Section 4 - Audio
RadianceXD
Rev 1.0
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effect of this method is that the video EDID capability can be passed back from one HDMI output (or user
defined) and the audio EDID capability can be passed back from the other HDMI output (or user defined).
The “If” Conditional
The first parameter on each command line can be an “Always” clause, an “If” conditional, or an “Else”
clause.
If there is more than one line, the last line will always contain an “Else” clause.
The “Always” or
“Else” clauses do not have conditionals. There are two options for an “If” conditional:
•
If Output 1 is enabled for video output
•
If Output 2 is enabled for video output
The “then” Clause
The second parameter is the “then” clause. If the “If” conditional is true the “Then” clause is used,
otherwise control is passed to the next command line. The options are:
•
User Defined
•
Pass-through audio EDID from Output 1
•
Pass-through audio EDID from Output 2
•
Pass-through the common audio modes from Output 1 and Output 2
Default Audio Configuration:
This means:
•
If output 1 is enabled for video output, and it’s EDID shows that it has audio capability, then pass
it’s audio EDID back to the HDMI sources.
•
If this is not true, then set the EDID to the audio formats selected by the user.
•
Because an HDMI device should not output audio to a particular output if it is beyond the capability
of the device attached to that output, each line has a user selectable field to independently enable
each audio output. These fields cover HDMI output 1, HDMI output 2 and the digital COAX audio
outputs. So the default case has HDMI output 1 and COAX audio turned on for line one. Only the
COAX audio output is turned on for line 2. You should change these settings to match your system.
Audio Example 1
A single line case with “User EDID” is shown below.
When you set the audio EDID to “User EDID,” a “User EDID settings” menu will open (this is the “PCM 2 Ch
48KHz Y” entry below). You can use the “User EDID settings” menu to select which audio modes will be
advertised by the audio EDID. By default 2-channel PCM and DD 5.1 are enabled. Other modes must be
enabled using the menu commands.
Audio Example 2
Output 1 drives a projector, which doesn’t have audio capability (or it’s not used) and instead the COAX
audio output is used. Output 2 drives a second display, which has audio capability and uses HDMI audio.
When the second output is used, the video configuration is set to enable output2, and disable output 1. This
type of setup might have the two displays in different rooms with different equipment. This can be set as:
