632 lines
24 KiB
C
632 lines
24 KiB
C
/*
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$Log: analys.c,v $
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Revision 1.1 2004/05/04 11:16:42 csoutheren
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Initial version
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Revision 1.2 2002/02/15 03:57:55 yurik
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Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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Revision 1.1 2000/06/05 04:45:12 robertj
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Added LPC-10 2400bps codec
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* Revision 1.2 1996/08/20 20:16:01 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_encoder_state().
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*
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* Revision 1.1 1996/08/19 22:29:08 jaf
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* Initial revision
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*
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*/
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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern int analys_(real *speech, integer *voice, integer *pitch, real *rms, real *rc, struct lpc10_encoder_state *st);
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/* comlen contrl_ 12 */
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/*:ref: preemp_ 14 5 6 6 4 6 6 */
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/*:ref: onset_ 14 7 6 4 4 4 4 4 4 */
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/*:ref: placev_ 14 11 4 4 4 4 4 4 4 4 4 4 4 */
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/*:ref: lpfilt_ 14 4 6 6 4 4 */
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/*:ref: ivfilt_ 14 5 6 6 4 4 6 */
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/*:ref: tbdm_ 14 8 6 4 4 4 6 4 4 4 */
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/*:ref: voicin_ 14 12 4 6 6 4 4 6 6 4 6 4 4 4 */
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/*:ref: dyptrk_ 14 6 6 4 4 4 4 4 */
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/*:ref: placea_ 14 9 4 4 4 4 4 4 4 4 4 */
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/*:ref: dcbias_ 14 3 4 6 6 */
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/*:ref: energy_ 14 3 4 6 6 */
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/*:ref: mload_ 14 6 4 4 4 6 6 6 */
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/*:ref: invert_ 14 4 4 6 6 6 */
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/*:ref: rcchk_ 14 3 4 6 6 */
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/*:ref: initonset_ 14 0 */
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/*:ref: initvoicin_ 14 0 */
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/*:ref: initdyptrk_ 14 0 */
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/* Rerunning f2c -P may change prototypes or declarations. */
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#endif
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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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*/
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#include "f2c.h"
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/* Common Block Declarations */
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extern struct {
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integer order, lframe;
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logical corrp;
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} contrl_;
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#define contrl_1 contrl_
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/* Table of constant values */
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static integer c__10 = 10;
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static integer c__181 = 181;
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static integer c__720 = 720;
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static integer c__3 = 3;
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static integer c__90 = 90;
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static integer c__156 = 156;
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static integer c__307 = 307;
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static integer c__462 = 462;
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static integer c__312 = 312;
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static integer c__60 = 60;
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static integer c__1 = 1;
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/* ****************************************************************** */
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/* ANALYS Version 55 */
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/* $Log: analys.c,v $
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* Revision 1.1 2004/05/04 11:16:42 csoutheren
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* Initial version
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*
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* Revision 1.2 2002/02/15 03:57:55 yurik
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* Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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*
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* Revision 1.1 2000/06/05 04:45:12 robertj
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* Added LPC-10 2400bps codec
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*
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* Revision 1.2 1996/08/20 20:16:01 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_encoder_state().
