AMBE2000 Datasheet, PDF (34/47 Pages) List of Unclassifed Manufacturers – VOCODER CHIP

AMBE-2000™ Vocoder Chip
User’s Manual Version 3.0
5.4.2 Unformatted Serial Input Format
The Unformatted Input format contains 1 to 4 bits within each 16 bits serial output word. For the formats which contain more
than one bit each word the MSB of the data bits is considered first in the transmission. In Unformatted mode, the header data
from Formatted mode is dropped and each 16 bit write contains 1 to 4 coded voice data bits. The number of words that need to
be transferred into the decoder for each 20 millisecond frame will be the number of bits per frame divided by the number of bits
per word. So a system coding at 4800 bps with 3 bits per word will need to write exactly 32 ( [4800 ÷50] ÷3 = 32) words each
frame.
Table 5-Q Unformatted Serial Input Data Format
Bits per Word
See Table 4-A
1 bit per Word Format
2 bits per Word Format
3 bits per Word Format
4 bits per Word Format
Data
Control Offset
Control Data
15
14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
D msb 0 0 0 0 0 0 X X X X X X X X X
D msb D 0 0 0 0 0 X X X X X X X X X
D msb D D 0 0 0 0 X X X X X X X X X
D msb D D D 0 0 0 X X X X X X X X X
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