User`s manual

AMBE-2000™ Vocoder Chip
User’s Manual Version 4.9
DVSI Confidential Proprietary, Subject to Change Page 35
Visit us at www.dvsinc.com
Table 5-M DTMF Codes for Digit Detect/ Generate
DTMF Code DTMF Digit Frequency 1
(Hz)
Frequency 2
(Hz)
0x80 1 1209 697
0x84 2 1336 697
0x88 3 1477 697
0x81 4 1209 770
0x85 5 1336 770
0x89 6 1477 770
0x82 7 1209 852
0x86 8 1336 852
0x8A 9 1477 852
0x87 0 1336 941
0x83 * 1209 941
0x8B # 1477 941
0x8C A 1633 697
0x8D B 1633 770
0x8E C 1633 852
0x8F D 1633 941
0x90 Dial Tone 440 350
0x91 Ring Tone 480 440
0x92 Busy Tone 620 480
0xff No Tone N/A N/A
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 Framed Output: Word 11 : Control Word 2
Table 5-N Control Word 2 Format
Control Word 2 – 16-bits
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Decoder Output Volume Control
Unused
0
Unused
0
Unused
0
Unused
0
SL EC RIS
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.
Table 5-O Rate Information Selection Codes
value Area Controlled
0x0 Encoder and Decoder
0x1 Encoder only
0x2 Decoder only
0x3 Neither Encoder nor Decoder
Echo Canceller (EC):
A 1 in this output field indicates that the echo canceller has been enabled.