AMBE-2000™ Vocoder Chip Users Manual
Version 4.92, June, 08
DVSI Confidential Proprietary, Subject to Change Page 31
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Table 5-E DTMF Control Format
DTMF Control – 16-bits
15:
MSB
14 13 12 11 10 9 8 7 6 5 4 3 2 1
0:
LSB
DTMF Amplitude DTMF Digit Detect/ Generate
Table 5-F 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 Inactive N/A N/A
To generate no tones, set the DTMF Code to 0xff. Dial, ring, and busy tones are standard North American call progress tones.
DTMF Amplitude
The DTMF Amplitude runs from 3 to –60 dBm0. This value is a signed byte (example: 0x03 = 3, 0x00 = 0, 0xC4 = -60).
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