#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.
{
    /* 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_ */