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npp.h
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npp.h
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/* ================================================================== */
/* */
/* Microsoft Speech coder ANSI-C Source Code */
/* SC1200 1200 bps speech coder */
/* Fixed Point Implementation Version 7.0 */
/* Copyright (C) 2000, Microsoft Corp. */
/* All rights reserved. */
/* */
/* ================================================================== */
#ifndef _NPP_H_
#define _NPP_H_
/*---------------------------------------------------------------------
* enfix.h - Speech Enhancement Functions
*
* Author: Rainer Martin, AT&T Labs-Research
*
* Last Update: $Id: enh_fun.h,v 1.1 1999/02/12 19:07:13 martinr Exp martinr $
*
*---------------------------------------------------------------------
*/
#include "sc1200.h"
#include "mathhalf.h"
#include "math_lib.h"
#include "mathdp31.h"
/********************* SWITCHES FOR COMPILATION ***************************/
/* Note: to reproduce the DAM and DRT evaluation results for versions nsa6 and
nsa7 the switches have to be set as follows:
#define USEDOUBLES
#define MINSTAT
#define WRITESHORT
#define NO_APPROX
These settings are also suitable for the latest version (nsa8).
*/
/* define precision: choice of USEDOUBLES or USEFLOATS */
#define USEDOUBLES
/* define the type of noise estimator to be used.
MINSTAT is the optimal smoothing minimum statistics estimator;
MALAH is David Malah's VAD based noise estimation method. */
#define MINSTAT /* choice of MALAH or MINSTAT */
/* define the file format for the enhanced speech: WRITEFLOAT writes the data
in the int16_t format which might be actually double or float, depending on
the USEDOUBLES/USEFLOATS switch. WRITESHORT writes 16 Bit short data. */
#define WRITESHORT /* choice of WRITESHORT or WRITEFLOAT */
/* select an approximation for the bias computation */
#define NO_APPROX /* choice of NO_APPROX and BIAS_APPROX_1 (linear approx.)
and BIAS_APPROX_2 (quadratic approx.).
If you try a new frame length and/or new frame shift
use NO_APPROX and switch later to BIAS_APPROX_2 */
/* ====== Parameters from Noise_Params_Minstat ====== */
#define WTR_FRONT_LEN 32 /* Q0 */
#define GM_MIN 3932 /* max value for Min. Gain Modif. Factor */
/* 0.12, Q15 */
#define NOISE_B_BY_NSMTH_B 181 /* bias factor for initial noise estimate */
/* sqrt(2), Q7 */
#define GAMMAX_THR 18102 /* gamma_max threshold */
/* 35.35533905932737, Q9 */
#define GAMMAV_THR 23170 /* gamma_av threshold */
/* sqrt(2), Q14 */
#define LEN_MINWIN 9 /* length of subwindow */
#define NUM_MINWIN 8 /* number of subwindows */
#define ALPHA_N_MAX 30802 /* maximum of time varying */
/* smoothing parameter, 0.94, Q15 */
#define PDECAY_NUM -10240 /* -0.3125, Q15 */
#define MINV 19543 /* parameter used to compute */
/* the minimum bias, 1.19283835953, Q14 */
#define MINV_SUB 13968 /* 1.7051077144138, Q13 */
#define MINV2 11656 /* 1.422863351963, Q13 */
#define MINV_SUB2 11909 /* 2.907392317753447, Q12 */
#define FVAR 16521 /* 8.066905819615, Q11 */
#define FVAR_SUB 18643 /* 1.13786305163652, Q14 */
/* ====== Parameters from Enhance_Params ====== */
#define USE_SYN_WINDOW TRUE /* switch on synthesis window */
#define ENH_WINLEN 256 /* frame length */
#define ENH_WIN_SHIFT FRAME /* frame advance suitable for MELP coder */
#define ENH_OVERLAP_LEN (ENH_WINLEN - ENH_WIN_SHIFT)
/* length of overlapping of adjacent frames, 76 */
#define ENH_VEC_LENF (ENH_WINLEN/2 + 1) /* length of spectrum vectors */
#define ENH_NOISE_FRAMES 1 /* number of initial look ahead frames */
#define ENH_NOISE_BIAS 23170 /* noise overestimation factor */
/* 1.5dB = sqrt(2), Q14 */
#define ENH_INV_NOISE_BIAS 23170 /* 1.0/ENH_NOISE_BIAS, Q15 */
#define ENH_ALPHA_LT 32023 /* smoothing constant for long term SNR */
/* 0.977273, Q15 */
#define ENH_BETA_LT 745 /* 0.022727, Q15 */
#define ENH_QK_MAX 32735 /* Max value for prob. of signal absence */
/* 0.999, Q15 */
#define ENH_QK_MIN 33 /* Min value for prob. of signal absence */
#define ENH_ALPHAK 30474 /* decision directed ksi weight */
/* 0.93, Q15 */
#define ENH_BETAK 18350 /* 0.07, Q18 */
#define ENH_GAMMAQ_THR 19273 /* 0.588154886, Q15 */
#define ENH_ALPHAQ 30597 /* Smoothing factor of hard-decision */
/* qk-value, 0.93375, Q15 */
#define ENH_BETAQ 2171 /* 0.06625, Q15 */
extern void npp(int16_t sp_in[], int16_t sp_out[]);
#endif