Polycom Vortex EF2280 Reference Manual

TROUBLESHOOTING
VORTEX EF2280 Reference Manual 42 Technical Support: 800.765.9266
• Using the Adaptive Gate Threshold is recommended for more accurate
gating.
M ATRIX M IXER
Don’t hear output • Make sure the output is not muted.
• Check that the input you’re expecting to hear is included in the output
that you’re listening to.
• Make sure safety mute is turned off.
E CHO C ANCELLER R EFERENCE
Room Audio
Sounds Choppy
If you hear the local room’s audio from the loudspeakers and it sounds
choppy, you may have included the room’s microphones in the echo canceller
reference. The echo canceller reference should NOT include the local room’s
microphones -- it should only contain the remote end’s audio and program
audio. You can still add the local room’s microphones to the local output with
the matrix, but do not add them to the echo canceller reference. For more
specific guidelines on what to include in your echo canceller reference, see
“Build Your Echo Canceller Reference” on page 31.
R ESIDUAL E CHO
You may hear residual echo if system levels are not set properly. Improper
level settings anywhere in the audio path can introduce nonlinearities that
hamper the operation of the EF2280. If you hear residual echo, one of the fol-
lowing conditions may be causing the problem.
Reverberation vs.
Acoustic Echo
Do not confuse the residual echo of remote speech with the reverberation of
local speech. Reverberation of local speech is caused when the speech signal
arrives at the microphone via several paths (the direct path and multiple
reflections from surfaces in the room). This is a local room phenomenon that
gives the talker’s voice a hollow or resonant sound (as heard at the remote
end).

Polycom Vortex EF2280 Specifications

General

Rack capacity	1U
Frequency range	20 - 20000 Hz
Cancellation span	270 ms
Echo cancellation	65 dB
Phantom power	48 V
Nominal input level	0 dB
Output gain	-100 - 20 dB
Output impedance	33 Ω
Maximum output amplitude	23 dB
RS-232 ports	1
Audio connections	2 x 3.5mm
Parallel ports quantity	2
Input voltage	110 - 240 V
Output current	20 mA
Output voltage	5 V
Input frequency	47/63 Hz
Power consumption (typical)	30 W
Operating temperature (T-T)	0 - 40 °C

Weight and Dimensions

Weight	1800 g
Dimensions (WxDxH)	483 x 244 x 45 mm