Bedienungsanleitung Polycom Vortex EF2280 (Seite 43 von 62) (Englisch)

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TROUBLESHOOTING

Nonlinear distortion causes a degradation or divergence of the AEC’s internal model

of the room acoustics. In this situation, the EF2280 cannot effectively cancel room

echoes and a substantial amount of echo may be heard by the remote party.

Excessive microphone amplification also increases room gain (See “Excessive Room

Gain” on page 39.). You can check for excessive microphone amplification by

observing the front panel L

EVEL INDICATOR during a normal conference. The first

yellow LED should illuminate frequently. If the second yellow LED is illuminated

constantly during normal speech or if the red LED illuminates or even flickers, reduce

the microphone input level.

Insufficient

Microphone

Amplification

Grossly insufficient microphone gain degrades EF2280 performance and weakens the

out-bound speech power level. This has the effect of reducing the signal-to-noise

ratio of the microphone signal, which is analogous to raising the background noise

level in the room. Because this noise is uncorrelated with the echoes within the room,

the EF2280’s ability to adapt and cancel echoes will be less than optimal.

A second effect of insufficient microphone gain is that the power of the microphone

input signal may be substantially lower than that of the remote input signal. This

reduces the ability of the decision logic to determine whether the AEC should be in

transmit, receive, or double-talk mode. This effect may reduce the effectiveness of

the EF2280 in canceling echoes.

You can check for insufficient microphone amplification by observing the front panel

EVEL INDICATOR during normal conferencing conversation. The first yellow LED

should illuminate frequently. If the L

EVEL INDICATOR never illuminates beyond one

or two green LEDs during normal speech, increase the microphone’s input level.

Nonlinearity Overdriving the loudspeaker or inserting a dynamics processor before the EF2280

may distort the signal that the microphones see causing ineffective AEC operation.

The EF2280 relies on the linearity of the acoustic feedback path — D/A, amplifier,

loudspeaker, microphone, and A/D — to cancel acoustic echoes. If you overdrive the

loudspeaker or insert a dynamics processor before the echo canceller, the acoustic

reflections picked up by the microphone do not match the signal fed to the loud-

speaker. They are distorted copies of this signal. The EF2280 cannot effectively can-

cel this distorted signal.

Note. Before you readjust the microphone input levels, check to

make sure you are looking at the correct channel on the L

EVEL

NDICATOR.

Note. If you adjust the MIC/LINE INPUT level, you will affect the

room gain. Check to make sure that the room gain limit is not

exceeded. See “Verify Room Gain” on page 13.

Note. Before you readjust the microphone input levels, check to

make sure you are looking at the correct channel on the L

EVEL

NDICATOR.

Note. If you adjust the MIC/LINE INPUT level, you will affect the

room gain. Check to make sure that the room gain limit is not

exceeded. See “Room Gain” on page 38.

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