ClearOne Converge Pro, Руководство пользователя

Страница: 22 / 48

16 www.clearone.com
CHAPTeR 4: INPUTS AND OUTPUTS
miC\LiNe iNPUTs
balanced audio is input at the rear panel Phoenix connector. Mic or line level is selected and phantom power is provided
(if required). Converge Pro devices convert input audio from analog to digital for processing by the DSP engine. Once
converted to digital, audio level is controlled. This function, along with all other functions, can be adjusted via local or
remote external control interfaces, or PCs connected via USb, network, or RS- 232 port. This provides real-time volume
control, muting, etc. Minimum and maximum levels can also be set to limit the range of gain to suit audio requirements.
The acoustic echo canceller and noise canceller is the first option in the audio signal flow. Here, you set the echo
cancellation reference, non-linear processing (optional), and meters reflecting echo cancellation activity. You can also
enable the noise canceller and depth of cancellation. A second audio path exists that takes the input signal before the
AeC and noise cancellation stages and routes it to the matrix via a second set of filters, AGC, AlC and auto-mixing
functions. The settings of the filters, AGC, AlC and auto-mixing functions mirror the setting of the primary audio path with
echo cancellation and noise cancellation. The pre-AeC channel provides an audio signal that has not been altered in any
way by the AeC, NlP or noise cancellation and has a lower latency, less then 4ms.
(Figure 4.1)
Coarse Gain
Fine Gain
A/D
AEC
NC
Pre-AEC
Channel
Signal Processing
Signal Processing
GATE
GATE
Mirrors the Settings of
the Primary Signal Path
To
Matrix
Mixer
None-Gated
Gated
PRE-AEC
Figure 4.1
Next, four configurable filters can each be set individually or in any combination. each may be activated to equalize
different microphones to sound similar, filter out unwanted hum, etc. You can increase or decrease each band up to
15db, in increments of .5db for each input.
The next option is AGC and AlC. AlC automatically adjusts microphone levels to ensure participants’ voices are heard
at a consistent level regardless of whether people are speaking loudly or softly. AlC is simply turned on or off. AGC
also provides a consistent level but unlike the AlC, the operation parameters can be adjusted. AGC and AlC cannot be
operated simultaneously.