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One block of main data area (PCM area) is grouped into Synchronous signal, Main 1D and Main data. W1
and W2 in the Main ID consists of the ID format as shown in Fig. 4.
Main ID
Main ID
Main data (8x32=256 bits)
Synchronous signal
Parity
8 bits
8 bits
MSB LSB
1 main data block = 8+8+8+8+8-x
32 = 288 data bits
Figure 3 Block Format for Main Data
W1 (Sub-code for main data)
W2 (Main data block address)
B7 | Be | Bs]
B4 | B3 | B2 | B1 | Bo | B7 | Be
B2|
Bi] Bo
0
0
i
7
Not fixed
Not fixed
| 0 |
ID2
IDs
| _Frameaddress_—
|__|
Not fixed
Lo |
ID4
IDs
| ___Frameaddress__—|_o |
Not fixed
0 |
0s]
| oo
Figure 4 Main ID Format
The copy information is recorded at the upper 2 bits of W1 in the main ID. —
Play signal
Inconventional system, there are
two types for recording of Free
copy "00" and No copy "10".
SCMS system has one more type
"1 4" which makes one phase copy
possible.
ID6 in
the tape
Copy mode
Copy
informations
11
DAT-P
OK
Only one phase copy possible
Category ©
Fig. 4 Relational table of ID and Play signal copy during digital copy.
For example, the "11" is recorded in 1D6 when DAT records the analog signal from FM tuner or Cassette
player. When playing this tape, the logic reads the "11" information in the ID6, and outputs the copy
prohibit code to the digital audio interface. In SCMS system, when receiving the category code of the DAT
music tape, copy is made even if the copy prohibit exists, and the "10" is recorded in ID6.
CATEGORY
|
CATEGORY CODE
General
cD
410000000
PCM Processor
01000000
If copy is tried on this tape, the logic reads "10"
in |D6, and outputs the copy prohibit code to the
digital audio interface as the category code is
DAT "11000000".
DAT Music Tape
11000001
Main Category Code
prohibit.
51
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