AMBE-2000™ Vocoder Chip

User’s Manual Version 3.0

page 28

Confidential Proprietary, Subject to Change

Table 5-F DTMF Codes for Digit Detect/ Generate

DTMF Code

DTMF Digit

0x80

1

0x84

2

0x88

3

0x81

4

0x85

5

0x89

6

0x82

7

0x86

8

0x8A

9

0x87

0

0x83

*

0x8B

#

0x8C

A

0x8D

B

0x8E

C

0x8F

D

0xff

deactivate

To deactivate the Digit Detect/Genetrate function, 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 bite (example: 0x03 = 3, 0x00 = 0, 0xC4 = -60).

5.2.9 Formatted Input : Word 11 Control Word 2

Table 5-G Control Word 2 Format

Control_Word 2 – 16-bits (See Table 1-F)

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

VAD

Unused

0

SL

EC

RIS

Rate Information Selector (RIS) :

Use these 2 bits to select which part(s) of the vocoder will be affected by the rate selection words.

Table 5-H Rate Information Selection Codes

value

Area Controlled

0x0

Encoder and Decoder

0x1

Encoder only

0x2

Decoder only

0x3

Neither Encoder nor Decoder