AMX Enova DGX 100 Series Hardware Reference Manual page 93

Audio Troubleshooting (Cont.)
Problem
m. OUTPUT SIDE ISSUE - Audio is not
present on 2-channel sink (TV/monitor)
with good video while it is present on a
multi-channel sink (AVR or TV/monitor
that supports multi-channel audio
formats). Most likely due to source's use
of non-PCM source audio format with a
DxLink Receiver analog output port's
PCM 2-channel requirement.
n. OUTPUT SIDE ISSUE - Audio is not
present with good video due to the
output channel's Audio Configuration
settings.
2. Audio sounds like a rattlesnake or all hiss.
a. Occurs when you have a mismatch
between the audio source and the audio
output devices capabilities, such that
the source is sending Dolby Digital or DTS
compressed audio to a device that
can't uncompress it, e.g. a 2-ch PCM
device.
AIE
You can get this sound if you are
attempting to extract compressed
audio, which is not a supported
operation.
b. Occurs when you have a mismatch
between the audio source and the audio
output devices capabilities, such that
the source is sending Dolby Digital or DTS
compressed audio to a device that
can't uncompress it, e.g. a 2-ch PCM
device.
c. Occurs when you have a mismatch
between the audio source and the audio
output devices capabilities, such that
the source is sending Dolby Digital or DTS
compressed audio to a device that
can't uncompress it, e.g. a 2-ch PCM
device.
Other Audio issues
INPUT SIDE ISSUE - Downmix audio is not
present with good video.
Assuming you have gone through
problem determination steps 1 a & b
above, and you have determined that
problem with the down mix input.
Verifying an output devices capabilities as communicated by its EDID
An output device communicate its audio and video format capabilities to the source device via it's EDID.
To check if a destination supports a particular type of audio format, capture the EDID using the System Configuration Interface's Save
EDID function and then paste the data from the .edid file into an EDID reader program (e.g., www.edidreader.com).
The audio capabilities data is in Block 1 under the Audio Data Block and the Speaker Allocation Data sections.
If the device only supports 2-channel LPCM, this will be the only audio referenced in this Audio Data Block.
NOTE:
Other audio troubleshooting problems and solution can be found in the audio boards chapters specific to: Enova
DGX Dante™ Audio Switching Boards (page 150), Enova DGX Audio Switching Boards (page 164), and Enova DGX Audio
Insert/Extract Boards (page 175).
Enova Digital Media Switchers - Hardware Reference Manual
System Type Solution
1. It is recommended that you set up all 2-channel-PCM-only
sinks to use switched audio.
Audio Switching Boards
2.Use the audio Downmix channel to deliver audio to your 2-
(ASB or ASB-DAN)
channel only output devices. See Configuring/Switching the
Down-mix Signal section on page 188 for information on how
to set up and route your downmix channel.
1. Select the output channel with no audio and the select the
Audio configuration tab.
2. Verify that Mute is not checked. If it is checked, uncheck it.
Audio Switching Boards
3. Verify that the Output Volume is set to 100%. If it is not set to
(ASB or ASB-DAN)
100%, note its current setting and slide it to 100% to see if you
get any audio. If you don't get any audio, you can return it to
its prior setting. If you do, then adjust it to a new desired
setting.
No Audio Boards or AIE
See 1.c. above.
Board(s)
The Audio Switching Board sub-system suppresses any non-2-
channel audio for the audio switching sub-system, so that you
should rarely hear this and if you do, it will be extremely brief.
Audio Switching Boards (ASB See the Configuring/Switching the Down-mix Signal section
or ASB-DAN) Switched Only on page 188 for information on how to set up and route your
downmix channel to get good audio to this channel.
If you want to force your source to only put out 2-channel
PCM audio, see 1.c. above.
Use the System Configuration Interface's Configuration page
for the output channel to use switched audio by:
1. Selecting the output channel and then the Audio tab on
configuration side of the page.
Audio Switching Boards (ASB
2. In the General sub-section, click on the Switched button
or ASB-DAN) Embedded Only
below Audio Routing. This will eliminate the hiss.
3. See the Configuring/Switching the Down-mix Signal section
on page 188 for information on how to set up and route your
downmix channel.
Reboot audio output board from the System Configuration
ASB Switched Downmix Audio
Interface's Status page.
ASB-D Switched Downmix
Note: this will kill all switched audio on the entire system for a
Audio
few seconds.
4K60 HDMI Input & Output Boards
93