bsynz.c
上传用户:zslianheng
上传日期:2013-04-03
资源大小:946k
文件大小:14k
- /*
- $Log: bsynz.c,v $
- Revision 1.1.1.1 2002/07/28 05:23:18 freeman_yong
- lpc10 codec
- * Revision 1.2 1996/08/20 20:18:55 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_decoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_decoder_state().
- *
- * Revision 1.1 1996/08/19 22:32:58 jaf
- * Initial revision
- *
- */
- #ifdef P_R_O_T_O_T_Y_P_E_S
- extern int bsynz_(real *coef, integer *ip, integer *iv, real *sout, real *rms, real *ratio, real *g2pass, struct lpc10_decoder_state *st);
- /* comlen contrl_ 12 */
- /*:ref: random_ 4 0 */
- #endif
- /* -- translated by f2c (version 19951025).
- You must link the resulting object file with the libraries:
- -lf2c -lm (in that order)
- */
- #include "f2c.h"
- /* Common Block Declarations */
- extern struct {
- integer order, lframe;
- logical corrp;
- } contrl_;
- #define contrl_1 contrl_
- /* ***************************************************************** */
- /* BSYNZ Version 54 */
- /* $Log: bsynz.c,v $
- /* Revision 1.1.1.1 2002/07/28 05:23:18 freeman_yong
- /* lpc10 codec
- /*
- * Revision 1.2 1996/08/20 20:18:55 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_decoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_decoder_state().
- *
- * Revision 1.1 1996/08/19 22:32:58 jaf
- * Initial revision
- * */
- /* Revision 1.4 1996/03/27 18:11:22 jaf */
- /* Changed the range of NOISE printed out in the debugging statements, */
- /* even though they are commented out. I didn't discover this until I */
- /* tried comparing two different versions of the LPC-10 coder, each with */
- /* full tracing enabled. */
- /* Revision 1.3 1996/03/26 19:33:23 jaf */
- /* Commented out trace statements. */
- /* Revision 1.2 1996/03/20 17:12:54 jaf */
- /* Added comments about which indices of array arguments are read or */
- /* written. */
- /* Rearranged local variable declarations to indicate which need to be */
- /* saved from one invocation to the next. Added entry INITBSYNZ to */
- /* reinitialize the local state variables, if desired. */
- /* Revision 1.1 1996/02/07 14:43:15 jaf */
- /* Initial revision */
- /* ***************************************************************** */
- /* Synthesize One Pitch Epoch */
- /* Input: */
- /* COEF - Predictor coefficients */
- /* Indices 1 through ORDER read. */
- /* IP - Pitch period (number of samples to synthesize) */
- /* IV - Voicing for the current epoch */
- /* RMS - Energy for the current epoch */
- /* RATIO - Energy slope for plosives */
- /* G2PASS- Sharpening factor for 2 pass synthesis */
- /* Output: */
- /* SOUT - Synthesized speech */
- /* Indices 1 through IP written. */
- /* This subroutine maintains local state from one call to the next. If */
- /* you want to switch to using a new audio stream for this filter, or */
- /* reinitialize its state for any other reason, call the ENTRY */
- /* INITBSYNZ. */
- /* Subroutine */ int bsynz_(real *coef, integer *ip, integer *iv,
- real *sout, real *rms, real *ratio, real *g2pass,
- struct lpc10_decoder_state *st)
- {
- /* Initialized data */
- integer *ipo;
- real *rmso;
- static integer kexc[25] = { 8,-16,26,-48,86,-162,294,-502,718,-728,184,
- 672,-610,-672,184,728,718,502,294,162,86,48,26,16,8 };
- real *exc;
- real *exc2;
- real *lpi1;
- real *lpi2;
- real *lpi3;
- real *hpi1;
- real *hpi2;
- real *hpi3;
- /* System generated locals */
- integer i__1, i__2;
- real r__1, r__2;
- /* Builtin functions */
- double sqrt(doublereal);
- /* Local variables */
- real gain, xssq;
- integer i__, j, k;
- real noise[166], pulse;
- integer px;
- real sscale;
- extern integer random_(struct lpc10_decoder_state *);
- real xy, sum, ssq;
- real lpi0, hpi0;
- /* $Log: bsynz.c,v $
- /* Revision 1.1.1.1 2002/07/28 05:23:18 freeman_yong
- /* lpc10 codec
- /*
- * Revision 1.2 1996/08/20 20:18:55 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_decoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_decoder_state().
