Manual Aspi EF1210 (page 49 of 112) (English)

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ROUBLESHOOTING

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 47

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 EF1210 in canceling echoes.

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

NPUT

EVEL

NDICATOR

during normal conferencing conversation. The first yellow

LED should illuminate frequently. If the I

NPUT

EVEL

NDICATOR

never illuminates

beyond one or two green LEDs during normal speech, increase the microphone’s

input level.

Loudspeaker

Nonlinearity

Overdriving the loudspeaker may distort the zone output signal and cause ineffective

AEC operation. The EF1210 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, the acoustic reflections picked up by the microphone

do not match the signal fed to the loudspeaker. They are distorted copies of this sig-

nal. The EF1210 cannot effectively cancel this distorted signal.

If you suspect the loudspeaker is introducing nonlinearities into the room acoustic

path, take these steps to minimize its influence on the echo canceller.

• Keep the loudspeaker’s volume level at less than three-eighths of full scale. If

higher volume is required, the EF1210 should operate effectively at volume set-

tings of up to 50 percent of full scale. At more than 50 percent, most audio sys-

tems and loudspeakers introduce significant nonlinearities. The EF1210 may not

adapt under these conditions, and echoes may be heard.

• If the loudspeaker has a bass control, lower it. Excessive bass can cause a boomy

effect that is nonlinear. In addition, excessive bass may cause substantial

mechanical coupling to the microphone through vibrations induced in the hous-

ings and support structures.

• Increase the separation distance between microphones and the loudspeaker. The

EF1210 handles up to 10 dB of acoustic gain between the loudspeaker and the

microphone. You may be exceeding this limit if the loudspeaker is pointed

directly at the microphones or if the loudspeaker volume is excessive (loud-

speaker placement is not critical, but it should not be pointed directly at the

microphones).

EMOTE

ONTROL

ROBLEMS

If the remote control device doesn’t seem to be affecting the EF1210, there are a few

things you can check. Try sending commands that have a visible impact, like the

MUTEI command (muting all channels will cause the M

UTE

LED to light). Also,

look for messages from the EF1210, like acknowledgment or error messages, if the

remote control device can display them.

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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Aspi EF1210 Manual

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