DeTaIleD COnfIGuraTIOn anD referenCe |
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LED Meter Channel Selection
Selects the audio that will be indicated on the LED meters.
♦
Studio 1&2
(default) – Livewire Input and output
♦
Phone 1&2
– Send and receive to/from hybrids 1 & 2
♦
POH in
– The Program on Hold input
Phone Send Gain Adjustment
This setting adjusts the level of the hybrid into the telephone line, after the send limiter, and is calibrated
with 0dB representing the usual send level into the line.
The default is 0dB, which should be OK for most telephone lines. If callers consistently complain about low
audio level and you have verified that this is a problem, you can increase the send level. However, doing so
can reduce effective hybrid performance and increase leakage. Conversely, lowering this setting can reduce
leakage.
Call Ducking Level
This control adjusts the amount of ducking that occurs to the received telephone audio when send-to-caller
audio is present. A value of
Full Duplex
means that the telephone audio is never ducked or attenuated, while
Half Duplex
applies maximum attenuation when send audio is present. Intermediate settings range from -1
to -15dB. Ducking is desirable for a variety of reasons:
♦
Allows the announcer to override the caller by causing the received caller audio to be attenuated
(ducked) when the announcer speaks. This is often desired for aesthetic effect and allows the
announcer to remain in control of the conversation.
♦
Dynamically improves effective trans-hybrid loss to reduce leakage, when necessary.
There is also a ducking of the announcer audio to the caller. This is only a few dB unless Feedback Reduction
is enabled, as described below. This send ducker has a fixed value.
Receive AGC
The receive Automatic Gain Control serves to improve level consistency of caller audio. Nominal levels of
the telephone network vary as much as 30dB from call to call. In the past decade our experience has been
that loud calls have become just as much a problem as low level callers.
Therefore we have changed the AGC to act as a platform leveler. The iQ6 uses a dB-linear approach to AGC
with a feed-forward topology, which provides a consistent sound regardless of the drive level. This “smart
compressor” normalizes levels while retaining the natural dynamics of the caller’s voice.
This selection controls the “aggressiveness” of the AGC process, taking values from
OFF
,
1/4
,
1/2
,
3/4
to
FULL
. We suggest you start with the default value,
FULL
.
Aggressive AGC is more noticeable, but is also more effective at maintaining consistent levels. Adjustment
of this setting simultaneously changes a number of parameters within the AGC function, such as attack &
release times, thresholds, and compression ratio.
An important feature of the iQ6’s AGC is that it is cross-coupled to other sections of the hybrid so that it can
reliably distinguish between the real caller audio and residual hybrid leakage. This allows a lot of gain on
low level callers while preserving excellent hybrid performance.
