Download 4.6-E1

ARIB TR-B15
Version 4.6-E1
7.2.3 Allocation of an identification signal
An identification signal consists of 20 bits of information. This 20-bit data is divided into WORD0, WORD1,
WORD2, and CRCC. Each division reserves 2 bits, 4 bits, 8 bits, and 6bits, respectively.
See the following diagram for more detail. The value "0" (unused) should be assigned to a bit for which no
information is specified.
Bit
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Data
1)
WORD 0
WORD 1
WORD 2
CRCC
2 bits
4 bits
8 bits
6 bits
WORD0 Information about the aspect ratio
WORD 0
bit1
bit2
0
0
0
1
1
0
2)
Description
The aspect ratio is 4:3
The aspect ratio is 4:3. The signal is a letterbox signal.
The aspect ratio is 16:9
WORD 1 The header that describes the information stored in WORD2
WORD 1
bit3
bit4
bit5
bit6
0
0
0
0
1
1
1
1
Other combinations
3)
Description of the information stored in WORD2
CGMS-A information
No information is stored in WORD2
Undefined
WORD2 (bit 7,8,9, and 10)
If WORD1 (bit 3 to 6) is "0000", the CGMS-A information should be stored in bit 7 and 8 of WORD2.
The Analog Protection System value should be stored in bit 9 and 10 of WORD2.
b7
0
0
1
1
b8
0
1
0
1
CGMS-A
0, 0
0, 1
1, 0
1, 1
B9
0
0
1
b10
0
1
0
1
1
Analog Protection System value
The signal can be copied without restriction
Insertion of false synchronization pulses
Insertion of false synchronization pulses, and addition of 2-line color
stripes
Insertion of false synchronization pulses, and addition of 4-line color
stripes
―2-64―