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*
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* Revision 1.1 1996/08/19 22:29:08 jaf
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* Initial revision
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*
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*/
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/* Revision 1.9 1996/05/23 19:41:07 jaf */
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/* Commented out some unnecessary lines that were reading uninitialized */
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/* values. */
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/* Revision 1.8 1996/03/27 23:57:55 jaf */
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/* Added some comments about which indices of the local buffers INBUF, */
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/* LPBUF, etc., get read or modified by some of the subroutine calls. I */
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/* just did this while trying to figure out the discrepancy between the */
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/* embedded code compiled with all local variables implicitly saved, and */
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/* without. */
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/* I added some debugging write statements in hopes of finding a problem. */
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/* None of them ever printed anything while running with the long input */
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/* speech file dam9.spd provided in the distribution. */
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/* Revision 1.7 1996/03/27 18:06:20 jaf */
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/* Commented out access to MAXOSP, which is just a debugging variable */
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/* that was defined in the COMMON block CONTRL in contrl.fh. */
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/* Revision 1.6 1996/03/26 19:31:33 jaf */
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/* Commented out trace statements. */
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/* Revision 1.5 1996/03/21 15:19:35 jaf */
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/* Added comments for ENTRY PITDEC. */
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/* Revision 1.4 1996/03/19 20:54:27 jaf */
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/* Added a line to INITANALYS. See comments there. */
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/* Revision 1.3 1996/03/19 20:52:49 jaf */
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/* Rearranged the order of the local variables quite a bit, to separate */
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/* them into groups of "constants", "locals that don't need to be saved */
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/* from one call to the next", and "local that do need to be saved from */
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/* one call to the next". */
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/* Several locals in the last set should have been given initial values, */
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/* but weren't. I gave them all initial values of 0. */
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/* Added a separate ENTRY INITANALYS that initializes all local state */
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/* that should be, and also calls the corresponding entries of the */
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/* subroutines called by ANALYS that also have local state. */
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/* There used to be DATA statements in ANALYS. I got rid of most of */
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/* them, and added a local logical variable FIRST that calls the entry */
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/* INITANALYS on the first call to ANALYS. This is just so that one need */
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/* not remember to call INITANALYS first in order for the state to be */
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/* initialized. */
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/* Revision 1.2 1996/03/11 23:29:32 jaf */
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/* Added several comments with my own personal questions about the */
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/* Fortran 77 meaning of the parameters passed to the subroutine PREEMP. */
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/* Revision 1.1 1996/02/07 14:42:29 jaf */
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/* Initial revision */
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/* ****************************************************************** */
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/* SUBROUTINE ANALYS */
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/* Input: */
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/* SPEECH */
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/* Indices 1 through LFRAME read. */
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/* Output: */
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/* VOICE */
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/* Indices 1 through 2 written. */
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/* PITCH */
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/* Written in subroutine DYPTRK, and then perhaps read and written */
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/* some more. */
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/* RMS */
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/* Written. */
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/* RC */
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/* Indices 1 through ORDER written (ORDER defined in contrl.fh). */
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/* This subroutine maintains local state from one call to the next. If */
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/* you want to switch to using a new audio stream for this filter, or */
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/* reinitialize its state for any other reason, call the ENTRY */
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/* INITANALYS. */
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/* ENTRY PITDEC */
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/* Input: */
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/* PITCH - Encoded pitch index */
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/* Output: */
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/* PTAU - Decoded pitch period */
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/* This entry has no local state. It accesses a "constant" array */
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/* declared in ANALYS. */
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/* Subroutine */ int analys_(real *speech, integer *voice, integer
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*pitch, real *rms, real *rc, struct lpc10_encoder_state *st)
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{
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/* Initialized data */
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static integer tau[60] = { 20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,
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35,36,37,38,39,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,
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74,76,78,80,84,88,92,96,100,104,108,112,116,120,124,128,132,136,
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140,144,148,152,156 };
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static integer buflim[4] = { 181,720,25,720 };
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static real precoef = .9375f;
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/* System generated locals */
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integer i__1;
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/* Local variables */
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real amdf[60];
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integer half;
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real abuf[156];
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real *bias;
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extern /* Subroutine */ int tbdm_(real *, integer *, integer *, integer *,
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real *, integer *, integer *, integer *);
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integer *awin;
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integer midx, ewin[6] /* was [2][3] */;
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real ivrc[2], temp;
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real *zpre;
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integer *vwin;
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integer i__, j, lanal;
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extern /* Subroutine */ int rcchk_(integer *, real *, real *), mload_(
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integer *, integer *, integer *, real *, real *, real *);
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real *inbuf, *pebuf;
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real *lpbuf, *ivbuf;
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real *rcbuf;
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integer *osbuf;
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extern /* Subroutine */ int onset_(real *, integer *, integer *, integer *
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, integer *, integer *, integer *, struct lpc10_encoder_state *);
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integer *osptr;
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extern /* Subroutine */ placea_(integer *, integer *
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, integer *, integer *, integer *, integer *, integer *, integer *
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, integer *), dcbias_(integer *, real *, real *), placev_(integer
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*, integer *, integer *, integer *, integer *, integer *, integer
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*, integer *, integer *, integer *, integer *);
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integer ipitch;
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integer *obound;
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extern /* Subroutine */ int preemp_(real *, real *, integer *, real *,
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real *), voicin_(integer *, real *, real *, integer *, integer *,
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real *, real *, integer *, real *, integer *, integer *, integer *,
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struct lpc10_encoder_state *);
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integer *voibuf;
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integer mintau;
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real *rmsbuf;
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extern /* Subroutine */ int lpfilt_(real *, real *, integer *, integer *),
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ivfilt_(real *, real *, integer *, integer *, real *), energy_(
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integer *, real *, real *), invert_(integer *, real *, real *,
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real *);
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integer minptr, maxptr;
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extern /* Subroutine */ int dyptrk_(real *, integer *, integer *, integer
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*, integer *, integer *, struct lpc10_encoder_state *);
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real phi[100] /* was [10][10] */, psi[10];
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/* $Log: analys.c,v $
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* Revision 1.1 2004/05/04 11:16:42 csoutheren
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* Initial version
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*
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* Revision 1.2 2002/02/15 03:57:55 yurik
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* Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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*
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* Revision 1.1 2000/06/05 04:45:12 robertj
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* Added LPC-10 2400bps codec
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*
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* Revision 1.2 1996/08/20 20:16:01 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_encoder_state().
