Key Digital KD-VPHD4X1 User manual

OPERATING INSTRUCTIONS
KD-VPHD4X1
HDMI Video/Audio Switcher and Digital Video Processor
KD-VPHD4X1 Switcher & Processor (with HDCP) that switches any of four (4) inputs
of HDMI A/V to one (1) output. Conveniently switches NTSC and PAL video sources,
and multiple audio formats. The selected input video can be scaled to match the
native resolution of your display, using world-renowned Key Digital®Clear Matrix
Pro™technology. Easily control all features with the convenient front-panel display
and pushbuttons, the IR Remote Control, or RS-232. It’s all-digital, for the absolute
best, crystal-clear, and pristine switching and picture quality!

KD-VPHD4X1 Operating Instructions
2
KD-VPHD4X1 Switcher & Processor
Safety Instructions – Please be sure to follow these
instructions for safe operation of your unit
1 Read these instructions.
2 Keep these instructions.
3 Heed all warnings.
4 Follow all instructions.
5 Do not use this apparatus near water
6 Clean only with dry cloth.
7 Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.
8 Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.
9 Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized
plug has two blades with one wider than the other. A grounding type plug has two
blades and a third grounding prong. The wide blade or the third prong are provided
for your safety. If the provided plug does not fit into your outlet, consult an electrician
for replacement of the obsolete outlet.
10 Protect the power cord from being walked on or pinched particularly at plugs, con-
venience receptacles, and the point where they exit from the apparatus.
11 Only use attachments/accessories specified by the manufacturer
12
Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or
sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip-over.
13 Unplug this apparatus during lightning storms or when unused for long periods of
time.
14 Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is dam-
aged, liquid has been spilled or objects have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not operate normally, or has been
dropped.

3
TABLE OF CONTENTS
Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
About the KD-VPHD4X1 Switcher & Processor . . . . . . . . . . . . . . . . . . . .6
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
IR Remote Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
RS-232 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
How to Contact Key Digital®. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
© 2009 Key Digital Systems, Inc. All rights reserved.

KD-VPHD4X1 Operating Instructions
4
KEY FEATURES
The KD-VPHD4X1 Switcher & Processor is a 4x1 HDMI Switcher & Processor that supports
HDCP Copy Protection and switches any of four (4) inputs of HDMI A/V to one (1) output.
Concurrently switch all Inputs, including HDMI, Toslink Optical audio, digital PCM audio, and
analog Left & Right stereo audio. It's all-digital, for crystal-clear and pristine switching and
picture quality!
Conveniently switches 60 Hz and 50Hz
video sources, and multiple audio
formats.The selected input video can be
scaled to match the native resolution of your
display, using world-renowned Key Digital®
Clear Matrix ProTM technology. All the video
processing features you'd expect from Key
Digital®are also provided. Use the conven-
ient front-panel display and pushbuttons,
the IR Remote Control, or RS-232 to easily
control all features of the product.

5
HDMI Switcher & Processor:
■
Crystal-clear switching of four (4) HDMI Inputs to One (1) HDMI Output
■
HDMI Type A 19-pin connector
■
To support DVI-D Video I/O, use HDMI<>DVI adapter cable(s)
■
Supports HDCP Copy Protection
■
Switches 60 Hz and 50Hz video sources, and multiple audio formats
■
HDMI repeater functionality with hot plug detection
Switches Video and Audio with individual connectors for:
■
HDMI Video and Audio
■
Toslink Optical Audio
■
Digital PCM Audio
■
Analog stereo Left & Right Audio
Can also be configured to process and scale any HDMI video input to match
the native resolution of your display:
■
Using world-renowned Key Digital®Clear Matrix ProTM technology
■
A full-function, high-quality Video Processor is included
■
Supports all popular source and display formats and resolutions
■
Pass-through mode (output = input)
■
Accepts and automatically detects 60 Hz and 50 Hz input formats (the output frame rate
will be the same as the input frame rate)
■
Built-in Test patterns available through the front-panel controls as well as RS-232
Easy to control and operate:
■
Convenient front-panel display and pushbuttons
■
Store your custom settings (like brightness, contrast, much more) for each of the four (4)
HDMI Inputs
■
Easy-to-operate IR Remote Control, and rear-panel remote input
■
RS-232
■
Firmware upgradeable

