Bedienungsanleitung Aspi EF1210 (Seite 48 von 112) (Englisch)

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EF1210 U

SER

ANUAL

ETER

, this indicates a possible problem with the acoustic gain on that microphone

channel.

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 R

EMOTE

IGNAL

EVEL

ETER

Excessive

Microphone

Amplification

For the EF1210 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.

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

of the room acoustics. In this situation, the EF1210 cannot effectively cancel room

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

Excessive microphone amplification also increases acoustic gain (See “Acoustic Gain

Failure” on page 45.). You can check for excessive microphone amplification by

observing the front panel I

NPUT

EVEL

NDICATOR

during a normal conference. The

first yellow LED should illuminate frequently. If the second yellow LED is illumi-

nated 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 EF1210 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 EF1210’s ability to adapt and cancel echoes is compromised.

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

Note.

Before you readjust the Remote input levels, check to make sure

you are looking at the correct remote input level (AEC A or AEC

B) on the R

EMOTE

EVEL

NDICATOR

. Check to make sure that the

microphone that you are looking at is in the zone that you think it

is in and that you are looking at the correct channel on the I

NPUT

EVEL

NDICATOR

Note.

Before you readjust the microphone input levels, check to make

sure you are looking at the correct channel on the I

NPUT

EVEL

NDICATOR

. Check also to make sure that you are looking at the

correct corresponding reference input level on the R

EMOTE

EVEL

NDICATOR

Note.

If you adjust the M

INE

NPUT

level, you will affect the acoustic

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

exceeded. See “Check Acoustic Gain” on page 31.

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