junger T-AP, Manual, Page: 40 / 68

T*AP
36
setup GUI – AUDIO PROCESSOR – Upmix & 2ch Fail Over (5.1+2 program configuration)
Jünger Audio has developed its own
proprietary 5.1 upmix algorithm to get a good
quality surround image from a stereo input
signal. This is a real-time process which does
a frequency analysis of the input signal. As
known from the mathematical theory, the
longer the time for such an analysis the better
the result. But this will introduce more delay
for the audio path, compared to the video.
This delay, if acceptable in general, may be
compensated by the video delay of the SDI
embedder.
You may take the upmix source signal from
either the surround Left/Right input (in case it
provides stereo PCM instead of surround
L/R) or from pre-selectable inputs (2L/2R or
AUX).
The Surround Detect circuit observes the
input channels to decide if the surround
signal has disappeared in order to do an
automatic upmix if desired. But the upmix
may also be forced by an event of the system
that loads a preset configuration.
Downmix
Out Gain (dB) output gain of the downmix signal [-20.0 … 20.0]
Center Mix level (dB) [0.0 … -12.0]
Surround Mix Level (dB) [0.0 … -12.0]
Fail Over Upmix switch that provides the upmix block with an input signal for upmix or
pass through if the source is not intended do be used for upmixing.
Mode the switch may be permanently [FIX]
connected with either the 1L/1R, 2L/2R or
AUX input but it may also perform an [AUTO]
switch over from 1L/1R to AUX or 1L/1R to
2L/2R if the first signal fails.
Both options may also be set to turn the
upmix off [no Upmix] if the switch over takes
place.
Fail Threshold (dBFS) [-60 … -40]
Fail Wait (s) [1.5 … 10.0]
Fail Return (s) [0.0 … 10.0]
Side Chain Filter [OFF / ON] 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.