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*
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* Revision 1.1 1996/08/19 22:29:08 jaf
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* Initial revision
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*
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*/
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/* Revision 1.3 1996/03/29 22:03:47 jaf */
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/* Removed definitions for any constants that were no longer used. */
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/* Revision 1.2 1996/03/26 19:34:33 jaf */
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/* Added comments indicating which constants are not needed in an */
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/* application that uses the LPC-10 coder. */
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/* Revision 1.1 1996/02/07 14:43:51 jaf */
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/* Initial revision */
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/* LPC Configuration parameters: */
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/* Frame size, Prediction order, Pitch period */
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/* Arguments to ANALYS */
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/* $Log: analys.c,v $
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* Revision 1.1 2004/05/04 11:16:42 csoutheren
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* Initial version
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*
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* Revision 1.2 2002/02/15 03:57:55 yurik
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* Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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*
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* Revision 1.1 2000/06/05 04:45:12 robertj
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* Added LPC-10 2400bps codec
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*
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* Revision 1.2 1996/08/20 20:16:01 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_encoder_state().
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*
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* Revision 1.1 1996/08/19 22:29:08 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/29 22:05:55 jaf */
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/* Commented out the common block variables that are not needed by the */
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/* embedded version. */
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/* Revision 1.2 1996/03/26 19:34:50 jaf */
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/* Added comments indicating which constants are not needed in an */
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/* application that uses the LPC-10 coder. */
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/* Revision 1.1 1996/02/07 14:44:09 jaf */
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/* Initial revision */
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/* LPC Processing control variables: */
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/* *** Read-only: initialized in setup */
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/* Files for Speech, Parameter, and Bitstream Input & Output, */
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/* and message and debug outputs. */
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/* Here are the only files which use these variables: */
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/* lpcsim.f setup.f trans.f error.f vqsetup.f */
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/* Many files which use fdebug are not listed, since it is only used in */
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/* those other files conditionally, to print trace statements. */
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/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
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/* LPC order, Frame size, Quantization rate, Bits per frame, */
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/* Error correction */
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/* Subroutine SETUP is the only place where order is assigned a value, */
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/* and that value is 10. It could increase efficiency 1% or so to */
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/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
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*/
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/* a variable in a COMMON block, since it is used in many places in the */
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/* core of the coding and decoding routines. Actually, I take that back.
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*/
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/* At least when compiling with f2c, the upper bound of DO loops is */
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/* stored in a local variable before the DO loop begins, and then that is
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*/
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/* compared against on each iteration. */
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/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
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/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
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/* is used in only a few places, and never in the core coding and */
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/* decoding routines, so it could be eliminated entirely. */
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/* nbits is similar to quant, and is given a value of 54 in SETUP. */
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/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
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/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
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/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
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*/
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/* a constant or a variable, since it is only examined once per frame. */
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/* Leaving it as a variable that is set to .TRUE. seems like a good */
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/* idea, since it does enable some error-correction capability for */
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/* unvoiced frames, with no change in the coding rate, and no noticeable
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*/
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/* quality difference in the decoded speech. */
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/* integer quant, nbits */
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/* *** Read/write: variables for debugging, not needed for LPC algorithm
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*/
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/* Current frame, Unstable frames, Output clip count, Max onset buffer,
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*/
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/* Debug listing detail level, Line count on listing page */
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/* nframe is not needed for an embedded LPC10 at all. */
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/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
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/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
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/* an application, I would recommend removing the call to ERROR in RCCHK,
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*/
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/* and remove ERROR and nunsfm completely. */
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/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
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*/
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/* sread.f. When LPC10 is embedded into an application, one might want */
