digital audio
modular
processing system
C8000
4/8/16 channels DSP with SDI & system-bus I/O
C8492(B)
page
22/30
Mode
[Primary / Secondary / AUTO / AUTO no Upmix]
You can select between one of the 2ch inputs and the auto mode and
auto mode with upmix disabled (e.g. for path through of
announcements).
Dual Mono
[OFF / AUTO]
If the fail over input is fed by a dual mono signal, the circuit may
automatically copy the opposite one if one fails.
Fail Threshold (dBFS) [-60 … -40]
Trigger threshold for the fail detector.
Fail Wait (s)
[1.5 … 10.0]
Time from detection of an audio loss to the moment of switch over.
Fail Return (s)
[0.0 … 10.0]
Time from detection of an audio loss until switch back.
Side Chain Filter
[ON / OFF]
A high pass filter (300 Hz) and a low pass filter (3000 Hz) is applied to
the detector side chain (not the audio path) to prevent hum and noise
from blocking fail over switching.
Surround Detect
To perform an automatic upmix in case the main surround fails.
Switch
[AUTO / FIX Surround / FIX Upmix]
The surround switch may be permanently [FIX] connected to the
surround input or the upmix output but it may also perform an [AUTO]
switch over in case the surround input fails.
Detection
[Center / Surround / Center or Surround / Signal loss]
Here you can decide which channels must be observed for signal loss
to operate the surround switch.
Fail Threshold (dBFS) [-80 … -70 … -40]
If the RMS weighted input level drops below this value a fail signal will
be generated.
Fail Wait (s)
[0.0 … 10.0]
Time from detection of an audio loss to the moment of switch over.
The return from the fail condition (in case surround comes back) will
be immediate.
Downmix
Out Gain (dB)
[-20 … 0 … 20]
Center Mix Level (dB) [-12.0 … -3.0 … 0.0]
Surround Mix Level
[-12.0 … -3.0 … 0.0]
(dB)
Options
Latency Compensation [OFF / ON]
Since the upmix has a certain latency (see Upmix > Processing Time)
it can be compensated automatically for the stereo pair to avoid lip
sync issues between an upmixed surround and the stereo path.
Failover D (Stereo)
Mode
[Prinmary / Secondary / AUTO]
The second fail over circuit can take the downmix as a fail over source
in case the input signal fails. But it may simply put the downmix
through permanently (Mode switch is set to Secondary).
The other parameters are already described in the DSP 1B section.
