EVS XT Series Technical Reference

XT Series DISK RECORDER - Technical Reference
EVS Broadcast Equipment SA - Nov 2005
Issue 3.0
11
Disks Size
NTSC
Compression + Bitrate 5x73GB 5x146GB 5x300GB 10x300GB
MJPEG / IMX 30 Mbps
18:33 37:15 76:41 153:30
MJPEG / IMX 40 Mbps
14:04 28:15 58:10 116:27
SD
MJPEG / IMX 50 Mbps
11:31 23:07 47:36 95:16
HD
MJPEG/MPEG 100 Mbps
8:19 16:42 34:22 68:49
- A special top cover plate is required to work with 2 disk trays (total 10 disks). This
brings the total height of the mainframe to 7RU.
- IMX and MPEG Compression are only available with Multicam 8 or later on XT[2]
Servers.
2.5.6 RAID LEVEL: 3
The Video Raid uses striping process across 5 disk drives. The video and
audio data is striped over the first 4 drives while the parity information is
saved on the fifth drive. If one drive is damaged, the Video Raid can use
the parity information to recover the missing information, so that operation
can continue seamlessly without bandwidth loss.
2.5.7 INTERPOLATION
The playing back of smooth slow motion pictures carries specific issues :
since some fields must be repeated at regular interval to provide the video
at the playback speed required by the operator, parity violation appears
regularly on the output video signal. This issue is specific to interlaced
formats (525i, 625i and 1080i) and does not concern progressive formats
(720p).
If O and E represent respectively the odd and even fields of a standard
video signal (50/60 Hz), we have:
The original video signal :
O E O E O E O E O E O E O E O E
The output video signal at 50% speed :
O O E E O O E E O O E E O O E E
The output video signal at 33% speed :
O O O E E E O O O E E E O O O E
The output video signal at 25% speed :
O O O O E E E E O O O O E E E E
Fields with parity violation are shown in bold, underlined letters. As it
appears from the above table, whatever the playback speed (with the
exception of the normal 100% playback speed), a number of fields violate
the normal parity of the output signal. This parity violation induces a 1-line
shift of the field, resulting in a vertical jitter of the picture. The jitter

EVS XT Series Specifications

General

Brand	EVS
Model	XT Series
Category	Computer Hardware
Language	English