Hall Research EMX-HD-AUD User Manual
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MODEL EMX-HD-AUD AUDIO EXTRACTOR & EDID MGR
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2.9. EDID Mixing
First of all, it is important to understand that any display device only has one
EDID table that has information on all of its video and audio capabilities. The
EMX-HD-AUD gives the user the capability to independently control or alter the
video and audio portions of the EDID. This process is called EDID mixing. At
power up, the default EDID stored within the device is loaded. This could be
either the factory default or a ‘Learned’ EDID.
If a functioning and valid SINK device is connected to the EMX-HD-AUD
‘Output’ connector and the VIDEO EDID mode is set to PASS-THRU, the EDID
from the SINK will be read and loaded into memory.
If the SINK EDID read is a simple 128 byte EDID (like some DVI monitors), a
CEA-861 extension block (2nd 128 bytes) will be added to the EDID with a
default native resolution of 480p and with LPCM 2 channel audio.
If the SINK is disconnected from the VSA-HA-DP connector, the internally
saved EDID will be presented to the SOURCE mixed according to the AUDIO
settings. Each time the VIDEO or AUDIO EDID GUI controls are pressed, the
EDID presented to the SOURCE would be as shown in the following table:
VIDEO MODE
AUDIO MODE
EDID EFFECT
PASS
PASS
SINK EDID PASSED WITH CEC ADDRESS MODIFICATION
PASS
2CHN
SINK EDID PASSED WITH 2CHN AUDIO AND CEC
ADDRESS MODIFICATION
PASS
MULTI
SINK EDID PASSED WITH 2CHN, DTS AND DOLBY AUDIO
AND CEC ADDRESS MODIFICATION
EM
PASS
NOT POSSIBLE
EM
2CHN
INTERNAL EDID PASSED WITH 2CHN AUDIO AND CEC
ADDRESS MODIFICATION
EM
MULTI
INTERNAL EDID PASSED WITH 2CHN, DTS AND DOLBY
AUDIO AND CEC ADDRESS MODIFICATION
2.10.
CEC Physical Addressing
CEC Address modification consists of taking the SINK or INTERNAL EDID and
modifying the address to insert the EMX-HD-AUD CEC Physical address into
the CEC chain. (The EMX-HD-AUD device does not understand any CEC
commands).
For example: SINK EDID has CEC address of 0.0.0.0
EDID given to source will show the EMX-HD-AUD as CEC address 1.0.0.0 and
the display still with its original CEC address of 0.0.0.0