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10. Technologies
10.2. HDCP Management
Lightware Visual Dngineering is a legal HDCP adopter. Several
functions have been developed which helps to solve HDCP related
problems. Complex AV systems often have both HDCP and non-HDCP
components. The matrix allows transmitting HDCP encrypted and
unencrypted signals. The devices will be still HDCP compliant as they
will never output an encrypted signal to a non-HDCP compliant display
device. If an encrypted signal is switched to a non-compliant output, a
red screen alert or muted screen will appear.
10.2.1. Protected and Unprotected Content
Many video sources send HDCP protected signal if they detect that
the sink is HDCP capable – even if the content is not copyrighted. This
can cause trouble if an HDCP capable device is connected between
the source and the display. In this case, the content cannot be viewed
on non-HDCP capable displays and interfaces like event controllers.
Rental and staging technicians often complain about certain laptops,
which are always sending HDCP encrypted signals if the receiver
device (display, matrix router, etc.) reports HDCP compliancy. However,
HDCP encryption is not required all the time e.g. computer desktop
image, certain laptops still do that.
To avoid unnecessary HDCP encryption, Lightware introduced the
HDCP enabling/disabling function: the HDCP capability can be
disabled in the Lightware device. If HDCP is disabled, the connected
source will detect that the sink is not HDCP capable, and turn off
authentication.
10.2.2. Disable Unnecessary Encryption
HDCP Compliant Sink
Encrypted
signal
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C C O O N N T T R R O O L L
L L O O C C K K
AUTO
TAKE
PRESET
LOAD
SOURCES
O O U U T T P P U U T T
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SIGNAL
L L O O C C K K
EDID
PRESENT
DESTINATIONS
ESC
TEST INPUT
USB
control
PREVIEW OUTPUT
DVI cable
17x17 DIGITAL MATRIX ROUTER
MX-FR17
Protected
MX-FR Matrix
content
All the devices are HDCP-compliant, no manual setting is required, both
protected and unprotected contents are transmitted and displayed on
the sink.
Not HDCP-compliant Sink 1.
Unprotected
content
Not-HDCP compliant sink is connected to the matrix. Some sources
(e.g. computers) always send HDCP encrypted signals if the receiver
device reports HDCP compliancy, however, HDCP encryption is
not required all the time (e.g. computer desktop image). If HDCP is
enabled in the matrix, the image will not be displayed on the sink.
Setting the HDCP parameter to Auto on the output port and disable
HDCP on the input port, the transmitted signal will not be encrypted
if the content is not protected. Thus, non-HDCP compliant sinks will
display non-encrypted signal.
Not HDCP-compliant Sink 2.
Protected
content
The layout is the same as in the previous case: non-HDCP compliant
display device is connected to the matrix but the source would send
protected content with encryption. If HDCP is enabled on the input
port of the matrix, the source will send encrypted signal. The sink
is not HDCP compliant, thus, it will not display the video signal (but
blank/red/muted/etc. screen). If HDCP is disabled on the input port
Encrypted
of the matrix, the source will not send the signal. The solution is to
signal
SAVE
PRESET
replace the display device to an HDCP-capable one.
POWER
DVI cable
HDCP-compliant
sink
MX-FR Series Modular Matrix Frames – User's Manual
Non-encrypted
Non-encrypted
signal
signal
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C C O O N N T T R R O O L L
L L O O C C K K
AUTO
TAKE
LOAD
PRESET
PRESET
SAVE
SOURCES
O O U U T T P P U U T T
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SIGNAL
L L O O C C K K
EDID
PRESENT
DESTINATIONS
ESC
TEST INPUT
POWER
control
USB
PREVIEW OUTPUT
DVI cable
DVI cable
17x17 DIGITAL MATRIX ROUTER
MX-FR17
MX-FR Matrix
Non-HDCP
compliant sink
Encrypted
signal
C C O O N N T T R R O O L L
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TAKE
LOAD
SAVE
L L O O C C K K
AUTO
PRESET
PRESET
SOURCES
L L O O C C K K
O O U U T T P P U U T T
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EDID
PRESENT
SIGNAL
DESTINATIONS
ESC
TEST INPUT
USB
POWER
DVI cable
control
PREVIEW OUTPUT
DVI cable
17x17 DIGITAL MATRIX ROUTER
MX-FR17
MX-FR Matrix
Non-HDCP
compliant sink
10.3. Pixel Accurate Reclocking
Signal reclocking is an essential important procedure in digital signal
transmission. After passing the reclocking circuit, the signal becomes
stable, jitter-free, and can be transmitted over more equipment like
processors, or event controllers. Without reclocking, sparkles, noise,
and jaggies appear on the image.
Lightware's sophisticated Pixel Accurate Reclocking technology
fixes more problems than general TMDS reclocking. It removes not
only intra-pair skew but inter-pair skew as well. The Pixel Accurate
Reclocking circuit eliminates the following errors:
Intra-pair skew
Skew between the + and - wires within a differential wire pair (e.g.
Data2- and Data2+). It's caused by different wire lengths or slightly
different wire construction (impedance mismatch) in DVI cable. It
results in jitter.
+
-
Intra-pair skew
Inter-pair skew
Skew between two differential wire pairs in a cable. It is caused by
different wire pair lengths or different number of twists in the DVI
cable. Too much inter-pair skew results color shift in the picture or
sync loss.
+
-
+
-
Inter-pair skew
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Troubleshooting
