Asus Xonar D2X User Manual download pdf (Page 53)

ASUS Xonar D2X

6.7 AEC (Acoustic Echo Cancellation)

Xonar D2X provides advanced Acoustic Echo Cancellation (AEC) for best voice

communication quality over your speakers. AEC technology can eliminate up-to-

40dB speaker echo return and suppress noises into your microphone for easier

conversation experience. AEC is an innovative feature to make Xonar D2X the

best sound card choice for online chatting in VOIP applications (Skype, MSN,

Google, QQ, etc.) or online gaming. AEC provides the following benefits to you:

• Reduce the voice acoustic echoes like speakerphone devices when others talk

to you on line

• Minimize the playback sound echoes into your microphone during gaming or

music playback

• Effectively suppress background or system noises into your microphone

• 32-bit floating point algorithm providing precisely adaptive echo cancellation

performance up to 40dB

• Supports all VOIP applications and online games

To achieve the best performance of AEC function, the ideal system requirements

are as follows:

1. Speakers and microphone are low distortion (max. THD < 2%)

2. Flat frequency response between 300~4KHz

3. Use omni-direction electret microphone with >=40dB sensitivity

4. The microphone is more than 30cm far from PC’s speakers (fix the distance)

and do NOT turn your speakers too loud

5. Put your microphone 20~30cm away from you (fix the distance) and do NOT

speak too close or too loud into the microphone to avoid signal clipping and

distortion. Enable “microphone boost” on Xonar D2X audio center mixer to

get proper input signal level.

6. It’s suggested to disable original AEC function residing in some of the soft-

phones or voice communication programs to get best performance from

Xonar D2X audio card.

4 LFE Crossover

Frequency

Adjusts the cut-off frequency (50~250Hz) for LFE (low-

frequency effects) signals. Xonar D2X will filter out the bass

signals below the crossover frequency from small speaker

channels and forward them to the subwoofer. The higher

the crossover frequency, the more bass signals will be

subtracted.

AEC function will be only suitable for bi-direction voice communication

applications. The speaker type will be set as 2 speakers and special voice

processing mode while AEC is applied (all audio effects will be suspended and

those controls on audio center will be frozen.). After you finish the voice-over-

IP applications, please remember to turn it off for normal high-fidelity audio

playback mode.

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