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4K60 HDMI Input & Output Boards
93
Enova Digital Media Switchers - Hardware Reference Manual
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).
Audio Troubleshooting (Cont.)
Problem
System Type
Solution
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.
Audio Switching Boards
(ASB or ASB-DAN)
1. It is recommended that you set up all 2-channel-PCM-only
sinks to use switched audio.
2.Use the audio Downmix channel to deliver audio to your 2-
channel only output devices. See
for information on how
to set up and route your downmix channel.
n. OUTPUT SIDE ISSUE
- Audio is not
present with good video
due to the
output channel's Audio Configuration
settings.
Audio Switching Boards
(ASB or ASB-DAN)
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.
3. Verify that the
Output Volume
is set to 100%. If it is not set to
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.
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.
No Audio Boards or AIE
Board(s)
See
1.c.
above.
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.
Audio Switching Boards (ASB
or ASB-DAN)
Switched Only
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.
See
the Configuring/Switching the Down-mix Signal
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.
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.
Audio Switching Boards (ASB
or ASB-DAN)
Embedded Only
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.
2. In the
General
sub-section, click on the
Switched
button
below
Audio Routing.
This will eliminate the hiss.
3. See the
Configuring/Switching the Down-mix Signal
on page 188 for information on how to set up and route your
downmix channel.
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.
ASB Switched Downmix Audio
ASB-D Switched Downmix
Audio
Reboot audio output board from the System Configuration
Interface's Status page.
Note: this will kill all switched audio on the entire system for a
few seconds.
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.,
).
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.