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What is the difference
between the BVM-D24E1WU and the BVM-F24U?
Just about everything. The BVM-D series
of monitors is intended for DTV program
production. To do this, they display signals
between 15.7kHz and 45kHz. This allows
accurate display of NTSC, 480/60i, 720/60p
and 1080/60i formats including any of
the "slow frame rate" or offset
vertical frequencies.
The BVM-F24U is intended
strictly as a progressive scan display.
Its range is much higher starting at 54kHz
and displaying scans as high as 91kHz.
These are frequencies well outside of
the DTV format range.
To do this, video path,
deflection design and power supplies must
use different designs in order to fit
either the DTV or Cinema applications.
Which monitors display
24Psf and which display 24P?
Monitor models which display
24Psf are:
- BVM-F24U 24 inch CineAlta
Display (22.5" viewable area, measured
diagonally)
- BVM-D32E1WU 32 inch DTV
Display (29.5"
viewable area, measured diagonally)
- BVM-D24E1WU 24 inch DTV
Display (22.5"
viewable area, measured diagonally)
- BVM-D20F1U 20 inch DTV
Display (19"
viewable area, measured diagonally)
- BVM-D14H1U 14 inch DTV
Display (13"
viewable area, measured diagonally)
- BVM-D14H5U 14 inch DTV
Display with control (13" viewable
area, measured diagonally)
- BVM-D9H1U 9 inch DTV Display
(8" viewable area, measured diagonally)
- BVM-D9H5U 9 inch DTV Display
with control (8" viewable area,
measured diagonally)
- PVM-20L5/1 20 inch Monitor
(19" viewable area, measured diagonally)
- PVM-14L5/1 14 inch Monitor
(13" viewable area, measured diagonally)
- Only BVM-F24U will display
24P.
The BVM-F24U removes frame
flicker using a newly designed frame store
system that will allow multiple vertical
frequency rates to be displayed. While
not changing any parameter in the picture
other than multiplying the vertical rate,
24P and 24Psf signals are displayed at
2 and 3 times the vertical frequency,
thus removing any frame flicker.
What is Pseudo scan
(ASD Mode)?
Both 720/60P and 1080/60i are out of band
formats for the BVM-F24U. However they
are also used in this application. In
order to view these formats, special processing
must be performed in order to raise the
horizontal frequency within the range
of the BVM-F24U.
This new processing
repeats each line over itself. Essentially
waiting at each horizontal scan so that
the beam scans the same line twice with
the same information. This doubles the
horizontal frequency but doesn’t
change any picture information.
Will the BVM-F24U
display 23.98Hz?
Yes. It will also display:
- 1920 X 1080/24P (displayed
as 1:1)
- 1920 X 1080/24P (displayed
as 1:1.001)
- 1920 X 1080/25P (displayed
as 1:1)
- 1920 X 1080/30P (displayed
as 1:1)
- 1920 X 1080/30P (displayed
as 1:1.001)
- 1920 X 1080/50P (displayed
as 1:1)
- 1920 X 1080/60P (displayed
as 1:1)
- 1920 X 1080/60P (displayed
as 1:1.001)
- 1920 X 1080/24Psf (displayed
as 1:1)
- 1920 X 1080/24Psf (displayed
as 1:1.001)
- 1920 X 1080/25Psf (displayed
as 1:1)
- 1920 X 1080/30Psf (displayed
as 1:1)
- 1920 X 1080/30Psf (displayed
as 1:1.001)
Pseudo scans include:
- 1280 X 720/60/1:1
- 1920 X 1080/50/2:1
- 1920 X 1080/60/2:1
Computer analog RGB only:
- 1280 X 1024/75/1:1 VESA
(5:4 aspect ratio)
- 1280 X 1024/85/1:1 VESA
(5:4 aspect ratio)
These can be input as 4:2:2
single wire, 4:4:4 dual link (either RGB
or Y Pb Pr) or analog RGB (The dual link
input is included with the monitor)
What options should
I consider when buying a BVM-F24U?
Most of the BVM model line is
built as a display. This means that the
control panel is not included. There are
two control panel versions offered.
The BKM-10R is a rack mountable
control panel featuring input selection,
programming functions and normal production
application control functions. It also
includes a PCMCIA card that allows storage
of both configuration and maintenance
settings.
Multiple monitor settings
can be saved on one card and retrieved
by serial number.
The BKM-11R is the brother
of the BKM-10R and includes all of the
same features as the 10R but as a handheld
device that can be connected to the monitor
from a port mounted in the bezel.
One option that must not
be overlooked is the BKM-14L light probe.
This is required for setup of the auto
landing and auto uniformity operations
that will simplify the setup of the monitor.
Are there any automatic
functions in the BVM-F24U? How accurate
are they?
Any monitor of this size is subject to
many adjustments. To simplify this, many
of these adjustments have been automated
to expedite the setup of the monitor.
They include:
- Auto preset adjustment
- Auto matrix adjustment
(used when variable matrix is selected)
- Auto white balance
- Auto uniformity adjustment
- Auto landing adjustment
- Luminance accuracy is
normally within +/- 3 Nits using the
automatics
- Color accuracy is normally
within +/- .003 in both x and y axis
(CIE 1931) when using the BKM 14L probe.
Using the Minolta, Grasby, Philips,
and Thoma probes provide even greater
accuracy. Connection to these probes
can be facilitated using a cable available
from the probe manufacturer.
What is Dual Link?
