ASAHI KASEI
[AK4115]
Burst Preambles in non-PCM Bitstreams
sub-frame of IEC958
0
3
4
7
8
11 12
LSB
27 28 29 30 31
MSB
preamble
Aux.
V U C P
16 bits of bitstream
0
15
Pa Pb Pc Pd
Burst_payload
stuffing
repetition time of the burst
Figure 50. Data structure in IEC60958
Preamble word
Length of field
16 bits
16 bits
16 bits
16 bits
Contents
Value
0xF872
0x4E1F
see Table 33
numbers of bits
Pa
Pb
Pc
Pd
sync word 1
sync word 2
Burst info
Length code
Table 32. Burst preamble words
Bits of Pc Value Contents
Repetition time of burst
in IEC60958 frames
0-4
data type
0
1
2
NULL data
Dolby AC-3 data
reserved
4096
1536
≤
3
PAUSE
4
5
6
7
8
9
10
11
12
13
14
15
MPEG-1 Layer1 data
MPEG-1 Layer2 or 3 data or MPEG-2 without extension
384
1152
1152
1024
384
MPEG-2 data with extension
MPEG-2 AAC ADTS
MPEG-2, Layer1 Low sample rate
MPEG-2, Layer2 or 3 Low sample rate
reserved
DTS type I
DTS type II
DTS type III
ATRAC
1152
512
1024
2048
512
ATRAC 2/ 3
1024
16-31 reserved
5, 6
7
0
0
1
reserved, shall be set to “0”
error-flag indicating a valid burst_payload
error-flag indicating that the burst_payload may contain
errors
8-12
data type dependent info
13-15
0
bit stream number, shall be set to “0”
Table 33. Fields of burst info Pc
MS0573-E-00
2006/12
- 59 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