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/* to cause it to be incremented in a routine that takes the output of */
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/* SYNTHS and sends it to an audio device. It could be optionally */
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/* displayed, for those that might want to know what it is. */
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/* maxosp is never initialized to 0 in SETUP, although it probably should
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*/
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/* be, and it is updated in subroutine ANALYS. I doubt that its value */
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/* would be of much interest to an application in which LPC10 is */
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/* embedded. */
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/* listl and lincnt are not needed for an embedded LPC10 at all. */
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/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
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/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
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/* common /contrl/ quant, nbits */
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/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
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/* Arguments to entry PITDEC (below) */
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/* Parameters/constants */
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/* Constants */
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/* NF = Number of frames */
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/* AF = Frame in which analysis is done */
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/* OSLEN = Length of the onset buffer */
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/* LTAU = Number of pitch lags */
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/* SBUFL, SBUFH = Start and end index of speech buffers */
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/* LBUFL, LBUFH = Start and end index of LPF speech buffer */
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/* MINWIN, MAXWIN = Min and Max length of voicing (and analysis) windows
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*/
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/* PWLEN, PWINH, PWINL = Length, upper and lower limits of pitch window
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*/
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/* DVWINL, DVWINH = Default lower and upper limits of voicing window */
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/* The tables TAU and BUFLIM, and the variable PRECOEF, are not */
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/* Fortran PARAMETER's, but they are initialized with DATA */
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/* statements, and never modified. Thus, they need not have SAVE */
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/* statements for them to keep their values from one invocation to
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*/
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/* the next. */
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/* Local variables that need not be saved */
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/* Local state */
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/* Data Buffers */
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/* INBUF Raw speech (with DC bias removed each frame) */
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/* PEBUF Preemphasized speech */
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/* LPBUF Low pass speech buffer */
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/* IVBUF Inverse filtered speech */
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/* OSBUF Indexes of onsets in speech buffers */
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/* VWIN Voicing window indices */
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/* AWIN Analysis window indices */
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/* EWIN Energy window indices */
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/* VOIBUF Voicing decisions on windows in VWIN */
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/* RMSBUF RMS energy */
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/* RCBUF Reflection Coefficients */
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/* Pitch is handled separately from the above parameters. */
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/* The following variables deal with pitch: */
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/* MIDX Encoded initial pitch estimate for analysis frame */
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/* IPITCH Initial pitch computed for frame AF (decoded from MIDX) */
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/* PITCH The encoded pitch value (index into TAU) for the present */
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/* frame (delayed and smoothed by Dyptrack) */
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/* Parameter adjustments */
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if (speech) {
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--speech;
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}
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if (voice) {
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--voice;
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}
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if (rc) {
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--rc;
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}
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/* Function Body */
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/* Calculations are done on future frame due to requirements */
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/* of the pitch tracker. Delay RMS and RC's 2 frames to give */
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/* current frame parameters on return. */
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/* Update all buffers */
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inbuf = &(st->inbuf[0]);
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pebuf = &(st->pebuf[0]);
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lpbuf = &(st->lpbuf[0]);
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ivbuf = &(st->ivbuf[0]);
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bias = &(st->bias);
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osbuf = &(st->osbuf[0]);
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osptr = &(st->osptr);
|
|
obound = &(st->obound[0]);
|
|
vwin = &(st->vwin[0]);
|
|
awin = &(st->awin[0]);
|
|
voibuf = &(st->voibuf[0]);
|
|
rmsbuf = &(st->rmsbuf[0]);
|
|
rcbuf = &(st->rcbuf[0]);
|
|
zpre = &(st->zpre);
|
|
|
|
i__1 = 720 - contrl_1.lframe;
|
|
for (i__ = 181; i__ <= i__1; ++i__) {
|
|
inbuf[i__ - 181] = inbuf[contrl_1.lframe + i__ - 181];
|
|
pebuf[i__ - 181] = pebuf[contrl_1.lframe + i__ - 181];
|
|
}
|
|
i__1 = 540 - contrl_1.lframe;
|
|
for (i__ = 229; i__ <= i__1; ++i__) {
|
|
ivbuf[i__ - 229] = ivbuf[contrl_1.lframe + i__ - 229];
|
|
}
|
|
i__1 = 720 - contrl_1.lframe;
|
|
for (i__ = 25; i__ <= i__1; ++i__) {
|
|
lpbuf[i__ - 25] = lpbuf[contrl_1.lframe + i__ - 25];
|
|
}
|
|
j = 1;
|
|
i__1 = (*osptr) - 1;
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
|
if (osbuf[i__ - 1] > contrl_1.lframe) {
|
|
osbuf[j - 1] = osbuf[i__ - 1] - contrl_1.lframe;
|
|
++j;
|
|
}
|
|
}
|
|
*osptr = j;
|
|
voibuf[0] = voibuf[2];
|
|
voibuf[1] = voibuf[3];
|
|
for (i__ = 1; i__ <= 2; ++i__) {
|
|
vwin[(i__ << 1) - 2] = vwin[(i__ + (1 << 1)) - 2] - contrl_1.lframe;
|
|
vwin[(i__ << 1) - 1] = vwin[(i__ + (1 << 1)) - 1] - contrl_1.lframe;
|
|
awin[(i__ << 1) - 2] = awin[(i__ + (1 << 1)) - 2] - contrl_1.lframe;
|
|
awin[(i__ << 1) - 1] = awin[(i__ + (1 << 1)) - 1] - contrl_1.lframe;
|
|
/* EWIN(*,J) is unused for J .NE. AF, so the following shift is
|
|
*/
|
|
/* unnecessary. It also causes error messages when the C versio
|
|
n */
|
|
/* of the code created from this by f2c is run with Purify. It
|
|
*/
|
|
/* correctly complains that uninitialized memory is being read.
