How to avoid or Reduce echo effects

[thomas k]

Hi,

I know its recommended to use headphones to reduce echo effects. But we have the case of conferences where on one side maybe participate 5 -8 people. They cannot all be connectd by headphones.
We tested it using bbb 0.9.0-beta on ubuntu 14.04 with external microphone and external speakers and the echo effects were strong. How such a conference can be managed best regarding echos?

thanks in advance for help

[Fred Dixon]

Hi Thomas,

You not going to have any success with open speakers/microphones for computers next to each other.  The acoustic echo cancellation can only work on a single computer in a relatively quiet room.

If there are two (or more) active mics and/or two (or more) active speakers next to each other, you'll get (epic) feedback.

Regards,... Fred

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[Frédéric Meynadier]

Hi,

Le jeudi 10 septembre 2015 21:21:29 UTC+2, thomas k a écrit :

We tested it using bbb 0.9.0-beta on ubuntu 14.04 with external microphone and external speakers and the echo effects were strong. How such a conference can be managed best regarding echos?

I also had to deal with this kind of problem...
You could use specific hardware, with built-in echo cancellation, on a single computer shared by those few participants (at least for the audio part : each could also be connected, without microphone and muted speakers, to share screen...). E.g. :

http://en-us.sennheiser.com/sp-20-og-sp-20-ml
http://www.polycom.com/products-services/voice/desktop-solutions/pc-speakerphones.html

The polycom model I use (communicator C100S) seems to be a bit extreme with respect to echo cancellation : I have the feeling it simply closes the microphone when it detects incoming audio, which makes it difficult to interrupt chatty participants... But still, it is very useful in this kind of situation.

Out of curiosity, does anybody have a better device to propose ?

Regards,

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 Frédéric

[Bronwyn Lapham]

We've used a Phoenix USB combination mic/speaker quite successfully with a small group like that around a conference table.

[Fred Dixon]

Hi Bronwyn,

I personally recommend checking out the Blue Yeti USB microphone

   http://www.bluemic.com/yeti/

They are professional USB microphones that can be adjusted to pickup audio in the entire room.  I've used it to record audio in a large classroom at the recent Moodle Conference in Canada.  I found it very good for calls around a conference table as well.

Regards,... Fred

 

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[Bronwyn Lapham]

Thanks for that. I'll keep it in mind.

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