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Linear Acoustic AERO.qc User Guide
(i.e. an AES signal with silent audio), or an AES signal with audio. The unit will NOT ac-
cept word clock or video reference signals. Note that in addition to the AES Ref In, refer-
ence can be derived from Main Input 1, SDI and Internal within the I/O Options menu
(see Chapter 4).
6.1.3
Output Audio Clicks and Pops
This could indicate that the AES Reference is missing or at the wrong sample rate (the unit
expects to be locked to 48kHz). The unit is designed to default to an internal 48kHz ref-
erence in case the external reference is removed. This allows audio to continue, but due to
the sample rate converters present on each input pair, the outputs will be asynchronous
with the inputs. The solution is to make sure that the reference is connected.
It could also mean that audio applied to the unit is not properly referenced, or that the
equipment that the AERO.qc is feeding is not properly referenced. Using the master by-
pass function of the unit is a helpful way to troubleshoot this issue.
6.1.4
Audio Sounds Strange
Reports of audio that sounds like it is in a tunnel indicate timing issues between the channel
pairs. Most often viewers watching in stereo will be the first to notice such problems. Some
suggestions include making sure that the delay settings in the AERO.qc are all equal (if they
are intended to be so). Offsets as small as a couple of milliseconds may quickly become
audible under the right conditions.
Another suggestion applies to those who decode network audio using a Dolby DP564 AC-
3 decoder. There is a monitoring mode that allows the analog and digital outputs to be
used. This can inject 10msec of delay into the surround channel audio which will cause
complaints. The correct setting is either to have the unit in so-called "Bypass Mode" or to
set the monitoring mode to "Digital."
6.1.5
Audio Issues Disappear In Bypass
This can be caused by a number of things, including the fact that a processor like AERO.qc
can apply a great deal of gain to incoming signals. Things that would not normally be au-
dible quickly get pulled out of the background.
We recommend taking a good hard listen to station audio. Hums, buzzes, clicks, pops,
phase issues, frequency response problems, bass build-up on the news set, etc... will all be
amplified in varying degrees and can ruin otherwise excellent programming.
As with all traditional processing, the input audio should be immaculately clean else it
might be made worse- and the difference now is that it will sound bad in surround!
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Troubleshooting
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