vparms.c File Reference

#include "f2c.h"

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Functions
int	vparms_ (integer *vwin, real *inbuf, real *lpbuf, integer *buflim, integer *half, real *dither, integer *mintau, integer *zc, integer *lbe, integer *fbe, real *qs, real *rc1, real *ar_b__, real *ar_f__)

Variables
static real	c_b2 = 1.f

Function Documentation

vparms_()

int vparms_ ( integer *  vwin, real *  inbuf, real *  lpbuf, integer *  buflim, integer *  half, real *  dither, integer *  mintau, integer *  zc, integer *  lbe, integer *  fbe, real *  qs, real *  rc1, real *  ar_b__, real *  ar_f__  )

extern

Definition at line 134 of file vparms.c.

{
    /* System generated locals */
    integer inbuf_offset, lpbuf_offset, i__1;
    real r__1, r__2;
 
    /* Builtin functions */
    double r_sign(real *, real *);
    integer i_nint(real *);
 
    /* Local variables */
    integer vlen, stop, i__;
    real e_pre__;
    integer start;
    real ap_rms__, e_0__, oldsgn, lp_rms__, e_b__, e_f__, r_b__, r_f__, e0ap;
 
/*       Arguments */
/*       Local variables that need not be saved */
/*   Calculate zero crossings (ZC) and several energy and correlation */
/*   measures on low band and full band speech.  Each measure is taken */
/*   over either the first or the second half of the voicing window, */
/*   depending on the variable HALF. */
    /* Parameter adjustments */
    --vwin;
    --buflim;
    lpbuf_offset = buflim[3];
    lpbuf -= lpbuf_offset;
    inbuf_offset = buflim[1];
    inbuf -= inbuf_offset;
 
    /* Function Body */
    lp_rms__ = 0.f;
    ap_rms__ = 0.f;
    e_pre__ = 0.f;
    e0ap = 0.f;
    *rc1 = 0.f;
    e_0__ = 0.f;
    e_b__ = 0.f;
    e_f__ = 0.f;
    r_f__ = 0.f;
    r_b__ = 0.f;
    *zc = 0;
    vlen = vwin[2] - vwin[1] + 1;
    start = vwin[1] + (*half - 1) * vlen / 2 + 1;
    stop = start + vlen / 2 - 1;
 
/* I'll use the symbol HVL in the table below to represent the value */
/* VLEN/2.  Note that if VLEN is odd, then HVL should be rounded down, */
/* i.e., HVL = (VLEN-1)/2. */
 
/* HALF  START          STOP */
 
/* 1     VWIN(1)+1      VWIN(1)+HVL */
/* 2     VWIN(1)+HVL+1  VWIN(1)+2*HVL */
 
/* Note that if VLEN is even and HALF is 2, then STOP will be */
/* VWIN(1)+VLEN = VWIN(2)+1.  That could be bad, if that index of INBUF */
/* is undefined. */
 
    r__1 = inbuf[start - 1] - *dither;
    oldsgn = (real)r_sign(&c_b2, &r__1);
    i__1 = stop;
    for (i__ = start; i__ <= i__1; ++i__) {
    lp_rms__ += (r__1 = lpbuf[i__], abs(r__1));
    ap_rms__ += (r__1 = inbuf[i__], abs(r__1));
    e_pre__ += (r__1 = inbuf[i__] - inbuf[i__ - 1], abs(r__1));
/* Computing 2nd power */
    r__1 = inbuf[i__];
    e0ap += r__1 * r__1;
    *rc1 += inbuf[i__] * inbuf[i__ - 1];
/* Computing 2nd power */
    r__1 = lpbuf[i__];
    e_0__ += r__1 * r__1;
/* Computing 2nd power */
    r__1 = lpbuf[i__ - *mintau];
    e_b__ += r__1 * r__1;
/* Computing 2nd power */
    r__1 = lpbuf[i__ + *mintau];
    e_f__ += r__1 * r__1;
    r_f__ += lpbuf[i__] * lpbuf[i__ + *mintau];
    r_b__ += lpbuf[i__] * lpbuf[i__ - *mintau];
    r__1 = inbuf[i__] + *dither;
    if (r_sign(&c_b2, &r__1) != oldsgn) {
        ++(*zc);
        oldsgn = -oldsgn;
    }
    *dither = -(*dither);
    }
/*   Normalized short-term autocovariance coefficient at unit sample delay
 */
    *rc1 /= max(e0ap,1.f);
/*  Ratio of the energy of the first difference signal (6 dB/oct preemphas
is)*/
/*   to the energy of the full band signal */
/* Computing MAX */
    r__1 = ap_rms__ * 2.f;
    *qs = e_pre__ / max(r__1,1.f);
/*   aR_b is the product of the forward and reverse prediction gains, */
/*   looking backward in time (the causal case). */
    *ar_b__ = r_b__ / max(e_b__,1.f) * (r_b__ / max(e_0__,1.f));
/*  aR_f is the same as aR_b, but looking forward in time (non causal case
).*/
    *ar_f__ = r_f__ / max(e_f__,1.f) * (r_f__ / max(e_0__,1.f));
/*   Normalize ZC, LBE, and FBE to old fixed window length of 180. */
/*   (The fraction 90/VLEN has a range of .58 to 1) */
    r__2 = (real) (*zc << 1);
    r__1 = r__2 * (90.f / vlen);
    *zc = i_nint(&r__1);
/* Computing MIN */
    r__1 = lp_rms__ / 4 * (90.f / vlen);
    i__1 = i_nint(&r__1);
    *lbe = min(i__1,32767);
/* Computing MIN */
    r__1 = ap_rms__ / 4 * (90.f / vlen);
    i__1 = i_nint(&r__1);
    *fbe = min(i__1,32767);
    return 0;
} /* vparms_ */

References abs, c_b2, i_nint(), inbuf(), max, min, r_sign(), and stop.

Referenced by voicin_().

Variable Documentation

c_b2

real c_b2 = 1.f

static

Definition at line 35 of file vparms.c.

Referenced by vparms_().