bv32cnst.h

/*****************************************************************************/
/* BroadVoice(R)32 (BV32) Floating-Point ANSI-C Source Code */
/* Revision Date: October 5, 2012 */
/* Version 1.2 */
/*****************************************************************************/

/*****************************************************************************/
/* Copyright 2000-2012 Broadcom Corporation */
/* */
/* This software is provided under the GNU Lesser General Public License, */
/* version 2.1, as published by the Free Software Foundation ("LGPL"). */
/* This program is distributed in the hope that it will be useful, but */
/* WITHOUT ANY SUPPORT OR WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the LGPL for */
/* more details. A copy of the LGPL is available at */
/* http://www.broadcom.com/licenses/LGPLv2.1.php, */
/* or by writing to the Free Software Foundation, Inc., */
/* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*****************************************************************************/


/*****************************************************************************
 bv32cnst.h : BV32 constants

 $Log$
******************************************************************************/

#ifndef BV32CNST_H
#define BV32CNST_H

/* ----- Basic Codec Parameters ----- */
#define SF 16 /* input Sampling Frequency (in kHz) */
#define FRSZ 80 /* the FRame SiZe */
#define MAXPP 265 /* MAXimum Pitch Period */
#define MINPP 10 /* Half of MINimum Pitch Period */
#define NSF 2 /* number of subframes per frame */
#define PWSZ 240 /* Pitch analysis Window SiZe for 8 kHz lowband */
#define SFRSZ (FRSZ/NSF) /* SubFrame SiZe */
#define WINSZ 160 /* Half of lpc analysis WINdow SiZe */
#define MAXPP1 (MAXPP+1) /* Half of MAXimum Pitch Period + 1a */

/* NFC VQ coding parameters */
#define VDIM 4 /* excitation vector dimension */
#define CBSZ 32 /* codebook size */
#define PPCBSZ 32
#define LGPORDER 16 /* Log-Gain Predictor OODER */
#define LGPECBSZ 32 /* Log-Gain Prediction Error CodeBook SiZe */
#define LSPPORDER 8 /* LSP MA Predictor ORDER */
#define LSPECBSZ1 128 /* codebook size of 1st-stage LSP VQ */
#define SVD1 3 /* split VQ dimension 1 */
#define LSPECBSZ21 32 /* codebook size of 2nd-stage LSP split VQ */
#define SVD2 5 /* split VQ dimension 2 */
#define LSPECBSZ22 32 /* codebook size of 2nd stage LSP split VQ */

#define NVPSF (FRSZ/VDIM)
#define NVPSSF (SFRSZ/VDIM)

/* Packetloss Concealment */
#define ScPLCGmin 0.1f
#define ScPLCGmax 0.9f
#define PePLCGmin 0.5f
#define PePLCGmax 0.9f
#define ScPLCG_b ((ScPLCGmin-ScPLCGmax)/(PePLCGmax-PePLCGmin))
#define ScPLCG_a (ScPLCGmin-ScPLCG_b*PePLCGmax)
#define HoldPLCG 8
#define AttnPLCG 50
#define AttnFacPLCG (1.0f/(Float)AttnPLCG)

/* Pre-emphasis filter coefficients */
#define PEAPFC 0.75f
#define PEAZFC 0.5f

#define INVSFRSZ (1.0f/(Float)SFRSZ)
#define FECNSF 2 /* number of FEC subframes per frame */

#define Minlg -2.0f /* minimum log-gain */
#define TMinlg 0.25f /* minimum linear gain */
#define GPO 16 /* order of MA prediction */

/* Level Estimation */
#define estl_alpha (8191.0f/8192.0f)
#define estl_beta (1023.0f/1024.0f)
#define estl_beta1 (1.0f-estl_beta)
#define estl_a (511.0f/512.0f)
#define estl_a1 (1-estl_a)
#define estl_TH 0.2f

/* Log-Gain Limitation */
#define LGLB -24 /* Log-Gain Lower Bound */
#define GCLB -8 /* Log-Gain Change Lower Bound */
#define NGB 18 /* Number of Gain Bins */
#define NGCB 11 /* Number of Gain Change Bins */
#define MinE -2.0

#define PFO 1 /* preemphasis filter order */

#define LTMOFF MAXPP1 /* Long-Term filter Memory OFFset */

/* Parameters related to the gain decoder trap */
#define NCLGLIM_TRAPPED 50 /* 0.125 sec */
#define LEVEL_CONVERGENCE_TIME 100 /* 0.25 sec */

/* front-end highpass filter */
#define HPO 2 /* High-pass filter order */

/* lpc weighting filter */
#define LTWFL 0.5f

/* Minimum gain threshold */
#define TMinE (SFRSZ*0.25f)

/* coarse pitch search */
#define cpp_Qvalue 3
#define cpp_scale (1<<cpp_Qvalue)

/* ------ Decimation Parameters ----- */
#define DECF 8 /* DECimation Factor for coarse pitch period search */
#define FRSZD (FRSZ/DECF) /* FRame SiZe in DECF:1 lowband domain */
#define MAXPPD (MAXPP/DECF) /* MAX Pitch in DECF:1, if MAXPP!=4n, ceil() */
#define MINPPD ((int) (MINPP/DECF)) /* MINimum Pitch Period in DECF:1 */
#define PWSZD (PWSZ/DECF) /* Pitch ana. Window SiZe in DECF:1 domain */
#define DFO 4
#define MAXPPD1 (MAXPPD+1)
#define LXD (MAXPPD1+PWSZD)
#define XDOFF (LXD-FRSZD)
#define HMAXPPD (MAXPPD/2)
#define M1 (MINPPD-1)
#define M2 MAXPPD1
#define HDECF (DECF/2)
#define INVDECF (1.0F/(float)(DECF)) /* INVerse of DECF (decimation factor) */

/* coarse pitch */
#define MPTH4 0.3f /* value to use for MPTH[] with index >= 4 */
#define DEVTH 0.25f /* pitch period DEViation THreshold */
#define TH1 0.73f /* first threshold for cor*cor/energy */
#define TH2 0.4f /* second threshold for cor*cor/energy */
#define LPTH1 0.78f /* Last Pitch cor*cor/energy THreshold 1 */
#define LPTH2 0.43f /* Last Pitch cor*cor/energy THreshold 2 */
#define MPDTH 0.06f /* Multiple Pitch Deviation THreshold */
#define SMDTH 0.095f /* Sub-Multiple pitch Deviation THreshold */
#define SMDTH1 (1.0f-SMDTH)
#define SMDTH2 (1.0f+SMDTH)
#define MPR1 (1.0f-MPDTH) /* Multiple Pitch Range lower threshold */
#define MPR2 (1.0f+MPDTH) /* Multiple Pitch Range upper threshold */
#define MAX_NPEAKS 7

/* buffer offset and length */
#define XOFF MAXPP1 /* offset for x() frame */
#define LX (XOFF+FRSZ) /* Length of x() buffer */

#endif