Digital Voice Systems Net-2000-P25, Руководство пользователя

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Net-2000™ Voice Codec Unit
User’s Manual
Page 22
DVSI Confidential Proprietary
Section 4 – Net-2000™ VCU Interface Protocol
Valid range for tone.amp is: +3 to -90 (signed twos complement integer, units are dBm0)
tone.amp = tone amplitude
Description
Byte 20
7 6 5 4 3 2 1 0
Byte 21
7 6 5 4 3 2 1 0
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 1 1 1 1 1 1 1 1 0 1 0 0 1 1 0 -90
Table 15 tone.amp Parameter
ws
The ws element of the packet contains the number of samples that should be synthesized by the
decoder when transmitted to the VCU and the number of samples that were used to encode the
channel data when transmitted by the VCU. Appropriate values for ws are listed in Table 10.
Ws = Number of voice samples.
Description
Byte 22
7 6 5 4 3 2 1 0
Byte 23
7 6 5 4 3 2 1 0
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 16 ws Parameter
format
Format include 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 8
(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 11.
format = Soft decision & voice data
Voice Data Formats
Byte 24
7 6 5 4 3 2 1 0
Byte 25
7 6 5 4 3 2 1 0
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 24
7 6 5 4 3 2 1 0
Byte 25
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
5 0 0 0 0 0 1 0 1 0 0 0 x 0 0 x x 0x05XX
6 0 0 0 0 0 1 1 0 0 0 0 x 0 0 x x 0x06XX
7 0 0 0 0 0 1 1 1 0 0 0 x 0 0 x x 0x07XX
8 0 0 0 0 1 0 0 0 0 0 0 x 0 0 x x 0x08XX
Table 17 format Parameters