Specifications

AMBE-3000™ Vocoder Chip Users Manual
Version 2.8, August, 2011
Dat
a and Configuration Packets
Table 41 PKT_COMPAND Response Field Format
PKT_RATET field (2 bytes total) specifies one of the built-in rates. Sets a built-in Rate from Table 115 Rate Index Numbers
PKT_RATET Field - Format
Field Identifier Control Field Data
1 Byte 1 Byte
0x09 Rate Index Value From Table 115 Rate Index Numbers
Table 42 PKT_RATET Field Format
PKT_RATET Response field (1 byte total) indicates receipt of a rate field.
PKT_RATET Response Field - Format
Field Identifier Response Field Data
1 Byte 0 Byte
0x09 No Data Needed
Table 43 PKT_RATET Response Field Format
The rate of the AMBE-3000™ Vocoder Chip can be set through hardware pins or control words. After resetting the device, the
coding rate can be modified for both the encoder and the decoder by sending a PKT_RATET or PKT_RATEP packet. Table
1
16 Rate Control Words and Pin Settings shows standard Rate / FEC combinations
Th
e AMBE-3000™ Vocoder Chip uses these six words to set the source and FEC coding rates. Table 115 Rate Index
Num
bers and Table 116 Rate Control Words and Pin Settings lists the predefined values for various source and FEC rates that
are
built into the AMBE-3000™ Vocoder Chip. These tables also indicate what rates are compatible with older DVSI vocoder
chips such as the AMBE-2000™ Vocoder Chip (using AMBE™+ technology) and the AMBE-1000™ Vocoder Chip (using
AMBE™ technology). These are a representation of the most commonly requested rates. Please contact DVSI for additional
rate information if the desired rates are not listed.
PKT_RATEP field (13 bytes total) Custom Rate words
If rates other than those indicated in Table 115 Rate Index Numbers and Settings are desired then the PKT_RATEP field must
be
used to specify a custom rate.
PKT_RATEP - Field Format
Field Identifier Control Fields Data
1 Byte Rate Control Words (6 Words)
0x0A RCW 0 RCW 1 RCW 2 RCW 3 RCW 4 RCW 5
Table 44 PKT_RATEP Field Format
Example of a PKT_RATEP field with the custom rate of 2800 bps voice and 0 bps FEC
Field Identifier RCW 0 RCW 1 RCW 2 RCW 3 RCW 4 RCW 5
0x0A 0x0038 0x0765 0x0000 0x0000 0x0000 0x0038
Table 45 PKT_RATEP Field Example
PKT_RATEP Response field (1 byte total) indicated receipt of custom rate words
(Subject to Change) Page 57
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