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to complete the 60i fields format required for the 1080i interlaced output of the
player.
B) For the 1080p output the player then de-interlaces the 60i interlaced signal above
by doubling up the frames to obtain a 60 fps progressive version of it. The resulting
signal is then outputted as 1080p 60fps (if the player has that feature) when that
output format is selected in the player.
Such 1080p 60fps output format matches with the inputs of some 1080p TV sets
suited with the capability of accepting 1080p as 60fps. The format is more suitable
for content that originated from 60i interlaced video, but is less suitable for 24fps
film sources.
1080p 24fps Output in Toshiba Players
When playing back 24fps film content, recorded and stored on the disc as 24fps,
applying the video processing above subjects the signal to unnecessary processing.
That processing could have been avoided if the player would have been suited with a
24fps option on the 1080p output, in addition to the 60fps option. In other words, a
pass-thru feature for 24fps film content to be output as is.
Such a feature would be appealing to some TVs and front projectors that accept
24fps, and can display it at a higher frame rate without going to the 3-2 pulldown
interlacing-deinterlacing processing mentioned above. Those capable
TVs/projectors, to avoid the image judder that 24fps would produce if displayed at
that slow speed, display the 24fps at multiples of 24, such as 48fps of Optoma front
projectors, 96fps of Sony Pearl, to name two.
Local theater film projectors avoid the judder by opening the shutter twice per each
frame of the 24 celluloid frames, projecting at 48fps.
Having the 24fps pass-thru feature is particularly important when the Hi Def image is
projected in large screens, where excessive video processing is easier to detect, and
should be avoided as much as possible.
The video processing described above could be done all in the player (3:2 pull-down
to get to 60i and later the 60p deinterlacing), or could be done as just the 60i part in
the player, output the signal as 60i and the TV accepting it that way, and do the
deinterlacing 60i-to-60p part within the 1080p TV.
As in the past, when doing multiple tasks of video processing in the video chain, it is
good to have the choice to assign the best performer on a particular video processing
task (the player, the TV, or in a external scaler, or a combination of them distributing
the steps). However, in this case, there is no choice for 24fps film, it has to be
output as 60i or 60p, as it would be a video source content frame rate.
This is not only about assigning a better performer to a task, is also about avoiding
unnecessary video processing when 24fps film content is to be displayed in a 1080p
24fps capable device.
Toshiba Plans for 1080p 24fps
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