KD-VPHD4X1 Operating Instructions
6
About the KD-VPHD4X1 Switcher & Processor
Thank you for purchasing the Key Digital®KD-VPHD4X1 Switcher & Processor, a high-quality,
versatile HDMI switcher that supports HDCP Copy Protection and switches any of four (4)
inputs of HDMI A/V to one (1) output. As more and more A/V products support the HDMI
interface, you'll find that the KD-VPHD4X1 Switcher & Processor is exactly the solution you've
been looking for. Your HDMI switcher & processor is engineered with the latest state-of-the-
art technologies, and conveniently provides many useful features that are easy to configure
and control. The all-digital HDMI interface and Key Digital®switching and processing provide
the absolute best, crystal-clear, and pristine picture quality!
The Solution you've been waiting for, the solution you've been looking for…
The KD-VPHD4X1 Switcher & Processor is ideally suited to interface a wide array of source
products with an HDMI or DVI output, like your DVD player, Satellite Box, HD DVR, Set Top
Box, or even your PC, to any display with an HDMI or DVI input.
Audio
Cable Box
DVD Player
Surround Sound
Blu-Ray
Blu-Ray
KD-VPHD4X1
Plasma TV
HDMI/DVI*
1
080i
1
080i
480p
1
080i
HDMI/DVI*
HDMI/DVI*
HDMI/DVI*
Audio
RS232 Control
Wired IR
Optical IR
1
080p

7
4 Inputs to 1 Output HDMI Switcher & Processor:
Let's start with the basic functions of your Key Digital®KD-VPHD4X1 Switcher & Processor.
First and foremost, you purchased the product as a four (4) input to one (1) output switcher,
capable of supporting the 19-pin HDMI Type A connections with HDCP (Copy Protection).
Your Key Digital®KD-VPHD4X1 Switcher & Processor carries whatever
signals are present on your HDMI cables. That means that you can
switch Video as well as Audio. HDMI lets source devices (like your DVD
player, Satellite / Set Top Box, or PC) “talk” with your display or “sink”
device, and your KD-VPHD4X1 Switcher & Processor functions as a true
HDMI repeater to pass along this information. Your switching connection
is truly seamless!
Versatile video and audio Inputs and Outputs:
Next, let's look at the versatility offered by your KD-VPHD4X1 Switcher & Processor. Flexible
Audio I/O interfaces include HDMI, Toslink Optical audio, digital PCM audio, and analog Left &
Right stereo audio. If you have a DVI device you want to switch, or a display with a DVI input,
simply use HDMI<>DVI adapter cable(s).
Abuilt-in Scaler to perfectly match the native resolution of your display:
All of the above features are what you've come to expect from Key Digital®. In fact, you can
stop right here, and you would have the perfect solution for all your HDMI switching require-
ments. But your KD-VPHD4X1 Switcher & Processor offers so much more…
Wouldn't you like to get the most your HDMI interface has to offer? Sure, HDMI is a pristine,
digital A/V interface. But how do you best interface your 480 sources to the native resolution
of your display? Or what if the HD output from your Satellite / Set Top Box doesn't match
the native resolution of your display? Or what if you want to connect your PC to a projector?
This is where the beauty of your Key Digital®KD-VPHD4X1 Switcher & Processor shines
through. With world-renowned Key Digital®Clear Matrix ProTM technology built right into your
KD-VPHD4X1 Switcher & Processor, any selected input video can be scaled exactly to match
the native resolution of your display. Most of the popular source and display formats and
resolutions are supported.
A built-in Video Processor:
But the power of your KD-VPHD4X1 Switcher & Processor does not end there. An easy-to-
operate, full-function, high-quality Video Processor is built into your switcher. For each input,
you can control a broad range of functions, from Brightness and Contrast, to Size, Position,
and even “Zoom” - Aspect Ratio adjustments. Test patterns built-into your KD-VPHD4X1
Switcher & Processor help you set-up your video system.
So easy to Control:
With so many features and versatility, you may be wondering: Is the KD-VPHD4X1 Switcher &
Processor easy to operate and control? Simply use the convenient front-panel display and
pushbuttons, the IR Remote Control, or RS-232 to easily control all features of the product.

