Bedienungsanleitung Aspi EF1210 (Seite 61 von 112) (Englisch)

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EF1210 C

OMMAND

EFERENCE

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 59

AECS

SET

SUPPRESSION

MODE

CHANNEL

NORMAL

AGGRESSIVE

Suppression Level

Selection

The EF1210 has been designed and carefully optimized to provide the best possible

balance between removing as much vestigial echo as possible and maintaining natu-

ral, full-duplex performance when both parties speak at the same time or one party

tries to interrupt the other. As designed, the EF1210 should have no difficulty com-

pletely removing audible echo and adapting almost instantaneously to movements

and level changes within the room as long as the EF1210 is set up correctly. How-

ever, it is possible that some room environments may be so harsh as to strain the

boundaries of the operation of the EF1210. This may occur if the room is exceed-

ingly reverberant, the room acoustic gain limit is exceeded, or there is an excessive

amount of background room noise which results in a low signal-to-noise ratio on both

local speech and echo signals.

In conditions of excessive background noise, the signal-to-noise ratio of the local

speech signal can drop so low as make the conferencing system virtually unusable. In

such conditions, it is difficult for the AEC to cancel echoes much below the noise

floor. While the EF1210’s superior noise cancellation subsystem can reduce the

objectionable audible impact of high room noise to make the conferencing experience

more enjoyable and less fatiguing, in certain very harsh conditions this may mean that

the residual echo is now more audible because the noise floor has been so dramati-

cally reduced.

Another difficult situation for the EF1210 arises when the room acoustic gain limit is

approached or exceeded. As the acoustic gain limit is approached, it becomes more

difficult for the EF1210 to adapt to level changes or movement in the room (including

normal conferencing participant movement, movement of papers, etc.) as a result of

which snippets of echo may be heard for longer periods than would be desirable.

Should it be necessary to operate the EF1210 in such hostile conditions, the echo sup-

pression performance of the EF1210 may be enhanced to remove any vestigial traces

of echo, at the expense of doubletalk performance. In aggressive suppression mode,

users on the remote end will hear dropouts and clipping artifacts when they attempt to

talk across a local participant. The AECSn command may be used to select either

normal suppression mode (default) or aggressive suppression mode if required by

harsh room conditions.

The factory default setting for AECS

is 0 (normal).

Remote Commands

The following commands can be sent by the remote control device to set the suppres-

sion mode level.

Remote Command Effects

AECS

x Set suppression mode on channel n to x.

x is the noise suppression mode (0 = normal; 1 =

aggressive).

AECS

? Request AECS status for channel n.

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Aspi EF1210 Seite 61

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