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In 1884, German, Paul Nipkow developed a rotating-disc technology to transmit pictures over wire, it was the first electromechanical TV scanning system. It was called the Nipkow disk. |
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AUDIO / VISUAL
Plasmas, LCD, Projectors, stands, mounts and all the electronics in between for switching,
converting, distributing, connecting and presenting your programme
(we can even add the frills to make it look impressive) is a way of life at Vistrac.
Bigger is better? If so, then have a 52" plasma or a 30foot video screen at the Stadium, or
what about a 12 foot screen projecting at 5000 lumens at an indoor event with the house
lights on? Now that's serious! Call us in long before so our IT Presentation Content
Creators can sit with you to develop a presentation that would keep your audience educated
and glued to their seats.
Our install department can design and build your perfect conference room, training/classroom or
Home Theatre. Since we are the authorized distributors for most of the lines we use for
example, Sanyo, DaLite and NEC.We can install and supply all the A/V equipment you will
ever need be it a school, House of Worship, shopping centre or the traveling presenter.
Our certified service technicians will maintain and repair if required. We may even lend
you one of our while we repair yours.
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VIDEO CONFERENCING
Many regional and global companies recognize the efficiency of full Video Conferencing.
- Conferencing systems such as the innovative POLYCOMŽ Conferencing Line
- Closed-circuit televisions (CCTV), flat panel plasma monitors
- Enhanced room lighting system
- Cutting-edge technology and expertise is required and much more.
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DIGITAL STORAGE OF ARCHIVE MATERIAL
In this digital age you can achieve full back-up support by storing your archive material on various formats - FILM, BETAMAX, VHS, U-matic Betacam to DVD, VCD or any other digital formats. Vistrac Limited also does transfers from PAL formats.
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DISK DUPLICATION AND REPLICATION
- Digital audio productions.
- Re-mastering services.
- Editing facilities.
- Compact Disc Duplication and Replication.
- CD Labelling & Packaging (including Graphic Design & Thermal Printing via Computer-to-Press technology)
- Music industry and corporate sector:
- the manufacturing of compact discs
- CD Brochures
- Data Duplication
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PLASMA DISPLAYS
Plasma display panels create their images with a fourth state of matter - a charged gas,
also known as plasma. It is a fixed pixel technology, meaning that there are a number of small
dots (pixel) that are lit with appropriate colors to create an image. Each pixel contains sub
pixel, each of which has a phosphor coating on their outer surface corresponding to the three
primary colors (red, green and blue). The sub- pixels are lit in a combination that creates
the look of a single color within each pixel. This is done by applying an electrical charge
to the sub-pixel. The excited sub-pixel then causes the phosphor coating to burn, giving off
a colored glow.
Because the glowing ceases almost immediately once the electrical charge is removed, plasma has
a smooth, natural quality when displaying video. By illuminating phosphors, plasma displays are
able to achieve a color palette and color accuracy similar to the more CRT displays (televisions)
making them more appealing to most people's eyes. As an emissive technology (makes its own light
within the pixel), plasma displays also have excellent viewing angles. Thanks to the extensive
research, plasma phosphors have an average life expectancy of 30,000 to 60,000 hours, depending
on the model. Compare this to the average CRT television lifespan of 10,000 - 15,000 hours.
Plasma panels do not leak and do not need to be 'recharged'
Electrograph Systems
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LCD DISPLAYS
Liquid Crystal Display (LCD) is the oldest of the current flat panel technologies. It is also
the only technology used in both Flat Panel Display (FPD) and microdisplay devices (Front and
rear projection TV). Thanks to both the maturity of the technology and its flexible applications,
LCD is improving at a rapid pace.
The type of LCD used in both of these applications is known as transmissive LCD. A light source
is positioned to send light through the individual cells (sub-pixel) of the panel. Each pixel
(dot) consists of three sub-pixels: one red, one Green, one Blue. A sub-pixel has crystals
inside that act like Venetian blinds. Opening the 'blinds' further allows more light to pass
through, bringing more color with it. Varying combinations of the three primary colors create
a spot of a particular color (pixel) and intensity. All of the pixels together create the image.
The advantages to a LCD FPD are excellent color saturation, better contrast in ambient light,
extremely long panel life, lighter weight, and higher resolution at a given size. LCD has
typically had disadvantages in several areas, such as Contrast Ratio, white balance, black
levels, grayscale performance, color temperature, viewing angles and moving video. Recent
advances in lamps and LCD technology have allowed LCD to close the gap with or move ahead
of competing display technologies in many of these areas.
Previously limited to 40" diagonal screen sizes, LCD's are now available in sizes up to
46" and are expected to break the 50" barrier soon. These larger size LCD flat panel displays
generally have a 1920 X 1080 progressive scan resolution. With the highest resolution video
sources currently at 1080i (1920 X1080 interlaced), and most video sources being much lower
resolution, many of these larger LCD TVs and monitors will require an external video processor
to achieve the best image quality.
