TELOS 2101 USER’S MANUAL
PART IV
THE STUDIO INTERFACE & ADDITIONAL HYBRIDS
IV-86
SECTION 3 – STUDIO INTERFACE: DETAILED CONFIGURATION & REFERENCE
The Digital Dynamic EQ uses the Rcv EQ values (see below) as “target levels”. This allows
you to customize the quality of the sound, but still get a consistent quality to the audio from
caller to caller. Otherwise, the functioning is the same as Adaptive.
3.5.3
Duplex “Ducking” System
The ducking functions occur on both the send and caller audio. This function is important for
several reasons:
•
Provides an “aesthetic” control over the caller that many programmers prefer. When
the announcer speaks, the caller is ducked, or reduced in volume dynamically. This is
particularly true when the caller is “carrying on” and the programmer wishes to get a
“word in edgewise” so the show can continue.
•
Reduces feedback when a loudspeaker is necessary. Because the ducking system
operates on both audio paths, and because we designed it to be symmetrical in its
gain reduction action, the “feedback gain” is kept constant and is reduced by the
amount of the ducking level selected.
•
In the loudspeaker case, reduces audibility of the caller signal that couples through
the acoustic path, into the microphones, and is returned the caller resulting in a more
natural sound for the caller.
The duplex system inserts a controlled loss (ducking) into whichever audio path (send or
receive) is not active at the moment. When the caller is speaking, this loss is inserted in the
announcer path, when the announcer is speaking the loss is inserted in the caller gain is
reduced. The effect is somewhat “seesaw-like” with the total loss always being constant.
As a guideline, you will need a lower DuplexLevel setting when using open speakers. This
helps reduce the occurrence of feedback and also reduces the chances of the caller hearing
themself via the speaker to mic path which has an “unnatural” quality and can be disturbing.
In a “morning zoo” type of scenario the setting should be even lower as there will be multiple
mics used with open speakers. Fortunately, this scenario coincides with a more duplex style
of operating – where pre-recorded “bits” may be played to callers and must be heard without
interruption. The default setting is 10.
You may choose how much of this effect you prefer, from HALF (0) which makes the
system operate like a “one way at a time” speakerphone to FULL (16) which disables
ducking. A typical value for many applications would be in the range of 8-12.
3.5.4
Feedback Control
We’ve carefully designed the Studio Interface so that problems with feedback should be rare.
However, despite excellent trans-hybrid loss and a number of other features, you can
probably induce feedback if you try sufficiently hard (try cranking up your studio monitors).
Some suggestions for what you should do if feedback does occur follow:
•
Adjust the DuplexLevel selection in the Audio Menu to a lower setting
•
When mic processing is used, connect the hybrid in such a way that it gets an
unprocessed mic signal. Our Omnia ToolVox microphone processor has an output
just for this purpose.