- *
- * Revision 1.1 1996/08/19 22:32:58 jaf
- * Initial revision
- * */
- /* Revision 1.3 1996/03/29 22:03:47 jaf */
- /* Removed definitions for any constants that were no longer used. */
- /* Revision 1.2 1996/03/26 19:34:33 jaf */
- /* Added comments indicating which constants are not needed in an */
- /* application that uses the LPC-10 coder. */
- /* Revision 1.1 1996/02/07 14:43:51 jaf */
- /* Initial revision */
- /* LPC Configuration parameters: */
- /* Frame size, Prediction order, Pitch period */
- /* Arguments */
- /* $Log: bsynz.c,v $
- /* Revision 1.1.1.1 2002/07/28 05:23:18 freeman_yong
- /* lpc10 codec
- /*
- * Revision 1.2 1996/08/20 20:18:55 jaf
- * Removed all static local variables that were SAVE'd in the Fortran
- * code, and put them in struct lpc10_decoder_state that is passed as an
- * argument.
- *
- * Removed init function, since all initialization is now done in
- * init_lpc10_decoder_state().
- *
- * Revision 1.1 1996/08/19 22:32:58 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 */
- /* Function return value definitions */
- /* Parameters/constants */
- /* KEXC is not a Fortran PARAMETER, but it is an array initialized
- */
- /* with a DATA statement that is never modified. */
- /* Local variables that need not be saved */
- /* NOISE is declared with range (1:MAXPIT+MAXORD), but only indices
- */
- /* ORDER+1 through ORDER+IP are ever used, and I think that IP */
- /* .LE. MAXPIT. Why not declare it to be in the range (1:MAXPIT) */
- /* and use that range? */
- /* Local state */
- /* I believe that only indices 1 through ORDER of EXC need to be */
- /* saved from one invocation to the next, but we may as well save */
- /* the whole array. */
- /* None of these local variables were given initial values in the */
- /* original code. I'm guessing that 0 is a reasonable initial */
- /* value for all of them. */
- /* Parameter adjustments */
- if (coef) {
- --coef;
- }
- if (sout) {
- --sout;
- }
- /* Function Body */
- ipo = &(st->ipo);
- exc = &(st->exc[0]);
- exc2 = &(st->exc2[0]);
- lpi1 = &(st->lpi1);
- lpi2 = &(st->lpi2);
- lpi3 = &(st->lpi3);
- hpi1 = &(st->hpi1);
- hpi2 = &(st->hpi2);
- hpi3 = &(st->hpi3);
- rmso = &(st->rmso_bsynz);
- /* MAXPIT+MAXORD=166 */
- /* Calculate history scale factor XY and scale filter state */
- /* Computing MIN */
- r__1 = *rmso / (*rms + 1e-6f);
- xy = min(r__1,8.f);
- *rmso = *rms;
- i__1 = contrl_1.order;
- for (i__ = 1; i__ <= i__1; ++i__) {
- exc2[i__ - 1] = exc2[*ipo + i__ - 1] * xy;
- }
- *ipo = *ip;
- if (*iv == 0) {
- /* Generate white noise for unvoiced */
- i__1 = *ip;
- for (i__ = 1; i__ <= i__1; ++i__) {