KD-VPHD4X1 Operating Instructions
8
Getting Started
Follow these instructions to quickly and easily set-up your KD-VPHD4X1 Switcher &
Processor unit.
Open the carton and you will find the following contents:
1. One KD-VPHD4X1 Switcher & Processor unit
2. External, 6-Volt power supply
3. IR Remote Control with batteries included
4. Operating Instructions Manual
5. Warranty card
Setting up your KD-VPHD4X1 Switcher & Processor for operation:
Your KD-VPHD4X1 Switcher & Processor is easy to configure and operate. In this section,
you will first connect all of your A/V input and output devices to your KD-VPHD4X1 Switcher
& Processor unit. Do not connect the external 6 Volt DC supply (provided) to the back of
the Switcher & Processor until all your Video and Audio connections to the KD-VPHD4X1
Switcher & Processor are complete.
1. Become familiar with the location of the buttons, display, and connectors on your
KD-VPHD4X1 Switcher & Processor unit.
LCD Display: provides visual indi-
cation of modes, formats, and
selections
Power On-Off
Toggle
Menu Select pushbutton
invokes your
choices
IR Remote detector
Navigation & Control
Scroll Pushbuttons
Up Down Left Right
Input Select: convenient selection
of which 1-of-4 Inputs to switch to
the Output
Front-panel view of the KD-VPHD4X1 Switcher & Processor

9
2. Find a convenient and safe location to place your KD-VPHD4X1 Switcher &
Processor unit.
3. Connect your A/V Equipment to your KD-VPHD4X1 Switcher & Processor unit.
You may have several source devices with an HDMI output that you would like to convenient-
ly connect and arbitrarily switch into your display device. Your KD-VPHD4X1 Switcher &
Processor accepts up to four (4) source devices. You can select (switch) any one (1) of these
four (4) devices to the output of the switcher & processor and hence to the input of your dis-
play.
Video signals are carried digitally over the HDMI link. The KD-VPHD4X1 Switcher &
Processor is a true HDMI repeater, and detects the characteristics of the source and display
devices. The KD-VPHD4X1 Switcher & Processor supports HDCP Copy Protection.
You may decide to route your Audio signals over HDMI (along with the Video). Your KD-
VPHD4X1 Switcher & Processor also supports Audio switching of digital coaxial PCM audio
(1 x RCA connector), Toslink optical audio, and/or analog audio Left & Right stereo pairs (2 x
RCA connectors,color-coded Left and Right).
If the equipment you would like to connect to your KD-VPHD4X1 Switcher & Processor has
only DVI-D connectors, then you will need to separately purchase HDMI <> DVI-D adapter
cables to connect the equipment to your KD-VPHD4X1 Switcher & Processor. Remember,
while HDMI supports Video and Audio over the same connection, DVI-D supports Video only
and you will need to separately connect your Audio signals to the KD-VPHD4X1 Switcher &
Processor.
At this time, connect your equipment to the inputs and outputs of your KD-VPHD4X1
Switcher & Processor unit.
Analog Stereo Audio pairs
Left (top) & Right (bottom)
Digital Coaxial
PCM Audio
External Power Supply
jack
Wired Remote
Wired Remote HDMI A/V Inputs
Mode
Program - Normal
Rear-panel view of the KD-VPHD4X1 Switcher & Processor
1234
1234
Toslink Optical
Audio Inputs
Analog Stereo Audio
L&R Pair Out
Toslink Optical
Audio Out
HDMI A/V
Out
1234

KD-VPHD4X1 Operating Instructions
10
4. Be sure that your KD-VPHD4X1 Switcher & Processor is set to “Normal” operating
mode.
To change operating Modes: Power must NOT be applied to your KD-VPHD4X1 Switcher &
Processor unit. The power supply MUST be disconnected (either from the back of your unit
or from the wall outlet) to have a complete power shutdown - reset.
Only select “Program” mode when you need to perform a Firmware Upgrade of your KD-
VPHD4X1 Switcher & Processor unit, as provided and instructed by Key Digital®. Firmware
Upgrade instructions are provided later in this Operating Manual.
If the rear-panel Mode switch is set to “Program” mode and your KD-VPHD4X1 Switcher &
Processor unit is powered ON, or even if the power supply is connected and the unit is
turned OFF, the unit is expecting a firmware upgrade and will not operate properly. If you did
not intend to perform the firmware upgrade, turn your KD-VPHD4X1 Switcher & Processor
unit OFF. Then, you must physically disconnect power to your unit, set the rear-panel Mode
slide switch to “Normal” mode, physically reconnect power to the unit, and then turn the
power back ON to your unit for normal operation of your KD-VPHD4X1 Switcher & Processor.
5. Connect the external power supply to your KD-VPHD4X1 Switcher & Processor
unit.
Do not connect the external 6 Volt DC supply (provided) to the back of the Switcher &
Processor until all your Video and Audio connections to the KD-VPHD4X1 Switcher &
Processor are complete (as described in the prior step of this Operating Manual) and you
have set the Mode switch to “Normal” mode.
Once you have made all the A/V connections to your KD-VPHD4X1 Switcher & Processor and
the Mode is set to “Normal”, plug in the external 6 VDC @ 5 Amp Power Supply (provided with
your unit) to the jack on the back of the unit and connect the power cord into an appropriate-
ly rated wall outlet or power strip. You may now turn your KD-VPHD4X1 Switcher & Processor
unit ON using the front-panel pushbutton, the IR Remote Control, or RS-232.
Mode: Program - Normal
Physically disconnect the power to your unit before setting the
rear-panel Mode slide switch to “Normal” mode