|
|
*/
|
|
/* EWIN(1,I) = EWIN(1,I+1) - LFRAME */
|
|
/* EWIN(2,I) = EWIN(2,I+1) - LFRAME */
|
|
obound[i__ - 1] = obound[i__];
|
|
voibuf[i__ * 2] = voibuf[(i__ + 1) * 2];
|
|
voibuf[(i__ << 1) + 1] = voibuf[(i__ + (1 << 1)) + 1];
|
|
rmsbuf[i__ - 1] = rmsbuf[i__];
|
|
i__1 = contrl_1.order;
|
|
for (j = 1; j <= i__1; ++j) {
|
|
rcbuf[j + i__ * 10 - 11] = rcbuf[j + (i__ + 1) * 10 - 11];
|
|
}
|
|
}
|
|
/* Copy input speech, scale to sign+12 bit integers */
|
|
/* Remove long term DC bias. */
|
|
/* If the average value in the frame was over 1/4096 (after current
|
|
*/
|
|
/* BIAS correction), then subtract that much more from samples in */
|
|
/* next frame. If the average value in the frame was under */
|
|
/* -1/4096, add 1/4096 more to samples in next frame. In all other
|
|
*/
|
|
/* cases, keep BIAS the same. */
|
|
temp = 0.f;
|
|
i__1 = contrl_1.lframe;
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
|
inbuf[720 - contrl_1.lframe + i__ - 181] = speech[i__] * 4096.f -
|
|
(*bias);
|
|
temp += inbuf[720 - contrl_1.lframe + i__ - 181];
|
|
}
|
|
if (temp > (real) contrl_1.lframe) {
|
|
*bias += 1;
|
|
}
|
|
if (temp < (real) (-contrl_1.lframe)) {
|
|
*bias += -1;
|
|
}
|
|
/* Place Voicing Window */
|
|
i__ = 721 - contrl_1.lframe;
|
|
preemp_(&inbuf[i__ - 181], &pebuf[i__ - 181], &contrl_1.lframe, &precoef,
|
|
zpre);
|
|
onset_(pebuf, osbuf, osptr, &c__10, &c__181, &c__720, &contrl_1.lframe, st);
|
|
|
|
/* MAXOSP is just a debugging variable. */
|
|
|
|
/* MAXOSP = MAX( MAXOSP, OSPTR ) */
|
|
|
|
placev_(osbuf, osptr, &c__10, &obound[2], vwin, &c__3, &contrl_1.lframe,
|
|
&c__90, &c__156, &c__307, &c__462);
|
|
/* The Pitch Extraction algorithm estimates the pitch for a frame
|
|
*/
|
|
/* of speech by locating the minimum of the average magnitude difference
|
|
*/
|
|
/* function (AMDF). The AMDF operates on low-pass, inverse filtered */
|
|
/* speech. (The low-pass filter is an 800 Hz, 19 tap, equiripple, FIR
|
|
*/
|
|
/* filter and the inverse filter is a 2nd-order LPC filter.) The pitch
|
|
*/
|
|
/* estimate is later refined by dynamic programming (DYPTRK). However,
|
|
*/
|
|
/* since some of DYPTRK's parameters are a function of the voicing */
|
|
/* decisions, a voicing decision must precede the final pitch estimation.
