?? sc1200.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. */
/* */
/* ================================================================== */
/*------------------------------------------------------------------*/
/* */
/* File: sc1200.h */
/* */
/* Description: globle include file for sc1200 coder */
/* */
/*------------------------------------------------------------------*/
#ifndef _SC1200_H_
#define _SC1200_H_
/* =================== */
/* Definition of Types */
/* =================== */
typedef long int Longword; /* 32 bit "accumulator" (L_*) */
typedef short int Shortword; /* 16 bit "register" (sw*) */
typedef short int ShortwordRom; /* 16 bit ROM data (sr*) */
typedef long int LongwordRom; /* 32 bit ROM data (L_r*) */
typedef unsigned short UShortword; /* 16 bit unsigned data */
typedef unsigned long ULongword; /* 32 bit unsigned data */
typedef double Word40; /* 40 bit "accumulator" */
/* ================== */
/* General Definition */
/* ================== */
#define BOOLEAN Shortword
#define TRUE 1
#define FALSE 0
#define ON 1
#define OFF 0
#ifndef PI
#define PI 3.141592654
#endif
/* ================= */
/* Software switches */
/* ================= */
#define ANA_SYN 0
#define ANALYSIS 1
#define SYNTHESIS 2
#define UP_TRANS 3
#define DOWN_TRANS 4
#define RATE2400 2400
#define RATE1200 1200
#define SKIP_CHANNEL FALSE
#define POSTFILTER TRUE
#define NPP TRUE
#define NEW_DC_FILTER TRUE
/* ================================================================ *
* Global Constants *
* ================================================================ */
#define FSAMP 8000 /* sampling frequency */
#define FRAME 180 /* speech frame size */
#define NF 3 /* number of frames in one block */
#define BLOCK (NF*FRAME)
#define FFTLENGTH 512
#define LOOKAHEAD (FRAME + 110)
/* -------- Pitch analysis -------- */
#define PITCHMIN 20 /* minimum pitch lag */
#define PITCHMAX 160 /* maximum pitch lag */
#define PITCHMAX_Q7 20480 /* PITCHMAX * (1 << 7) */
#define PITCHMIN_Q7 2560 /* PITCHMIN * (1 << 7) */
#define MINPITCH 20 /* new minimum pitch */
#define MAXPITCH 147 /* new maximum pitch */
#define LOG_UV_PITCH_Q12 6963 /* 1.7 * (1 << 12) */
#define NODE 8
#define NUM_PITCHES 2
#define PIT_COR_LEN 220
#define PIT_SUBNUM 2
#define PIT_SUBFRAME (FRAME/PIT_SUBNUM) /* 90 */
/* -------- Voicing analysis -------- */
/* In this coder, classy being TRANSITION is processed in the same way as */
/* those classy being VOICED. */
#define VOICED 0 /* new voicing modes */
#define UNVOICED 1 /* compatitable with MELP uv_flag */
#define TRANSITION VOICED /* here it is plosive in unvoiced */
#define SILENCE 3 /* silence is encoded same as uv */
#define NUM_BANDS 5 /* number of frequency bands */
#define MINLENGTH 160 /* minimum correlation length */
#define EN_FILTER_ORDER 17
/* -------- Buffer Structure -------- */
#define FRAME_BEG (PITCHMAX - (FRAME/2)) /* 70 */
#define FRAME_END (PITCHMAX + (FRAME/2)) /* 250 */
#define PITCH_BEG (FRAME/2) /* 90 */
#define PITCH_FR (2*PITCHMAX + 1) /* 321 */
#define IN_BEG (PITCH_BEG + PITCHMAX + PIT_COR_LEN/2) /* 360 */
#define OLD_IN_BEG (PITCH_BEG + PITCH_FR - FRAME) /* 231 */
/* -------- LPC analysis -------- */
