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Revision 1.2 2000/01/05 08:20:40 markster
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Some OSS fixes and a few lpc changes to make it actually work
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* Revision 1.1 1996/08/19 22:30:04 jaf
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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern 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__);
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/* -- translated by f2c (version 19951025).
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You must link the resulting object file with the libraries:
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-lf2c -lm (in that order)
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/* Table of constant values */
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static real c_b2 = 1.f;
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/* ********************************************************************* */
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/* VPARMS Version 50 */
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/* Revision 1.2 2000/01/05 08:20:40 markster
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/* Some OSS fixes and a few lpc changes to make it actually work
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* Revision 1.1 1996/08/19 22:30:04 jaf
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/* Revision 1.6 1996/03/29 18:01:16 jaf */
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/* Added some more comments about the range of INBUF and LPBUF that can */
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/* be read. Note that it is possible for index VWIN(2)+1 to be read from */
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/* INBUF, which might be outside of its defined range, although that will */
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/* require more careful checking. */
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/* Revision 1.5 1996/03/19 00:02:02 jaf */
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/* I just noticed that the argument DITHER is modified inside of this */
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/* subroutine. Comments were added explaining the possible final values. */
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/* Revision 1.4 1996/03/18 22:22:59 jaf */
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/* Finishing the job I said I did with the last check-in comments. */
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/* Revision 1.3 1996/03/18 22:22:17 jaf */
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/* Just added a few comments about which array indices of the arguments */
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/* are used, and mentioning that this subroutine has no local state. */
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/* Revision 1.2 1996/03/13 15:02:58 jaf */
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/* Comments added explaining that none of the local variables of this */
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/* subroutine need to be saved from one invocation to the next. */
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/* Revision 1.1 1996/02/07 14:50:42 jaf */
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/* Initial revision */
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/* ********************************************************************* */
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/* Calculate voicing parameters: */
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/* VWIN - Voicing window limits */
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/* Indices 1 through 2 read. */
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/* INBUF - Input speech buffer */
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/* Indices START-1 through STOP read, */
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/* where START and STOP are defined in the code (only written once).
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/* Note that STOP can be as large as VWIN(2)+1 ! */
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/* LPBUF - Low pass filtered speech */
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/* Indices START-MINTAU through STOP+MINTAU read, */
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/* where START and STOP are defined in the code (only written once).
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/* BUFLIM - Array bounds for INBUF and LPBUF */
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/* Indices 1 through 4 read. */
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/* HALF - Half frame (1 or 2) */
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/* MINTAU - Lag corresponding to minimum AMDF value (pitch estimate) */
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/* DITHER - Zero crossing threshold */
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/* The resulting value might be the negation of the input */
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/* value. It might always be the same as the input value, */
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/* if the DO loop below always executes an even number of times. */
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/* Output: (all of them are written on every call) */
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/* ZC - Zero crossing rate */
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/* LBE - Low band energy (sum of magnitudes - SM) */
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/* FBE - Full band energy (SM) */
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/* QS - Ratio of 6 dB/oct preemphasized energy to full band energy */
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/* RC1 - First reflection coefficient */
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/* AR_B - Product of the causal forward and reverse pitch */
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/* prediction gains */
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/* AR_F - Product of the noncausal forward and reverse pitch */
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/* prediction gains */
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/* OLDSGN - Previous sign of dithered signal */
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/* VLEN - Length of voicing window */
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/* START - Lower address of current half of voicing window */
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/* STOP - Upper address of current half of voicing window */
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/* E_0 - Energy of LPF speech (sum of squares - SS) */
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/* E_B - Energy of LPF speech backward one pitch period (SS) */
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/* E_F - Energy of LPF speech forward one pitch period (SS) */
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/* R_B - Autocovariance of LPF speech backward one pitch period */
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/* R_F - Autocovariance of LPF speech forward one pitch period */
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/* LP_RMS - Energy of LPF speech (sum of magnitudes - SM) */