- exc[contrl_1.order + i__ - 1] = (real) (random_(st) / 64);
- }
- /* Impulse doublet excitation for plosives */
- /* (RANDOM()+32768) is in the range 0 to 2**16-1. Therefore the
- */
- /* following expression should be evaluated using integers with
- at */
- /* least 32 bits (16 isn't enough), and PX should be in the rang
- e */
- /* ORDER+1+0 through ORDER+1+(IP-2) .EQ. ORDER+IP-1. */
- px = (random_(st) + 32768) * (*ip - 1) / 65536 + contrl_1.order + 1;
- r__1 = *ratio / 4 * 1.f;
- pulse = r__1 * 342;
- if (pulse > 2e3f) {
- pulse = 2e3f;
- }
- exc[px - 1] += pulse;
- exc[px] -= pulse;
- /* Load voiced excitation */
- } else {
- sscale = sqrt((real) (*ip)) / 6.928f;
- i__1 = *ip;
- for (i__ = 1; i__ <= i__1; ++i__) {
- exc[contrl_1.order + i__ - 1] = 0.f;
- if (i__ <= 25) {
- exc[contrl_1.order + i__ - 1] = sscale * kexc[i__ - 1];
- }
- lpi0 = exc[contrl_1.order + i__ - 1];
- r__2 = exc[contrl_1.order + i__ - 1] * .125f + *lpi1 * .75f;
- r__1 = r__2 + *lpi2 * .125f;
- exc[contrl_1.order + i__ - 1] = r__1 + *lpi3 * 0.f;
- *lpi3 = *lpi2;
- *lpi2 = *lpi1;
- *lpi1 = lpi0;
- }
- i__1 = *ip;
- for (i__ = 1; i__ <= i__1; ++i__) {
- noise[contrl_1.order + i__ - 1] = random_(st) * 1.f / 64;
- hpi0 = noise[contrl_1.order + i__ - 1];
- r__2 = noise[contrl_1.order + i__ - 1] * -.125f + *hpi1 * .25f;
- r__1 = r__2 + *hpi2 * -.125f;
- noise[contrl_1.order + i__ - 1] = r__1 + *hpi3 * 0.f;
- *hpi3 = *hpi2;
- *hpi2 = *hpi1;
- *hpi1 = hpi0;
- }
- i__1 = *ip;
- for (i__ = 1; i__ <= i__1; ++i__) {
- exc[contrl_1.order + i__ - 1] += noise[contrl_1.order + i__ - 1];
- }
- }
- /* Synthesis filters: */
- /* Modify the excitation with all-zero filter 1 + G*SUM */
- xssq = 0.f;
- i__1 = *ip;
- for (i__ = 1; i__ <= i__1; ++i__) {
- k = contrl_1.order + i__;
- sum = 0.f;
- i__2 = contrl_1.order;
- for (j = 1; j <= i__2; ++j) {
- sum += coef[j] * exc[k - j - 1];
- }
- sum *= *g2pass;
- exc2[k - 1] = sum + exc[k - 1];
- }
- /* Synthesize using the all pole filter 1 / (1 - SUM) */
- i__1 = *ip;
- for (i__ = 1; i__ <= i__1; ++i__) {
- k = contrl_1.order + i__;
- sum = 0.f;
- i__2 = contrl_1.order;
- for (j = 1; j <= i__2; ++j) {
- sum += coef[j] * exc2[k - j - 1];
- }
- exc2[k - 1] = sum + exc2[k - 1];
- xssq += exc2[k - 1] * exc2[k - 1];
- }
- /* Save filter history for next epoch */
- i__1 = contrl_1.order;
- for (i__ = 1; i__ <= i__1; ++i__) {
- exc[i__ - 1] = exc[*ip + i__ - 1];
- exc2[i__ - 1] = exc2[*ip + i__ - 1];
- }
- /* Apply gain to match RMS */
- r__1 = *rms * *rms;
- ssq = r__1 * *ip;
- gain = sqrt(ssq / xssq);
- i__1 = *ip;
- for (i__ = 1; i__ <= i__1; ++i__) {
- sout[i__] = gain * exc2[contrl_1.order + i__ - 1];
- }
- return 0;
- } /* bsynz_ */