1.HDV format
HDV is a video format
designed to enable the
recording of high definition
MPEG-2 video on standard
DV media (DV or MiniDV
cassette tape). The HDV
format was defined by four
companies: Canon Inc., Sharp Corporation, Sony Corporation,
and Victor Company of Japan, Limited (JVC). The specification
of the HDV format incorporates two versions, one progressive
(720p) and the other interlaced (1080i). HDV uses the same
track pitch and tape speed as the DV format, and therefore the
recording times are the same duration as the DV format.
2.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.
HDV and DV compatibility
The HDV format 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.
Progressive HDV-compatible support
To maximize picture quality and performance from input to
output, JVC employs the HDV 720 progressive system.
Progressive HDV’s resolution of 1280 x 720 is the same as the
native resolution of most HD display devices in use today
(LCD, plasma, DLP, D-ILA). HDV 720p is thus natively
compatible in terms of both resolution and scanning system.
3. 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.
4.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 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.
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.
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Advantages of ProHD
The GY-HD250, fitted
with Mini 35 film
adapter from P & S
Technik, becomes an
ideal digital film camera
