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FAQ
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DV records data on a cassette
tape whereas DVD records them on a disk. A disk cannot hold as much
information as a cassette tape, which is why DVD uses a much heavier
compression scheme than DVC, drastically affecting the quality of
still image. On top of that, tape is more superior for time-shifting
than a disk which is very limited in what can be recorded on
it. |
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IEEE is the Institute of
Electrical and Electronic Engineers, an organisation that helps
create many international standards. IEEE 1284 is a parallel printer
cable standard whereas IEEE 1384 is the serial bus interface between
VCR, TV, PC, DVD player, printer, camcorder and CD player.
To
find out more check out http://www.canondv.com/index.html |
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Recording video digitally
delivers remarkably better picture quality, sharper images and
better color reproduction. On top of that, digital copies of digital
videos are unrecognizable from the original, which makes editing and
image manipulation -- even at the level of the average camcorder
user -- so much easier and with higher quality than that delivered
by analog video technology. |
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With analog video, light and
sound are captured and recorded as electrical signals, transmitted
as waves that can be represented by the up and down movement of a
line. These signals look like mountain peaks and valleys, with
variations in the height of the mountain and the depths of the
valley, and variations in the distances between peaks and between
valleys. With light, those variations are the differences between
dark and very bright, as well as colors; and with audio, the
differences are between no audible sound and very loud sound. |
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In DVC, 16-bit sound is the
highest quality sound, with the most data for the truest and fullest
range of sound. With 12-bit, the sound quality is just slightly
lower, because the amount of data gathered through the sampling and
quantization procedures is lower than with 16-bit. However, because
there is less data, it does not take up all the space available to
audio on the tape. As a result, there are two two-channel channels
which is beneficial to those who demand more of their equipment. |
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In digital video, there are two
cassette sizes: a larger cassette called 'DV standard' and a smaller
one called 'Mini-DV.' |
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DVD uses quite a different
technology. It's a disk, and like a music CD or computer CD-ROM, it
offers superior random access to information stored anywhere on the
disk. But a disk cannot hold nearly as much information as tape,
which is why DVD uses a much heavier compression scheme than
DVC.
While DVD was designed originally for playing back
prerecorded movies (manufacturers are working on a standard for
recording on DVDs), DVC was designed as a portable record/playback
medium. This becomes evident when still frames are viewed. Because
of the compression schemes used, DVC has the best still frame
images, while a DVD still frame will not be as
clear. |
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