Bedienungsanleitung Polycom Vortex EF2280 (Seite 42 von 62) (Englisch)

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TROUBLESHOOTING

VORTEX EF2280 Reference Manual 40 Technical Support: 800.932.2774

talker to the microphone. The microphone audio will most likely also be muddy

and reverberant. The installer or user may try to solve these microphone audio

quality problems by turning up the microphone amplification, thus adding to the

room gain. This problem can be remedied by proper microphone selection

(pickup pattern, directionality) and placement, coupled with proper microphone

input calibration.

3. A third common cause of room gain problems is excessive coupling between

loudspeaker audio and microphones. This can be addressed by reducing the

microphone coupling, either by positioning microphones so that their pickup pat-

terns are biased away from the loudspeaker audio (and direct reflections of loud-

speaker audio), repositioning loudspeakers, or reducing the loudspeaker

amplification.

In summary, any amplification applied between the reference input and the micro-

phone inputs can add to room gain problems. To avoid problems, ensure that the Ref-

erence input signal is not too low, and the microphone input signals are not too high.

Run the built-in EF2280 Room Gain test to verify that you do not have room gain

problems (See “Verify Room Gain” on page 13).

In-Conference

Quick Check

If you experience residual echo problems during a conference, you can quickly check

that the reference and microphone levels are calibrated and not causing room gain

problems by using the Room Gain parameter (See “Verify Room Gain” on page 13).

If this excessive coupling activity level is evident on only one microphone input chan-

nel, that microphone channel should either be redirected to reduce coupling to loud-

speaker audio, or recalibrated as it will need to be turned down. If the excessive

coupling activity is observed on all (or most) microphone channels, then this indicates

either that the room audio is too loud or the reference signal may need to be recali-

brated (this will be indicated by observing low activity levels on the S

IGNAL LEVEL

ETER).

Excessive

Microphone

Amplification

For the EF2280 to adapt effectively, saturation (overload or clipping) must not occur

at the A/D converter supplying the microphone input. Saturation introduces nonlin-

ear signal distortions into what the AEC expects is a linearly echoed version of the

remote speech.

OMMON CAUSES OF EXCESSIVE

OOM GAIN

REMEDY

Excessive remote (reference) input

amplification

Apply enough gain to the codec, phone

or program audio inputs which will

make up the Reference input signal.

Excessive microphone amplification Select proper microphones for talker

distance according to pickup pattern

and directionality and properly cali-

brate mic inputs.

Excessive coupling between loud-

speaker audio and microphones

Reduce mic coupling by repositioning

mics or loudspeakers, or by reducing

loudspeaker amplification.

Table 4: Summary of Excessive Room Gain.

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