**************************************************************
*   (C) COPYRIGHT TEXAS INSTRUMENTS, INC. 1996               *
**************************************************************
*   Program Name:     DTMF codec                             *
*   File Name:        tables.inc                             *
*   File Description: tables for dtmfsub.asm                 *
*                                                            *
*   Author:   Gunter Schmer                                  *
*   Date:     03/24/97                                       *
*   Revision: 3.0                                            *
*   Latest working date: 03/24/97                            *
**************************************************************



***************************************
***   Decoder Constants
***************************************
N		.set	102			;max count for DFT loops

THR_SIG1	.set	1900*32768/10000	;threshold for possible tone
THR_SIG2	.set	2150*32768/10000	;threshold for definite tone
THR_PAU		.set	458*32768/10000		;threshold for pause energy
THR_STDTWI	.set	2512*32768/10000	;threshold for standard twist (-5dB)
THR_REVTWI	.set	1259*32768/10000	;threshold for reverse twist (-9dB)
THR_ROWREL	.set	2000*32768/10000	;threshold for row's relative peak ratio
THR_ROW2nd	.set	2000*32768/10000	;threshold for row's 2nd harmonic ratio 
THR_COLREL	.set	2000*32768/10000	;threshold for col's relative peak ratio
THR_COL2nd	.set	2000*32768/10000	;threshold for col's 2nd harmonic ratio

sqrt_iterations .set 16		;iterations for sqrt in gain control function


	.sect	"tables"

***************************************
***   Decoder Tables
***************************************

*******************************************************
* The following table holds the coefficients for      *
* the 16 Goertzel filters, computed as follows        *
*                                                     *
*       .word    cos(2pi*k/N)*32768	;coefficient  *
*                                                     *
* with  N = 102  (1st and 2nd Harmonics)              *
*       k =  9, 10, 11, 12, 15, 17, 19, 21  (1. Harm) *
*       k = 18, 20, 22, 24, 31, 34, 38, 42  (2. Harm) *
*                                                     *
*******************************************************
COEF1st	.word	27980		; 1st Harmonics
	.word	26956
	.word	25701
	.word	24219
	.word	19073
	.word	16325
	.word	13085
	.word	9315

COEF2nd	.word	14739		; 2nd Harmonics
	.word	11414
	.word	7549
	.word	3032
	.word	-10565
	.word	-16503
	.word	-22318
	.word	-27472


*****************************************************************
* Digit mapping table                                           *
*   Low byte : row number                                       *
*   High byte: column number                                    * 
*****************************************************************
KEYS	.word	0301h		; '0'  
	.word	0000h		; '1'
	.word	0001h		; '2'
	.word	0002h		; '3'
	.word	0100h		; '4'
	.word	0101h		; '5'
	.word	0102h		; '6'
	.word	0200h		; '7'
	.word	0201h		; '8'
	.word	0202h		; '9'
	.word	0003h		; 'A'
	.word	0103h		; 'B'
	.word	0203h		; 'C'
	.word	0303h		; 'D'
	.word	0300h		; 'E' = '*'
	.word	0302h		; 'F' = '#'



***************************************
***   Encoder Tables
***************************************

*******************************************************
* The following table contains the coefficients for   *
* the difference equations of the digital sinusoidal  *
* oscillators.                                        *
*                                                     *
* In general:                                         *
*   DEQ:    y(n) = 2*cos(2pi*f/fs)*y(n-1) - y(n-2)    *
*   I.C.:   y(-1) = 0                                 *
*           y(-2) = -A*sin(2pi*f/fs)                  *
*   where   A  = desired amplitude of sine wave       *
*           f  = desired frequency of sine wave       *
*           fs = sampling frequency                   *
*                                                     *
*******************************************************
COEFFS	.word	27980		;row 1
	.word	26956		;row 2
	.word	25701		;row 3
	.word	24219		;row 4
	.word	19073		;col 1
	.word	16325		;col 2
	.word	13085		;col 3
	.word	9315		;col 4

*******************************************************
* The following table contains a generic set of       *
* initial conditions for the difference equations of  *
* the digital sinusoidal oscillators.                 *
* This table is used for initialization of the        *
* osci-table of each channel                          *
*                                                     *
* In general:                                         *
*   DEQ:    y(n) = 2*cos(2pi*f/fs)*y(n-1) - y(n-2)    *
*   I.C.:   y(-1) = 0                                 *
*           y(-2) = -A*sin(2pi*f/fs)                  *
*   where   A  = desired amplitude of sine wave       *
*           f  = desired frequency of sine wave       *
*           fs = sampling frequency                   *
*                                                     *
*******************************************************
OSCIS	.word	0          		;row1	y(n-1)
	.word	-1024*5204/10000	;	y(n-2)
	.word	0			;row2	y(n-1)
	.word	-1024*5686/10000	;	y(n-2)
	.word	0			;row3	y(n-1)
	.word	-1024*6203/10000	;	y(n-2)
	.word	0			;row4	y(n-1)
	.word	-1024*6736/10000	;	y(n-2)
	.word	0			;col1	y(n-1)
	.word	-1024*8132/10000	;	y(n-2)
	.word	0			;col2	y(n-1)
	.word	-1024*8671/10000	;	y(n-2)
	.word	0			;col3	y(n-1)
	.word	-1024*9168/10000	;	y(n-2)
	.word	0			;col4	y(n-1)
	.word	-1024*9587/10000	;	y(n-2)



****************************************************************
* Test Buffer for encoding results                             *
****************************************************************
;DATA	.sect	"buffer"	;length 32k words
;	.include "c:\mitel\test17.inc"