System Block Diagrams - Polycom EF2201 Brochure & Specs

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While the Vortex performs a large variety of complex tasks, the control and implementation of these tasks is very simple to the
user. The simplicity comes from the Conference Composer Windows™ software and the elegant design of the Vortex hardware.
The power of the digital signal processors has allowed our engineers to design an echo canceller that has full bandwidth – not
limited to only 7kHz or even 15kHz. With the Vortex, conferencing can now sound as good as the face-to-face experience. By
designing the system this way, all the program audio and other sound reinforcement audio will have 22kHz audio bandwidth. This
opens up the possibility of full bandwidth audio conferencing over broadband connections.
In its simplest form, the Vortex is an automatic microphone mixer with full cross point matrix. All the microphone parameters can
be customized and any input can be mapped to any output with an arbitrary gain applied to the cross point. Adjustments in levels,
matrix cross points, and other functions can be made in one of three ways: RS-232 control via the Conference Composer software
or a dedicated control system, the logic input pins, and the front panel buttons and LCD.
In reality, the product is much more than an automatic microphone mixer, it includes automatic gain control for automatically
leveling the microphone input signals, noise cancellation for reducing the amount of ambient noise picked up by the microphones,
acoustic echo cancellation for removing the echo of the remote talkers voice from being sent back to them, and many other
features that are detailed in the block diagram in Figure 2 and Figure 4.
Figure 2. Block diagram of the Vortex.
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