Dual link is a proposed SMPTE transmission
format that is an extension of the SMPTE
292M serial format. This link is a standard
feature of the BVM-F24U. The format uses
two connections to the monitor. Depending
on the signal used, data is separated
into these two streams that allow either
60 frame progressive data to be input
at 4:2:2 sampling rates or 24P data at
4:4:4 sampling rates. Both RGB and Y Pb
Pr components can be displayed.
What is the variable
matrix and how do I adjust it?
The variable matrix is an additional circuit
that allows additional balance of the
RGB or Y CB CR video paths. This circuit
compensates for level differences between
these paths and allows closer monitor
matching as it compensates for system
level differences. Both the variable and
standard ITU 709 matrices are available
in the BVM-F24U.
Alignment is very simple
and automatic. Simply select the correct
color bar pattern appropriate for the
signal format being used and, in the same
operation, as the automatic presets are
adjusted, so is the matrix.
What is the difference
between Landing and Uniformity?
These are two different anomalies often
confused. Landing is the physical position
of the electron beam with reference to
the correct phosphor. If the beam doesn’t
land exactly center to the phosphor strip,
then the screen will exhibit colored patches
or shaded areas. It can also change the
geometry so that lines are not straight.
The reason that this may happen is due
to terrestrial magnetism. This is the
same phenomenon that moves a compass needle.
The BVM-F24U has a very elaborate
automatic alignment using the BKM-14L
probe. The monitor prompts the operator
to the correct position. As the monitor
takes measurements across the screen it
calculates the correct orientation and
uses six coils ad the screen to align
the beam.
Uniformity is the balance
of light across the screen. Poor uniformity
is shown as darker areas on the picture
face. The BVM-F24U has the ability to
measure any uniformity error and adjust
it out automatically.
What light probes
work with the automatics in the BVM-F24U?
BVM-F24U can use most industry probes
for automatic white balance adjustment.
Probes that talk to the BVM-F24U include
the:
- Sony BKM-14L (required
for landing and uniformity adjustments)
- Minolta CA-100
- Philips RM-5639
- Thoma TF6
- Grasby (UDT) SLS 9400
In addition, the automatic
white balance adjustment is completely
adjustable. Not just by different white
standards, but white reference can be
tuned in using exact x and y coordinates
(CIE 1931)
Am I stuck with using
D65 as a white reference or can you set
the monitor to another temperature?
Almost any white standard can be used.
Simply select the x and y (CIE 1931) coordinates
that designate your standard and the automatics
balance to them.
Is there more than
one color temperature memory?
Since these monitors are used in many
different applications, there are often
times where operations may require different
color temperature settings. These can
be configured to automatically be selected
depending on the input used.
"STD" is a global
setting that can be used as a default
"Col 1" and "Col
2" can be custom settings for different
uses, or "Ch Set" allows a reference
for that one input separate from any other
setup.
What test signals
are required for setting up the monitor?
All but color bars are available from
the monitor itself. Channels 90 to 99
are monitor test signals available for
both manual and automatic setup.
Will the safe area
markers show aspect ratios other than
1.77?
Since there are many formats used for
Cinema work, the BVM-F24U offers a very
flexible safe area marking system. Not
only are there presets for 1.77 and 1.33,
but also 1.66, 1.85, and 2.39. In addition
a completely variable mode is available
for other aspect ratio work.
What is digital
convergence?
In order for a monitor of this caliber
to display 1000 TVL at 1080 speeds, the
monitor must have extremely precise convergence.
Normal monitors require magnets, yoke
adjustments and a multitude of mechanical
adjustments to get you only half way.
BVM-F24U offers a digital control with
80 points on the screen to adjust convergence.
Simply call up the cursor, use the input
select to locate the area of adjustment
and turn the phase knob to make the change.
What phosphors are
used in the BVM-F24U?
The BVM-F24U (as with all BVM monitors)
use phosphors that meet the SMPTE RP144
standard.
What delays are inherent
within the monitor?
Some delay is present in this monitor
due to the processing. This same delay
would be required for any audio monitoring.
This delay varies depending on the type
of signal. The delay between start of
video and start of scan is shown below
(exhibited as audio ahead of video). Analog
signals do not have any appreciable delay.
Also note that ASD formats are not available
as analog.
Input signal format (HD-SDI)
format vs. monitor delay time (ms)
- 1920 _ 1080 / 24P 24P
_ 2 41.7
- 24P _ 3 41.7
- 1920 _ 1080 / 25P 25P
_ 2 40.1
- 25P _ 3 40.1
- 1920 _ 1080 / 30P 30P
_ 2 33.4
- 1920 _ 1080 / 24PsF 24PsF
_ 1 (ASD) less than 0.1
- 24PsF _ 2 41.7
- 24PsF _ 3 41.7
- 1920 _ 1080 / 25PsF 25PsF
_ 1 (ASD) less than 0.1
- 25PsF _ 2 40.1
- 25PsF _ 3 40.1
- 1920 _ 1080 / 30PsF 30PsF
_ 1 (ASD) less than 0.1
- 30PsF _ 2 33.4
- 1920 _ 1080 / 50I _ 1
(ASD) less than 0.1
- 1920 _ 1080 / 60I _ 1
(ASD) less than 0.1
- 1280 _ 720 / 60P _ 1 (ASD)
less than 0.1
- 1920 _ 1080 / 50P 50P
_ 1 (Progressive) less than 0.1
- 1920 _ 1080 / 60P 60P
_ 1 (Progressive) less than 0.1
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