|
|
*/
|
|
/* See subroutines LPFILT, IVFILT, and TBDM. */
|
|
/* LPFILT reads indices LBUFH-LFRAME-29 = 511 through LBUFH = 720 */
|
|
/* of INBUF, and writes indices LBUFH+1-LFRAME = 541 through LBUFH
|
|
*/
|
|
/* = 720 of LPBUF. */
|
|
lpfilt_(&inbuf[228], &lpbuf[384], &c__312, &contrl_1.lframe);
|
|
/* IVFILT reads indices (PWINH-LFRAME-7) = 353 through PWINH = 540
|
|
*/
|
|
/* of LPBUF, and writes indices (PWINH-LFRAME+1) = 361 through */
|
|
/* PWINH = 540 of IVBUF. */
|
|
ivfilt_(&lpbuf[204], ivbuf, &c__312, &contrl_1.lframe, ivrc);
|
|
/* TBDM reads indices PWINL = 229 through */
|
|
/* (PWINL-1)+MAXWIN+(TAU(LTAU)-TAU(1))/2 = 452 of IVBUF, and writes
|
|
*/
|
|
/* indices 1 through LTAU = 60 of AMDF. */
|
|
tbdm_(ivbuf, &c__156, tau, &c__60, amdf, &minptr, &maxptr, &mintau);
|
|
/* Voicing decisions are made for each half frame of input speech.
|
|
*/
|
|
/* An initial voicing classification is made for each half of the */
|
|
/* analysis frame, and the voicing decisions for the present frame */
|
|
/* are finalized. See subroutine VOICIN. */
|
|
/* The voicing detector (VOICIN) classifies the input signal as */
|
|
/* unvoiced (including silence) or voiced using the AMDF windowed */
|
|
/* maximum-to-minimum ratio, the zero crossing rate, energy measures, */
|
|
/* reflection coefficients, and prediction gains. */
|
|
/* The pitch and voicing rules apply smoothing and isolated */
|
|
/* corrections to the pitch and voicing estimates and, in the process,
|
|
*/
|
|
/* introduce two frames of delay into the corrected pitch estimates and
|
|
*/
|
|
/* voicing decisions. */
|
|
for (half = 1; half <= 2; ++half) {
|
|
voicin_(&vwin[4], inbuf, lpbuf, buflim, &half, &amdf[minptr - 1], &
|
|
amdf[maxptr - 1], &mintau, ivrc, obound, voibuf, &c__3, st);
|
|
}
|
|
/* Find the minimum cost pitch decision over several frames */
|
|
/* given the current voicing decision and the AMDF array */
|
|
dyptrk_(amdf, &c__60, &minptr, &voibuf[7], pitch, &midx, st);
|
|
ipitch = tau[midx - 1];
|
|
/* Place spectrum analysis and energy windows */
|
|
placea_(&ipitch, voibuf, &obound[2], &c__3, vwin, awin, ewin, &
|
|
contrl_1.lframe, &c__156);
|
|
/* Remove short term DC bias over the analysis window, Put result in ABUF
|
|
*/
|
|
lanal = awin[5] + 1 - awin[4];
|
|
dcbias_(&lanal, &pebuf[awin[4] - 181], abuf);
|
|
/* ABUF(1:LANAL) is now defined. It is equal to */
|
|
/* PEBUF(AWIN(1,AF):AWIN(2,AF)) corrected for short term DC bias. */
|
|
/* Compute RMS over integer number of pitch periods within the */
|
|
/* analysis window. */
|
|
/* Note that in a hardware implementation this computation may be */
|
|
/* simplified by using diagonal elements of PHI computed by MLOAD. */
|
|
i__1 = ewin[5] - ewin[4] + 1;
|
|
energy_(&i__1, &abuf[ewin[4] - awin[4]], &rmsbuf[2]);
|
|
/* Matrix load and invert, check RC's for stability */
|
|
mload_(&contrl_1.order, &c__1, &lanal, abuf, phi, psi);
|
|
invert_(&contrl_1.order, phi, psi, &rcbuf[20]);
|
|
rcchk_(&contrl_1.order, &rcbuf[10], &rcbuf[20]);
|
|
/* Set return parameters */
|
|
voice[1] = voibuf[2];
|
|
voice[2] = voibuf[3];
|
|
*rms = rmsbuf[0];
|
|
i__1 = contrl_1.order;
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
|
rc[i__] = rcbuf[i__ - 1];
|
|
}
|
|
return 0;
|
|
} /* analys_ */
|