11
Basic Operation of the KD-VPHD4X1 Switcher &
Processor
Now that you have connected your A/V equipment and the power supply to the KD-
VPHD4X1 Switcher & Processor, you are ready to operate and control the unit.
Be sure that your KD-VPHD4X1 Switcher & Processor is set to “Normal” operating mode, as
instructed in the prior Step in this Operating Manual:
Whenever power is supplied to your KD-VPHD4X1 Switcher & Processor unit and your unit is
“turned OFF,” the unit is actually in “Standby” mode. To change operating Modes, power
must NOT be applied to your KD-VPHD4X1 Switcher & Processor unit. The power supply
MUST be disconnected (either from the back of your unit or from the wall outlet) to have a
complete power shutdown - reset. Be sure the rear-panel Mode slide switch is set to
“Normal” mode. (Only select “Program” mode when you need to perform a firmware upgrade
of your KD-VPHD4X1 Switcher & Processor unit, as provided and instructed by Key Digital®.)
Controlling your KD-VPHD4X1 Switcher & Processor unit:
Your KD-VPHD4X1 Switcher & Processor is easy to control and operate, and you have several
convenient options for controlling your KD-VPHD4X1 Switcher & Processor. All controls are
available via:
■
Front-panel pushbuttons, with a handy LCD display for instant feedback. The pushbuttons
act to “cycle” through operations, and you can navigate with the Up, Down, Left, and Right
arrows. The LCD will display the current function.
To use the front-panel pushbuttons and LCD:
■
The LEFT and RIGHT arrow pushbuttons allow you to scroll through the different
“menus”
■
The UP and DOWN arrow pushbuttons allow you to scroll through the different
“options” or selections, for the given menu
■
The Select pushbutton allows you to invoke the Menu or Option selection
■
The Input Select pushbutton allows for convenient front-panel selection of which
1-of-4 Inputs to switch to the Output

KD-VPHD4X1 Operating Instructions
12
■
IR Remote Control (discrete commands are available). Always be sure there is a clear line-
of-site from the hand-held IR Remote Control and the IR detection lends at the front right
panel of your KD-VPHD4X1 Switcher & Processor unit.
■
Wired (rear-panel) remote input.
■
RS-232 (Crestron, ELAN, AMX compatible, Control 4)
ON
“Hot Buttons” that bring you
directly to the Menu functions
“Resolution” Allows you to select
the desired output resolution
The LEFT and RIGHT arrows allow
you to scroll through the different
“Menus”
Cycle through and switch any
Input 1 - 4 to the Output
Input Selects
Allow you to switch any Input
1 – 4 to the Output
The Select pushbutton allows
you to invoke the Menu or
Option selection
“Aspect” Allows you to select
the desired output Aspect
Ratio processing
The UP and DOWN arrows allow
you to scroll through the different
“options” or selections, for the
given menu
OFF

13
1. Basic HDMI Switcher & Processor operation.
The most basic operation of your KD-VPHD4X1 Switcher & Processor unit is to provide
switching of any one (1) of up to four (4) HDMI A/V inputs (and corresponding analog, PCM,
and/or Toslink optical Audio inputs) to the output. Since your KD-VPHD4X1 Switcher &
Processor supports full HDMI repeater functionality with hot plug detection, it passes the
EDID upstream > downstream from the e.g. display to the selected (switched) source device.
Having followed the procedures in this Operating Manual, the following steps should have
been taken:
a.Find a safe location for your KD-VPHD4X1 Switcher & Processor
b.All of you're A/V devices should be interconnected to your KD-VPHD4X1 Switcher &
Processor
c.The rear-panel Mode switch should be set to “Normal” mode (before the power
supply is connected to your unit)
d.The external 6 VDC @ 5 Amp power supply should be connected to the rear of
your unit and plugged into an appropriate power outlet
Now, turn the power ON to your KD-VPHD4X1 Switcher & Processor unit. Press the Power
switch on the front left of the unit, or use the IR Remote Control:
You can immediately enjoy using your KD-VPHD4X1 Switcher &
Processor by selecting any desired input to be switched to the output, using the “Input
Select” switch on the front right of the unit. Simply depress the “Input Select” switch and
cycle through for Input 1, Input 2, Input 3, or Input 4. Your KD-VPHD4X1 Switcher &
Processor will detect all active inputs.
Note that the Inputs 1 through 4 correspond to the HDMI inputs as marked on the rear panel
of the switcher & Processor. Also note that the corresponding analog, PCM, and/or Toslink
optical Audio inputs are also switched to their output.
You may also select which input is switched to the output using the IR Remote Control.
Power On-Off
Toggle
Input Select: convenient selection of which
1-of-4 Inputs to switch to the Output

