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G3 FACSIMILE COMMUNICATIONS
By being coded, these 2-bit coded data Y1n and Y2n are appended a 1-bit
redundant bit, and are output as 3-bit coded data Y0n, Y1n and Y2n. The
3-bit output coded data is mapped systematically on the signal spatial dia-
gram as shown in Fig. 5-54 together with send data Q3n, Q4n, Q5n and
Q6n that are not coded by the mapping circuit. In other words, the coding
ratio is 6/7 as the trellis coder in Fig. 5-53 outputs seven bits of coded data
on six bits of input data.
5–64
Table 5-11 Differential Coding in V.17
Input
Q
Q
1n
2n
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
Advance Input
Y
Y
1n-1
2n-1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
Output
Y
Y
1n
2n
0
0
0
1
1
0
1
1
0
1
0
0
1
1
1
0
1
0
1
1
0
1
0
0
1
1
1
0
0
0
0
1
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