Polycom EF2201 Brochure & Specs page 20

EN (Echo Canceller, Noise Canceller)
Ungated
Echo Noise
AGC PEQ Mute Gate
Gated
Canceller Canceller
On Off On Off On Off
Parameters Parameters
EC1, EC2, Bus
Figure 4. The channel processors for each of the 1-8 mic/line inputs.
Each of the 8 mic/line inputs has the EN processing block that is shown in Figure 3. The balanced input signal passes through a
digitally controlled, analog gain stage, is converted to a digital signal and then processed by the acoustic echo canceller, the noise
canceller, the automatic gain control, the parametric equalizer, and then the automatic mixer. The details of the processing are
described in the next section.
Vortex Front and Rear Panels
1 2 3 4 5 6 7 8
Figure 6. The product front and rear panels.
Figure 6 shows the front and rear panels of the Vortex along with numeric pointers for understanding what the different connectors
are. Rack ears are built into the Vortex enclosure design.
The features of the Vortex are described below:
1. LCD Display. Displays menu instructions for configuration and operation of the Vortex.
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