Specifications
Net-2000™ VCU Users Manual
Version 4.0, December, 2013
Interface Protocol
tone.am
p
= tone am
p
litude
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Description
B
y
te 22 B
y
te 23
Decimal Value
Max Amplitude 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 +3
… … … …
Zero Amplitude 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
… … … …
Min. Amplitude 1 0 0 0 0 0 0 0 0 1 0 1 1 0 1 0 -90
Valid range: +3 to -90 (signed twos complement integer, units are dBm0)
Table 26 tone.amp Parameter
6.3.2.10 Channel Data Packet Bytes 24 & 25 (ws)
The ws element of the packet contains the number of voice samples that should be synthesized by the decoder in a
Decoder Command Packet or the number of samples that were used to encode the channel data in a Channel
Response Packet. Appropriate values for ws are listed in Table 27 ws Parameter.
ws = Number of voice samples.
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Description
Byte 24 Byte 25
Decimal Value
0 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 159
0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 160
0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 1 161
Table 27 ws Parameter
6.3.2.11 Channel Data Packet Bytes 26 & 27 (format)
Soft Decision ONLY applies to the AMBE+™, AMBE+2™, GMR-1 and GMR-2+ Vocoders. Format includes both
the number of soft decision bits in the channel data and the format of the voice data to synthesize. This number of
soft decision bits should be between 1 (hard decision) and 4 (maximum soft decision capability). The number of
soft decision bits is determined by the top 8 bits of the format element.
(format >> 8) & 0x00ff
The format element of the channel packet also indicates the format of the voice data to be generated by the decoder.
Appropriate values for the number of soft decision bits and voice data type in the format element is listed in Table
28
format Parameter.
format = Soft decision & voice data
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Voice Data
Formats
Byte 26 Byte 27
Hex Value
Linear 16-bit PCM 0 0 0 0 x x x x 0 0 0 0 0 0 0 0 0xXX00
Soft-Decision Bits
Byte 26
7 6 5 4 3 2 1 0
Byte 27
7 6 5 4 3 2 1 0
Hex Value
1 0 0 0 0 0 0 0 1 0 0 0 x 0 0 x x 0x01XX
2 0 0 0 0 0 0 1 0 0 0 0 x 0 0 x x 0x02XX
3 0 0 0 0 0 0 1 1 0 0 0 x 0 0 x x 0x03XX
4 0 0 0 0 0 1 0 0 0 0 0 x 0 0 x x 0x04XX
Table 28 format Parameter
(Subject to Change) Page 48
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