#define LPC_FRAME 200 /* LPC window size */
#define LPC_ORD 10 /* LPC order */
#define NUM_HARM 10 /* number of Fourier magnitudes */
#define NUM_GAINFR 2 /* number of gains per frame */
#define PITCHMAX_X2 (PITCHMAX*2) /* maximum pitch lag times 2 */
#define LPF_ORD 6 /* lowpass filter order */
#if NEW_DC_FILTER
#define DC_ORD 6
#else
#define DC_ORD 4 /* DC removal filter order */
#endif
#define BPF_ORD 6 /* bandpass analysis filter order */
#define ENV_ORD 2 /* bandpass envelope filter order */
#define MIX_ORD 32 /* mixed excitation filtering order */
#define DISP_ORD 64 /* pulse dispersion filter order */
#define DEFAULT_PITCH_Q7 6400 /* default pitch value */
/* DEFAULT_PITCH * (1 << 7) */
#define UV_PITCH 50 /* unvoiced pitch value */
#define UV_PITCH_Q7 6400 /* UV_PITCH * (1 << 7) */
#define VMIN_Q14 13107 /* 0.8 * (1 << 14) minimum strongly */
/* voiced correlation */
#define VJIT_Q14 8192 /* 0.5 * (1 << 14) jitter threshold */
/* for correlations */
#define BPTHRESH_Q14 9830 /* 0.6 * (1 << 14) bandpass voicing */
/* threshold */
#define MAX_JITTER_Q15 8192 /* 0.25 * (1 << 15) maximum jitter */
/* (as a fraction) */
#define ASE_NUM_BW_Q15 16384 /* 0.5 * (1 << 15) adaptive */
/* spectral enhancement-numer */
#define ASE_DEN_BW_Q15 26214 /* 0.8 * (1 << 15) adaptive spectral */
/* enhancement-denom */
#define GAINFR (FRAME/NUM_GAINFR) /* size of gain frame */
#define MIN_GAINFR 120 /* minimum gain analysis window */
#define GAIN_PITCH_Q7 15257 /* (1.33*GAINFR - 0.5) * (1 <<7 ) pitch */
/* input for gain_ana */
#define MSVQ_M 8 /* M-best for MSVQ search */
#define MSVQ_MAXCNT 256 /* maximum inner loop counter for MSVQ search */
/* Correct value should be 409 but 0 was used during listening test. */
/* Set to 0 for bit exact results for the test materials */
#if (0)
#define BWMIN_Q15 0 /* (50*2/FSAMP) * (1 << 15) minimum */
/* LSF separation */
#else
#define BWMIN_Q15 409
#endif
/* ======================================= */
/* Noise suppression/estimation parameters */
/* Up by 3 dB/sec (0.5*22.5 ms frame), */
/* down by 12 dB/sec */
/* ======================================= */
#define UPCONST_Q19 17691 /* 0.0337435 * (1 << 19) noise estimation */
/* up time const */
#define DOWNCONST_Q17 -17749 /* -0.135418 * (1 << 17) noise estimation */
/* dn time const */
#define NFACT_Q8 768 /* 3.0 * (1 << 8) noise floor boost in dB */
#define MAX_NS_ATT_Q8 1536 /* 6.0 * (1 << 8) maximum noise suppression */
#define MAX_NS_SUP_Q8 5120 /* 20.0 * (1 << 8) max noise level to use */
/* in suppression */
#define MIN_NOISE_Q8 2560 /* 10.0 * (1 << 8) min value allowed */
/* in noise estimation */
#define MAX_NOISE_Q8 20480 /* 80.0 * (1 << 8) max value allowed */
/* in noise estimation */
/* ===================== */
/* Channel I/O constants */
/* ===================== */
#define CHWORDSIZE 8 /* number of bits per channel word */
#define ERASE_MASK (UShortword) 0x4000 /* erasure flag mask */
/* for channel word */
#define GN_QLO_Q8 2560 /* 10.0 * (1 << 8) minimum gain in dB */
#define GN_QUP_Q8 19712 /* 77.0 * (1 << 8) maximum gain in dB */
#define GN_QLEV 32
#define GN_QLEV_M1 (32 - 1) /* no. of 2nd gain quantization levels */