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/* AP_RMS - Energy of all-pass speech (SM) */
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/* E_PRE - Energy of 6dB preemphasized speech (SM) */
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/* E0AP - Energy of all-pass speech (SS) */
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/* This subroutine has no local state. */
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/* Subroutine */ int vparms_(integer *vwin, real *inbuf, real *lpbuf, integer
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*buflim, integer *half, real *dither, integer *mintau, integer *zc,
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integer *lbe, integer *fbe, real *qs, real *rc1, real *ar_b__, real *
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/* System generated locals */
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integer inbuf_offset, lpbuf_offset, i__1;
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/* Builtin functions */
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double r_sign(real *, real *);
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integer i_nint(real *);
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/* Local variables */
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integer vlen, stop, i__;
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real ap_rms__, e_0__, oldsgn, lp_rms__, e_b__, e_f__, r_b__, r_f__, e0ap;
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/* Local variables that need not be saved */
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/* Calculate zero crossings (ZC) and several energy and correlation */
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/* measures on low band and full band speech. Each measure is taken */
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/* over either the first or the second half of the voicing window, */
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/* depending on the variable HALF. */
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/* Parameter adjustments */
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lpbuf_offset = buflim[3];
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lpbuf -= lpbuf_offset;
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inbuf_offset = buflim[1];
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inbuf -= inbuf_offset;
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vlen = vwin[2] - vwin[1] + 1;
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start = vwin[1] + (*half - 1) * vlen / 2 + 1;
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stop = start + vlen / 2 - 1;
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/* I'll use the symbol HVL in the table below to represent the value */
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/* VLEN/2. Note that if VLEN is odd, then HVL should be rounded down, */
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/* i.e., HVL = (VLEN-1)/2. */
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/* HALF START STOP */
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/* 1 VWIN(1)+1 VWIN(1)+HVL */
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/* 2 VWIN(1)+HVL+1 VWIN(1)+2*HVL */
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/* Note that if VLEN is even and HALF is 2, then STOP will be */
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/* VWIN(1)+VLEN = VWIN(2)+1. That could be bad, if that index of INBUF */
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r__1 = inbuf[start - 1] - *dither;
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oldsgn = r_sign(&c_b2, &r__1);
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for (i__ = start; i__ <= i__1; ++i__) {
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lp_rms__ += (r__1 = lpbuf[i__], abs(r__1));
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ap_rms__ += (r__1 = inbuf[i__], abs(r__1));
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e_pre__ += (r__1 = inbuf[i__] - inbuf[i__ - 1], abs(r__1));
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/* Computing 2nd power */
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*rc1 += inbuf[i__] * inbuf[i__ - 1];
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/* Computing 2nd power */
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e_0__ += r__1 * r__1;
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/* Computing 2nd power */
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r__1 = lpbuf[i__ - *mintau];
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e_b__ += r__1 * r__1;
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/* Computing 2nd power */
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r__1 = lpbuf[i__ + *mintau];
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e_f__ += r__1 * r__1;
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r_f__ += lpbuf[i__] * lpbuf[i__ + *mintau];
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r_b__ += lpbuf[i__] * lpbuf[i__ - *mintau];
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r__1 = inbuf[i__] + *dither;
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if (r_sign(&c_b2, &r__1) != oldsgn) {
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*dither = -(*dither);
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/* Normalized short-term autocovariance coefficient at unit sample delay
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*rc1 /= max(e0ap,1.f);
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/* Ratio of the energy of the first difference signal (6 dB/oct preemphas
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/* to the energy of the full band signal */
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r__1 = ap_rms__ * 2.f;
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*qs = e_pre__ / max(r__1,1.f);
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/* aR_b is the product of the forward and reverse prediction gains, */
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/* looking backward in time (the causal case). */
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*ar_b__ = r_b__ / max(e_b__,1.f) * (r_b__ / max(e_0__,1.f));
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/* aR_f is the same as aR_b, but looking forward in time (non causal case
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*ar_f__ = r_f__ / max(e_f__,1.f) * (r_f__ / max(e_0__,1.f));
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/* Normalize ZC, LBE, and FBE to old fixed window length of 180. */
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/* (The fraction 90/VLEN has a range of .58 to 1) */
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r__2 = (real) (*zc << 1);
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r__1 = r__2 * (90.f / vlen);
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r__1 = lp_rms__ / 4 * (90.f / vlen);
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i__1 = i_nint(&r__1);
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*lbe = min(i__1,32767);
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r__1 = ap_rms__ / 4 * (90.f / vlen);
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i__1 = i_nint(&r__1);
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*fbe = min(i__1,32767);
added
removed
codecs/lpc10/vparms.c
