Grass Valley PDR v.2.2 - Manual (Page 22)

Chapter 1 Introducing the Profile Family
4 Profile Family
A Profile System Overview
The PDR100 and PDR200 are multichannel digital disk recorders capable of
supporting up to four channels with motion JPEG compression. In a four-
channel Profile system, each channel can play back one video and four audio
signals while using several different video formats. In other words, one Profile
unit can replace up to four VTRs, with added benefit of random access to video
and audio data stored on disk.
The Profile system has an EISA motherboard with an internal digital video
routing system. There are sixteen EISA slots and one ISA slot used for interface
cards and routing audio data.
The applications processor subsystem, which runs the Windows NT operating
system, is based on an Intel Pentium 133 Mhz with 32 Mbytes of RAM. The
subsystem also has a hard disk drive and a 3.5-inch floppy disk drive, plus a
keyboard, mouse, and an SVGA card.
A video router chip set is integrated on the mother board. It routes video signals
between the video disk system, video effects cards, and video I/O cards. The
video router is a 32 x 32 crosspoint matrix capable of full bandwidth 4:2:2
CCIR 601 8-bit digital video. The video router allows real-time transfer of
video throughout the system without impacting overall system performance.
The video router also makes simultaneous record and playback possible on
separate channels.
Video Disk Subsystem
In the video disk subsystem, video data is compressed and written to disk, or
read from disk and decompressed. This video data is read from and written to
the video router in 8-bit, parallel component digital video format. The video
disk subsystem has disk recorder boards, a SCSI interface to the disks, and an
Intel i960 real-time processor.
The video disk subsystem uses master and slave disk recorder boards with two
SCSI channels on each board. The master disk recorder board comes standard
with a two-channel Profile unit, and a four-channel system adds a slave disk
recorder board. The master board has a Intel i960 real-time processor which
controls compression and the data flows on SCSI channels and CODECs.
A two-channel Profile has two JPEG CODECs and an i960 processor located
on the master disk recorder board. Bidirectional CODEC channels allow
channels to be configured for recording or playback. In a four-channel Profile
system, a slave disk recorder board adds two additional video disk recorder
channels and another SCSI-2 interface to support more disk drives.