vparms.c
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- /*
- $Log: vparms.c,v $
- Revision 1.1.1.1 2002/07/28 05:23:52 freeman_yong
- lpc10 codec
- * Revision 1.1 1996/08/19 22:30:04 jaf
- * Initial revision
- *
- */
- #ifdef P_R_O_T_O_T_Y_P_E_S
- 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__);
- #endif
- /* -- translated by f2c (version 19951025).
- You must link the resulting object file with the libraries:
- -lf2c -lm (in that order)
- */
- #include "f2c.h"
- /* Table of constant values */
- static real c_b2 = 1.f;
- /* ********************************************************************* */
- /* VPARMS Version 50 */
- /* $Log: vparms.c,v $
- /* Revision 1.1.1.1 2002/07/28 05:23:52 freeman_yong
- /* lpc10 codec
- /*
- * Revision 1.1 1996/08/19 22:30:04 jaf
- * Initial revision
- * */
- /* Revision 1.6 1996/03/29 18:01:16 jaf */
- /* Added some more comments about the range of INBUF and LPBUF that can */
- /* be read. Note that it is possible for index VWIN(2)+1 to be read from */
- /* INBUF, which might be outside of its defined range, although that will */
- /* require more careful checking. */
- /* Revision 1.5 1996/03/19 00:02:02 jaf */
- /* I just noticed that the argument DITHER is modified inside of this */
- /* subroutine. Comments were added explaining the possible final values. */
- /* Revision 1.4 1996/03/18 22:22:59 jaf */
- /* Finishing the job I said I did with the last check-in comments. */
- /* Revision 1.3 1996/03/18 22:22:17 jaf */
- /* Just added a few comments about which array indices of the arguments */
- /* are used, and mentioning that this subroutine has no local state. */
- /* Revision 1.2 1996/03/13 15:02:58 jaf */
- /* Comments added explaining that none of the local variables of this */
- /* subroutine need to be saved from one invocation to the next. */
- /* Revision 1.1 1996/02/07 14:50:42 jaf */
- /* Initial revision */
- /* ********************************************************************* */
- /* Calculate voicing parameters: */
- /* Input: */
- /* VWIN - Voicing window limits */
- /* Indices 1 through 2 read. */
- /* INBUF - Input speech buffer */
- /* Indices START-1 through STOP read, */
- /* where START and STOP are defined in the code (only written once).
- */
- /* Note that STOP can be as large as VWIN(2)+1 ! */
- /* LPBUF - Low pass filtered speech */
- /* Indices START-MINTAU through STOP+MINTAU read, */
- /* where START and STOP are defined in the code (only written once).
- */
- /* BUFLIM - Array bounds for INBUF and LPBUF */
- /* Indices 1 through 4 read. */
- /* HALF - Half frame (1 or 2) */
- /* MINTAU - Lag corresponding to minimum AMDF value (pitch estimate) */
- /* Input/Output: */
- /* DITHER - Zero crossing threshold */
- /* The resulting value might be the negation of the input */
- /* value. It might always be the same as the input value, */
- /* if the DO loop below always executes an even number of times. */
- /* Output: (all of them are written on every call) */
- /* ZC - Zero crossing rate */
- /* LBE - Low band energy (sum of magnitudes - SM) */
- /* FBE - Full band energy (SM) */
- /* QS - Ratio of 6 dB/oct preemphasized energy to full band energy */
- /* RC1 - First reflection coefficient */
- /* AR_B - Product of the causal forward and reverse pitch */
- /* prediction gains */
- /* AR_F - Product of the noncausal forward and reverse pitch */
- /* prediction gains */
- /* Internal: */
- /* OLDSGN - Previous sign of dithered signal */
- /* VLEN - Length of voicing window */
- /* START - Lower address of current half of voicing window */
- /* STOP - Upper address of current half of voicing window */
- /* E_0 - Energy of LPF speech (sum of squares - SS) */
- /* E_B - Energy of LPF speech backward one pitch period (SS) */
- /* E_F - Energy of LPF speech forward one pitch period (SS) */
- /* R_B - Autocovariance of LPF speech backward one pitch period */
- /* R_F - Autocovariance of LPF speech forward one pitch period */
- /* LP_RMS - Energy of LPF speech (sum of magnitudes - SM) */
- /* AP_RMS - Energy of all-pass speech (SM) */
- /* E_PRE - Energy of 6dB preemphasized speech (SM) */
- /* E0AP - Energy of all-pass speech (SS) */
- /* This subroutine has no local state. */
- /* Subroutine */ 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__)
- {
- /* 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 = 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_ */