AMBE-2000 Digital Voice Systems, Inc., AMBE-2000 Datasheet - Page 34

• Manufacturer Part Number: AMBE-2000
• Description: 2.0 - 9.6 KBPS Single ic For Toll-quality, Low Data Rate, Real Time Speech Compression
• Manufacturer: Digital Voice Systems, Inc.

If no tones are detected, the DTMF Code is set to 0xff. Dial, ring and busy tones are standard North American call progress
tones. An expanded list of tones and values can be found in the Appendices, Section 8.4.
DTMF Amplitude
The DTMF Amplitude runs from 3 to –60 dBm0. This value is a signed byte (example: 0x03 = 3, 0x00 = 0, 0xC4 = -60).
5.3.9
Rate Information Selector (RIS):
This field is used to indicate which part of the device is affected by words 2-6, the rate control words.
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Bit 15
Framed Output: Word 11 : Control Word 2
Table 5-N Control Word 2 Format
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14
Decoder Output Volume Control
13
Table 5-O Rate Information Selection Codes
12
DTMF Code
Table 5-M DTMF Codes for Digit Detect/ Generate
0x8A
0x8B
0x8C
0x8D
0x8E
0x80
0x84
0x88
0x81
0x85
0x89
0x82
0x86
0x87
0x83
0x8F
0x90
0x91
0x92
11
0xff
0x0
0x1
0x2
0x3
value
10
Control Word 2 – 16-bits (See Table 1-A)
AMBE-2000™ Vocoder Chip
User’s Manual Version 4.0
Encoder and Decoder
Encoder only
Decoder only
Neither Encoder nor Decoder
DTMF Digit
Busy Tone
Ring Tone
Dial Tone
No Tone
9
0
A
B
C
D
1
2
3
4
5
6
7
8
9
#
*
Area Controlled
8
Unused
Frequency 1
7
0
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633
(Hz)
440
480
620
N/A
Unused
0
6
Unused
5
0
Frequency 2
Unused
(Hz)
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
350
440
480
N/A
4
0
SL
3
EC
2
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1
RIS
0