KD-VPHD4X1 Operating Instructions
14
2. Understand the full capabilities of your KD-VPHD4X1 Switcher & Processor unit.
Your KD-VPHD4X1 Switcher & Processor unit is feature-rich, and performs much more than
“4 x 1” switching of HDMI signals A/V and corresponding analog, PCM, and/or Toslink optical
Audio. Your KD-VPHD4X1 Switcher & Processor unit has a built-in, high-quality scaler and
video processor. Before we start to operate and control these functions, let's look at the
gamut of features provided in your unit:
Video Processing Functions Provided
■
Key Digital®DPETM (digital picture enhancement) and DEETM (digital edge enhancement)
■
Sharpness, Brightness, Contrast
■
Saturation, Hue
■
Horizontal & Vertical Size, Position, Input Offset
■
Zoom (Output Aspect Ratio processing), including options to prevent monitor burn-in for
Letterbox or Pillarbox images:
■
Full
■
Letterbox, Pillarbox
■
Horizontal Zoom, Vertical Zoom, Horizontal and Vertical Zoom
You can also scale the selected (switched) HDMI video input to match the native resolution
of your display:
■
Using world-renowned Key Digital®Clear Matrix ProTM and SDSTM (Super Digital Scaling)
technologies to deliver world-class scaling
■
Supports all popular source and display formats and resolutions
3. Operating the KD-VPHD4X1 Switcher Video Scaler and Video Processor.
The Video Scaler and Video Processor built into your KD-VPHD4X1 Switcher & Processor unit
is easy to operate. You can control these functions using the front-panel pushbutton switch-
es or your IR Remote Control, with instant feedback from the front-panel LCD display.
Use the “Menu” pushbutton, and “Arrow” keys to scroll through the Menu options. For each
input, first select the video format carried by your HDMI signal: either RGB or Component
(YPbPr). Each of the four (4) Inputs HDMI Inputs has a separate memory, so you can save
your preferred settings per input device. You can then select and store the following preferred
parameters for:
■
Brightness
■
Sharpness
■
Contrast
■
H-Size

15
■
V-Size
■
Saturation
■
Hue
■
H-Input Offset
■
V-Input Offset
■
H-Position
■
V-Position
■
Input format (RGB or YPbPr)
■
Zoom / Aspect Ratio
Once you have selected a parameter to adjust for a particular Input (Input 1 through 4),
simply use the Left and Right Arrow buttons to move through the range. For example,
“Brightness” is set to a factory default of “00” but can be adjusted Up to +50 or Down to -50.
When instructed, you can reset the setting to Factory Default using the “Select” pushbutton on
the front panel.
4. Video Resolution Formats Supported.
The world-class video processor and scaler built into your KD-VPHD4X1 Switcher & Processor
converts the Input Video format to match the resolution format of your display. Pass-through
mode
(output = input). Most popular Input and Output video resolution formats are supported,
including:
Input Formats Supported:
■
720 x 480i @ 60 Hz
■
720 x 480p @ 60 Hz
■
1280 x 720p @ 60 Hz
■
1920 x 1080i @ 60 Hz
Output Formats Supported:
■
640 x 480p @ 60 Hz
■
720 x 480i @ 60 Hz
■
20 x 480p @ 60 Hz
■
920 x 540 p @ 60 Hz
■
1280 x 720p @ 60 Hz
■
1368 x 768p @ 60 Hz
■
1280 x 768p @ 60 Hz
■
1400 x 1050p @ 60 Hz
■
1920 x 1080i @ 60 Hz
■
1920 x 1080p @ 60 Hz
■
576i @ 50 Hz
■
576p @ 50 Hz
■
720p @ 50 Hz
■
1080i @ 50 Hz
■
576i @ 50 Hz
■
576p @ 50 Hz
■
720p @ 50 Hz
■
1080i @ 50 Hz
■
Pass-through mode (output = input)