#define GN_QLEV_M1_Q10 31744 /* GN_QLEV_M1 * (1 << 10) GN_QLEV_M1 in Q10 */
#define PIT_BITS 7 /* number of bits for pitch coding */
#define PIT_QLEV 99 /* number of pitch levels minus 1 */
#define PIT_QLEV_M1 (99 - 1) /* number of pitch levels minus 1 */
#define PIT_QLEV_M1_Q8 25088 /* (PIT_QLEV_M1*(1<<8)) number of */
/* pitch levels minus 1 */
#define PIT_QLO_Q12 5329 /* 1.30103 * (1 << 12) minimum log */
/* pitch for quantization */
#define PIT_QUP_Q12 9028 /* 2.20412 * (1 << 12) maximum log */
/* pitch for quantization */
#define FS_BITS 8 /* number of bits for Fourier magnitudes */
#define FS_LEVELS (1 << FS_BITS) /* number of levels for */
/* Fourier magnitudes */
#define CHSIZE 27 /* The shortest integer number of */
/* words in channel packet; NF*9 */
#define NUM_CH_BITS 81 /* the size is determined for 1.2kbps */
/* ===================== */
/* 1200 bps Quantization */
/* ===================== */
#define UV_BITS 3
#define DELTA_PITCH_WEIGHT_Q0 1 /* 1.0 * (1 << 0) */
#define PITCH_VQ_CAND 16
#define PITCH_VQ_BITS 9
#define PITCH_VQ_SIZE (1 << PITCH_VQ_BITS)
#define PITCH_VQ_LEVEL_VVV (4 * PITCH_VQ_SIZE)
#define PITCH_VQ_LEVEL_UVV PITCH_VQ_SIZE /* This also includes VUV */
#define PITCH_VQ_LEVEL_VUV PITCH_VQ_SIZE /* and VVU cases. */
#define PITCH_VQ_LEVEL_VVU PITCH_VQ_SIZE
#define GAIN_VQ_BITS 10
#define GAIN_VQ_SIZE (1 << GAIN_VQ_BITS)
#define MAX_LSF_STAGE 4 /* We use 4 for VOICED frames */
/* and 1 for UNVOICED frames. */
#define LSP_VQ_CAND 8
#define LSP_VQ_STAGES 4
#define INVALID_BPVC 0001
/* ================== */
/* Harmonic Synthesis */
/* ================== */
#define SYN_SUBFRAME 45
#define SYN_SUBNUM (FRAME/SYN_SUBFRAME)
/* ===================== */
/* Structure definitions */
/* ===================== */
struct melp_param { /* MELP parameters */
Shortword pitch; /* Q7 */
Shortword lsf[LPC_ORD]; /* Q15 */
Shortword gain[NUM_GAINFR]; /* Q8 */
Shortword jitter; /* Q15 */
Shortword bpvc[NUM_BANDS]; /* Q14 */
BOOLEAN uv_flag;
Shortword fs_mag[NUM_HARM]; /* Q13 */
};
#define MSVQ_STAGES 4
struct quant_param {
Shortword pitch_index; /* quantized index of parameters */
Shortword lsf_index[NF][MAX_LSF_STAGE];
Shortword gain_index[NUM_GAINFR];
Shortword jit_index[NF]; /* Suspected that a scalar is good enough */
Shortword bpvc_index[NF];
Shortword fs_index;
BOOLEAN uv_flag[NF]; /* global uv decision */
Shortword msvq_index[MSVQ_STAGES];
Shortword fsvq_index;
unsigned char *chptr; /* channel related parameters */
Shortword chbit; /* they are rate dependent */
};
void analysis(Shortword sp_in[], struct melp_param *par);
void sc_ana(struct melp_param *par);
void synthesis(struct melp_param *par, Shortword sp_out[]);
void melp_ana_init();
void melp_syn_init();
void melp_chn_write(struct quant_param *qpar, unsigned char chbuf[]);
void low_rate_chn_write(struct quant_param *qpar);
BOOLEAN melp_chn_read(struct quant_param *qpar, struct melp_param *par,
struct melp_param *prev_par, unsigned char chbuf[]);
BOOLEAN low_rate_chn_read(struct quant_param *qpar, struct melp_param *par,
struct melp_param *prev_par);
void fec_code(struct quant_param *par);
Shortword fec_decode(struct quant_param *par, Shortword erase);
#endif
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