Features - Digital Voice Systems VC-20-MR2 User Manual

Section 6 – Advanced Features
DTMF_DAT
MSB...LSB
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
By default, the VC-20 AMBE is jumpered to use IRQ 11 and I/O ports 0x26c-0x26f.
page 16
Keypad Frequency
Character
1 1209 Hz.
4 1209 Hz.
7 1209 Hz.
* 1209 Hz.
2 1336 Hz.
5 1336 Hz.
8 1336 Hz.
0 1336 Hz.
3 1477 Hz.
6 1477 Hz.
9 1477 Hz.
# 1477 Hz.
A 1633 Hz.
B 1633 Hz.
C 1633 Hz.
D 1633 Hz.
Table 1: DTMF Tone Data
D V
IGITAL OICE
The Speech Compression Specialists
Frequency
#2 #1
697 Hz.
770 Hz.
852 Hz.
941 Hz.
697 Hz.
770 Hz.
852 Hz.
941 Hz.
697 Hz.
770 Hz.
852 Hz.
941 Hz.
697 Hz.
770 Hz.
852 Hz.
941 Hz.
VC-20 AMBE™ Vocoder Board User's Manual
S I
YSTEMS, NC.