JVC GY-HD250 Brochure & Specs page 4

Advantages of ProHD
1.HD Progressive (720/60p) format for high
quality moving pictures and digital stills
Progressive scanning
JVC's ProHD products use the same progressive scanning
system used in high-end HDTV cameras. Because the GY-
HD250 uses a full-frame (60p) progressive scanning system, it
has the unique ability to capture and store full frames of image
information. An added bonus of progressive scanning is that it
is a very simple process to convert a progressive image to
interlaced, whereas the opposite is not the case. When
progressive recordings are paused or played
in slow motion, each individual frame
contains the full detail of the original image —
excellent for viewing and analyzing motion.
Stills and prints captured from HD
progressive video avoid the distortion
typically resulting from the combining of two
different frames of interlaced video. In
addition, today's flat panel television displays
and fixed matrix projectors, such as D-ILA,
DLP and LCD, are all native progressive
scanning systems. This means that JVC's
progressive HDV recordings can be displayed
without imperfection, because they do not
need to pass through the degenerative
process of de-interlacing prior to being
displayed.
DV compatibility
The GY-HD250 uses the same recording track pitch (10 µm) as
Professional DV, meaning that ProHD also offers track pitch
compatibility with the DV format and the same recording time.
This remarkable HD recording capability was achieved by
developing a new high-power MPEG codec system capable of
maintaining high-definition picture quality, while compressing
the data to 19.7 Mbps bit rate. With its superior resolution and
advanced processing, ProHD delivers top performance in both
its native 16:9 HD mode and in the SD mode. The facility to
make recordings in either HD or SD makes ProHD the ideal
choice for professionals not quite ready to
make the full transition
to HD.
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2. True 24p frame capture
24p Progressive Full HD images are ideal for cinematographic
applications. From shooting to editing and distribution, an HD
system can be established for film-like productions. Unlike 24p
images in standard definition, when real 24p HD video is
down-converted to SD, the result is truly film-like DVDs. The
camcorder itself, with its video lens removed and replaced by a
film lens converter system, such as the Mini 35 from P & S
Technik, effectively becomes a digital film camera.
The GY-HD250, fitted with Mini 35 film adapter from
P & S Technik, becomes an ideal digital film camera
3.JVC's dual recording system
The optional JVC Hard Disk Recorder DR-HD100 creates a
dual recording system of tape and hard disk. This system is
already utilized by Professional DV users the world over. The
many advantages inherent in JVC's dual recording system of
tape & hard disk drive are well appreciated. It was only natural
that JVC's range of ProHD models would include a Hard Disk
Drive recorder and one that can operate equally in DV and
HDV modes. The dual recording system provides fast and
efficient HDD-based editing and cost-effective
archiving, using low-cost tapes. Thanks
to the newly developed MPEG-2
encoding IC, high-quality pictures can
be recorded on readily available
The DR-HD100 can be mounted at
the rear of the camcorder, through the use of
an optional bracket which is offered by the leading
battery systems manufacturers.
compact DV cassettes, so
running costs are
minimized as no special
equipment or exclusive
media are required. The
DR-HD100 will also be
able to record in the
QuickTime .mov file
format enabling Direct-
To-Edit (DTE) capability
with compatible non-linear
editing systems.