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The advantages of ProHD
1. HDV format
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 length as the DV format.
2. HD Progressive (720p/60) 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-HD200 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, but not vice versa. 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 look far better than
from interlaced video. In any case, today's flat panel television
displays and fixed matrix projectors, such as D-ILA, DLP and
LCD, all utilize a 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, whilst 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,
either 16:9 or 4:3.
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 with
the vast majority of today's HD displays.
3. True 24 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.
3●
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
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 tape 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 minimal. As no special equipment or
exclusive media are required, the operating costs of the total system can
be kept low. The DR-HD100 is mounted at the rear of the camcorder,
utilizing an optional bracket which is provided by the leading battery
systems manufacturers.
Optimized picture quality from innovative
JVC technology within GY-HD200/250
Horizontal resolution and signal-to-noise ratio have been enhanced,
making the already high ProHD picture quality even better,. Together
with ProHD's superior color reproduction, these improvements
ensure true professional quality HD imaging.
a. 14-bit A/D converter
To improve both the S/N ratio and the horizontal resolution, a new
14-bit A/D converter was specially developed by JVC to prevent
signal deterioration and to generate a fourfold increase in
gradations.
b. Wideband front end processing
The ProHD camcorder uses a wideband analog front end to
process its CCD sampling via the 14-bit A/D converter. This further
improves the S/N ratio and horizontal resolution by optimizing the
CCD drive circuitry. The new LVDS (Low Voltage Differential Signal)
interface minimizes any other possible signal degradation and so
contributes to the improved S/N ratio.
c. Newly-developed pixel converter
To enable 720p/60 recording, a new super encoder and a new pixel
converter were developed, incorporating an adaptive filter which
optimizes the scalar performance of cross-converted signals,
including 1080i. The resultant effects are increased resolution and
reduced aliasing. Objects thus have much more natural looking
edges and images are therefore extremely lifelike in appearance.
The GY-HD200, fitted with
Mini 35 lens film adapter
from P & S Technik.
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