AMBE2000 Datasheet, PDF (25/47 Pages) List of Unclassifed Manufacturers – VOCODER CHIP

AMBE-2000™ Vocoder Chip
User’s Manual Version 3.0
Figure 5-A Basic Formatted Input Format
Word #
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Description
Header always set to 0x13EC
Power Control (8bits)
Control Word 1 (8 bits) – see Table 5-B
Rate info 0
Rate info 1
Rate info 2
See Tables 5-C and 5-D
Rate info 3
Rate info 4
Unused in Input
Unused in Input
Unused in Input
DTMF Control – see Tables 5-E and 5-F
Control Word 2 – see Table 5-G
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
5.2.1 Formatted Input : Word 0 : Header
The decoder uses the header information to synchronize with the beginning of each 20 millisecond frame. this 16 bit word
MUST be 0x13EC.
5.2.2 Formatted Input : Word 1 : Power Control
Set the encoder to 0x00 in the 8-bit Power Control field of an output frame for normal use. For Power Down Mode, set this
value to 0x55. This causes the AMBE-2000 to enter low power mode. To exit low power mode, the device must be reset
through the hardware.
Table 5-A Formatted Input : ID Values Summary
ID
Type
Description
0x00
0x55
Voice Data
Low Power Mode
This ID value instructs AMBE-2000™ to operate in normal fashion
When this mode is activated the AMBE-2000™ Vocoder Chip will go into
a mode which conserves power, where no voice packets are being
processed.
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