *sfbue = i_nint(&r__1);
  *fbue = *sfbue / 8;
  *ofbue = fbe;
 /* Computing MIN */
  i__1 = lbe, i__2 = *olbue * 3;
  r__1 = (*slbue * 63 + (min(i__1,i__2) << 3)) / 64.f;
  *slbue = i_nint(&r__1);
  *lbue = *slbue / 8;
  *olbue = lbe;
  } else {
  r__1 = (*lbve * 63 + lbe) / 64.f;
  *lbve = i_nint(&r__1);
  r__1 = (*fbve * 63 + fbe) / 64.f;
  *fbve = i_nint(&r__1);
  }
 /* Set dither threshold to yield proper zero crossing rates in the */
 /* presence of low frequency noise and low level signal input. */
 /* NOTE: The divisor is a function of REF, the expected energies. */
 /* Computing MIN */
 /* Computing MAX */
  r__2 = (real)(sqrt((real) (*lbue * *lbve)) * 64 / 3000);
  r__1 = max(r__2,1.f);
  *dither = min(r__1,20.f);
 /* Voicing decisions are returned in VOIBUF. */
  return 0;
 } /* voicin_ */