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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 length as the DV
format.
2.HD Progressive
(720p) format for
high quality moving
pictures and digital stills
Progressive scanning
The new ProHD products use the same progressive
scanning system as used in all high-end HDTV cameras.
Progressive scanning systems uniquely
capture and store full frames of image
information. It is a very simple process to
convert a progressive signal to
interlaced, but not vice versa. When
progressive recordings are frozen or
played in slow motion, each individual frame contains the full
detail of the original image — excellent for viewing and
analysing 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, 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.
Multi-format output (BR-HD50)
Progressively scanned pictures are converted easily to the
interlaced format by extracting the odd lines from progressive
frame 1 and the even lines from progressive frame 2 to create
the two fields required for each interlaced frame. Not only
does the BR-HD50 output its native 720p, but also its built-in
scan converter can generate 1080i and standard definition
signals. Converting the other way, to progressive from interlaced,
presents a much greater technical challenge, requiring both
hardware and motion analysis software to achieve
satisfactory results.
Blu-ray and HD-DVD compatible
The IEEE 1394 connector provides a digital
output for editing & recording and for direct
transfer to the new generation DVD formats
(Blu-ray and HD-DVD). ProHD camcorders and
recorders, with their native MPEG-2 TS
(Transport Stream), provide a recording signal
which is easily transferred to these new DVD
formats. This ensures no loss of picture quality.
Advantages of ProHD