From 26" to 40" diagonal screen size, the most current LCDs are 1280 X 768 resolutions. Not
quite true 16:9 proportion, these displays provide an excellent compromise for normal 4:3
computer images, standard definition 4:3 video and Hi-Definition 16:9 video. This resolution
is also very popular for video teleconferencing technology applications, due to the ability to
fill more screen area with 2 side by side 4:3 images, as compared to a 16:9 display at the same
diagonal size. Some LCDs 37" and 40" are true 16:9, while all larger size fits this category.
As the luminance of an LCD is provided by a backlight, with the LCD element only adding color,
this type of display does not 'wear out'. Some displays have replaceable backlights, for a
seemingly infinite lifespan. With typical backlight expectancies in the 50,000 - 60,000 hour
range, even non-renewable panels will provide 6-7 years of use in a 24/7 application.
Electrograph Systems
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LCD/DLP PROJECTOR
Multimedia projectors are imaging devices that take an electronic signal and convert it to a large
image on a wall or screen. Utilizing a high intensity lamp, digital microdisplay, and a precision
lens array, they create an image with a signal from a computer, DVD, VCR, document camera, etc.
all projectors are a compromise of brightness, contrast ratio, weight, resolution and inputs.
Each of the three Micro display technologies has advantages and disadvantages in these areas.
LCD - Liquid Crystal Display. - The oldest and most common projection technology, all current LCD
projectors use a 3-chip design. With the LCD panel for each of the primary display colors (red,
green, blue), this technology has the best potential for color saturation and color accuracy.
Significant advances have allowed LCD projectors to gain ground in the area of size and weight,
as well as improving their traditional strength of brightness. As the most mature technology,
LCD is generally the most economical solution for a given size and brightness. Recently, LCD
leveraged these advantages to provide Home Theatre enthusiast on a budget with a native 16:9
projectors with 480p, 1/4HD, and 720P resolutions at prices that have yet to be matched by the
other major projection technologies.
DLP- Digital Light Processing - a patented and trademarked technology invented and controlled by
Texas Instruments, DLP has become the most popular technology in the Home Theatre projection.
TI has made great strides improving the traditional strengths of DLP - contrast ratio, pixel
separation, black levels, and size. The smallest two and three pound projectors use DLP
technology. DLP projectors utilizing a 3-chip design provide exceptional color accuracy to
enhance the smooth image provided by DLPs tight pixel structure. As the only purely reflective
technology, DLP has become the dominant projection technology in 24/7 applications.
LCoS - Liquid Crystal on Silicon - The newest micro display technology, LCoS has been difficult
and expensive to mass produce. The effort has paid off for the fans of the tightest pixel
structure in micro displays. Some varieties of LCoS have achieved a pixel refresh rate comparable
to CRT at four microseconds. Between the tight pixel structure, the fast pixel changes, and the
potential for extreme color accuracy, LCoS has many fans in the Home Theatre market. LCoS made
the first forays into ultra-high resolution with native resolution of 1280 X 1024 and 1365 X
1024 years before other technologies could reach this plateau.
Electrograph Systems
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PERIPHERALS
Display device peripherals are often the 'missing link' in the AV system. Whether for Home
Theatre, business, education, or house of worship use, any display system will only be as good
as its weakest component.
Any system can be broken down into sources (where the images start), interfaces and cables
(where the images are processed and transported), and displays (where the picture is shown).
Other peripherals can include cosmetics such as custom frames to dress up (or hide) the display,
racks or furniture to store, organize, and protect the sources and interfaces, and mounts to
suspend the display.
Interfaces can split and amplify an image signal (distribution amplifier), select different
sources to be displayed (switcher). Or send the same or different images to several displays
(matrix switcher). Other interfaces changes signal types and/or resolutions (converter or scaler)
for use with other wise compatible devices.
Mounts for projectors, plasmas, and LCDs enable a display to be hung on the wall or from a
ceiling. Some even allow a unit to be pulled from the wall and angled for better visibility.
High quality cables and connectors will allow a signal to be sent farther with maximum image
quality and the display device. Saving a few dollars on cables and connectors can compromise
the image quality of your expensive Flat Panel Display. Proper power delivery is another
way to maximize your image quality. Adding a Power Line Conditioner will allow all of your
audio and video components to provide best results. In addition to the improvements in the
sounds and images, your expensive A/V system will be truly protected from surges, spikes and
uneven power.
Control and automation is the fastest growing segment of the display peripheral market.
Allowing you to perform multiple functions with a single button push (or by entering a room),
a well designed and configured control system will allow the customer to operate to operate
complex AV systems with little or no training. They are also used to reduce start up time,
reduce and monitor system maintenance, and to save money. Nothing spells savings like a
control system that ensures all your equipment are shut off at 6.00 pm. Or one that allows
you to connect online while on vacation to ensure the lights are off and the alarm is set.
Electrograph Systems
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