KD-VPHD4X1 Operating Instructions
16
5. Zoom - Aspect Ratio adjustments.
Your KD-VPHD4X1 Switcher & Processor can perform output Aspect Ratio processing,
including options to prevent monitor burn-in for Letterbox or Pillarbox images:
■
Full
■
Letterbox, Pillarbox
■
Horizontal Zoom, Vertical Zoom, Horizontal and Vertical Zoom
You can also scale the selected (switched) HDMI video input to match the native resolution
of your display:
■
Using world-renowned Key Digital®Clear Matrix ProTM and SDSTM (Super Digital Scaling)
technologies to deliver world-class scaling
■
Supports all popular source and display formats and resolutions
Firmware Upgrades
From time-to-time, Key Digital®provides the option for you to update the Firmware that oper-
ates and controls your KD-VPHD4X1 Switcher & Processor, such as to add a new or
improved feature. These updates are optional, and you should only perform upgrades as
provided and instructed by Key Digital®. Check our web site at www.keydigital.com for the
latest firmware updates.
Should a Firmware Upgrade be available that you are interested in installing in your unit,
please be sure to carefully and completely follow all of the steps described below.
1. H Zoom (Horizontal Zoom): This “H Zoom” feature is particularly useful for some
Plasma owners, who may want to stretch the image to fill the screen and avoid the
nasty burn-in. If the input signal is a Pillarbox, Horizontal Zoom extends (distorts) the
image from left to right to fill the screen. For example, when a 4:3 movie is up-con-
verted to HDTV in a studio, it may be simply released in the Pillarbox format, with
black bars to the left and right of the image in a 16:9 window.
2. V Zoom (Vertical Zoom): This “V Zoom” feature is particularly useful for some
Plasma owners, who may want to stretch the image to fill the screen and avoid the
nasty burn-in. If the input signal is a Letterbox, Vertical Zoom extends (distorts) the
image from top to bottom to fill the screen. For example, it is very common for a
widescreen DVD movie to be presented in Letterbox, because the original movie
may be captured in 2.35:1 Cinemascope or some other Aspect Ratio that creates a
small letterbox in a 16:9 window.
3. HV Zoom: This mode simultaneously stretches the image uniformly in both the
Horizontal and Vertical directions, using the same ratios as in H Zoom and V Zoom.
This Zoom mode may be preferred over the H- or V-Zoom, both of which geometri-
cally distort the image. Because the image is “Zoomed,” there will be a slight loss
(cropping) of the image at the top and bottom for Pillarbox sources, and at the left
and right for Letterbox sources.

17
In order to perform the Firmware Upgrade, be sure that your KD-VPHD4X1 Switcher &
Processor is set to “Program” operating mode:
The power supply MUST be disconnected (either from the back of your unit or from the wall
outlet) to have a complete power shutdown - reset. Next, set the rear-panel Mode slide
switch to “Program” mode. Only select “Program” mode when you need to perform a
firmware upgrade of your KD-VPHD4X1 Switcher & Processor unit, as provided and instruct-
ed by Key Digital®.
Mode: Program - Normal
Physically disconnect the power to your unit before setting
the rear-panel Mode slide switch to “Normal” mode

KD-VPHD4X1 Operating Instructions
18
RS-232 Commands
RS-232 Discrete Commands
Provided below is a table of the Discrete RS-232 Commands that allow you to control your
KD-VPHD4X1 Switcher & Processor.

19

KD-VPHD4X1 Operating Instructions
20
Technical Specifications
General
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KD-VPHD4X1 Switcher & Processor, Model KD-VPHD4:
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4-Inputs to 1-Output HDMI Switcher & Processor
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Crystal-clear switching of four (4) HDMI Inputs to one (1) HDMI Output
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HDMI Type A 19-pin connector
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To support DVI-D Video I/O, use HDMI<>DVI adapter cable(s)
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Supports HDCP Copy Protection
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HDMI repeater functionality with hot plug detection
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Switches Video and Audio with individual connectors for:
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HDMI Video and Audio
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Toslink Optical Audio
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Digital PCM Audio
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Analog stereo Left & Right Audio
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Can also be configured to process and scale any HDMI video input to match the native res-
olution of your display:
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Using world-renowned Key Digital®Clear Matrix ProTM technology
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A full-function, high-quality Video Processor is included
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Supports all popular source and display formats and resolutions