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INTRODUCTION
© Polycom, Inc. 3 VORTEX EF2241 Reference Manual
busses equals 12 inputs), and 2 mixes of the P Bus for the telephone. The 23 x 17
main matrix has the following outputs: Outputs 1-4 and A-D, AEC Reference 1 and 2,
W, X, Y, and Z outputs to the digital expansion bus, P output to the digital expansion
bus, output to the power amplifier, and output to the phone line. The EF2241 has 24
bit resolution, 32-bit floating point computation, and a 48 kHz sampling rate.
Polycom’s proprietary noise cancellation on each of the 4 mic/line inputs and the tele-
phone line helps to keep overall ambient noise to a minimum. Polycom echo cancel-
lers are the only ones on the market to feature this patented technology. Noise
cancellation filters out ambient background noise such as noise from heating, venti-
lating and air conditioning (HVAC), LCD projectors, and road noise. Our noise can-
cellation technology is not a noise gate. It actually removes noise. Therefore, it
enhances the operation and improves the sound quality of an automixer, for example,
by preventing it from bringing the noise level up and down when microphones are
gated on and off. By cancelling the noise picked up by each microphone, the overall
signal to noise ratio (SNR) is preserved. The result is crystal clear speech over a
greater decibel range than any other echo canceller. That means reduced listener
fatigue and a higher quality audio conference.
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P
RODUCT
F
EATURES
Product • Front panel LCD for controlling and configuring the product without a computer
• 5-band equalizer on all Inputs and Outputs
• Echo cancellation on Inputs 1-4
• Noise cancellation up to 15 dB
• Two internal automatic microphone mixers for Inputs 1-4
• 23 x 17 full cross point matrix mixer with expansion bus
• Internal signal generator for calibration mode and noise masking applications
• 2 year warranty
AEC • 24 bit resolution
• 48 kHz sampling rate, >20 kHz bandwidth
• 270 ms AEC tail length
• 40 dB/sec convergence rate
• Can function in rooms with more than 10 dB of room gain
LEC • 32 ms LEC tail length
• 40 dB/sec convergence rate
• > 65 dB total cancellation