Sony DNW-A100 Maintenance Manual page 129

External Input
Analog or digital video and audio input signals are con-
verted into parallel video data and serial audio data,
respectively. (Refer to Fig. A-4-2.)
Recording on the Tape (Betacam SX Format)
Codes are added to the compressed video data and record-
ing-level processed audio data for error correction using an
ECC encoder.
The video data and audio data are rearranged in the
recording format of the tape so as to add error correction
codes (Reed-Solomon product codes). At this time, the
shuffling is performed simultaneously. After that, outer
ECC data, sync data, ID data, and inner ECC data are
added sequentially. Lastly, channel-coded recording serial
data is sent to the head and recorded on the tape. The
video data and audio data recorded on the tape are gathered
together for each GOP (1GOP is two frames) that is a
compression unit of video data. The video data and audio
data of 1GOP consist of ten tracks (525/60 system) or 12
tracks (625/50 system) on the tape. An error occurring
during playback is corrected in this range. Therefore, a
higher error correction function can be obtained.
(Refer to Fig. A-4-2.)
Input
Video
Video
Input
Interface
(Analog)
Input
Audio
Audio
Input
Interface
(Analog)
V
SDI SDI
Input Interface
A
DNW-A100/A50P/A45
DNW-A100P/A50P/A45P
MPEG2 4:2:2P@ML
Corder
(Bit Reduction)
V
Audio Process
A
SDDI
Interface
Betacam/Betacam SP PB
Fig. A-4-2
V
ECC Record
A
Encorder Driver
SCSI
Interface
SDI
Interface
MPEG2 Video
V
4:2:2P@ML Output
Decorder Process
Interface
Audio
A
Output
Process
Interface
A-4. Signal Processing
Rec.
Tape
Head
(Betacam SX)
SDDI Output
HDD
SCSI Interface
SDI Interface
Video Output
Audio Output
Input Video/Audio
Process Interface
A-7