[AG-TECH] Tabletop-Room mic with integrated echo canceling

Michael Braitmaier braitmaier at hlrs.de
Thu Jun 21 01:40:53 CDT 2007

To clatify:

I bought the DSP board from Phoenix Audio and not the PCI-Card.
I assembled it in a case which I bought at a online-shop which offers stuff
for electronic devices, and small electrinic parts (e.g. transistors, 
resistors, etc.)

So far it worked quit well, however it needs a second to adapt to 
changed audio levels, for example if you drastically change
distance between the mic and the speakers or change the volume of the 

As I still got some e-mails refering to teh ClearOne AccuMic PC, I want 
to mention again:
This microphone is no longer being produced by ClearOne according to our 
German reseller for ClearOne products.


Michael Braitmaier schrieb:
> Hi everyone!
> I just wanted to let you all know, what I finally came up with.
> As availability of the ClearOne AccuMic PC is very rare and is not 
> produced anymore (according to my national reseller)
> I decided for a solution which is in the beginning a bit more work. I 
> ended up buying the following DSP-EchoCanceler-Board
> http://www.phnxaudio.com/Default.aspx?tabid=75
> Basically it does the same as their PCI-Card which however only fits 
> in Desktop-PCs. (see link for information: 
> http://www.accessgrid.org/node/116)
> In addition to the board I bought some stuff to put everything in a 
> small case and have 3.5mm (like they are common among PCs) connectors 
> in that case.
> The result is a small echo canceler device that is portable can be 
> used with PCs and Laptops and in conjunction with small audio mixers
> like from Behringer it can echo cancel a tabletop and a wireless mic. 
> The whole cost only was about 180Euro for the complete box.
> Fields of application for us will be, to quickly equip rooms with 
> AccessGrid in conjunction with a table top microphone for conferences 
> up to a max. of ~10 people.
> Furthermore usage on exhibitions in conjunctions with wireless mics, 
> AccessGrid and our collaborative software is intended.
> I consider that cheap and more flexible even compared to the ClearOne 
> AccuMic PC which in Germany was around 650 Euro.
> So that's my 2 cent.
> I might post an entry in AccessGrid.org's hardware section, however I 
> am not sure whether that would be of use as you can't buy that box
> but only the parts to assemble it.
> Michael
> Michael Braitmaier schrieb:
>> Hello everyone!
>> I am a bit in trouble as I need to order a tabletop mic with 
>> integrated echo cancelation quite fast, however don't have experience 
>> with them. So I would like to rely on your experiences.
>> So can anyone recommend one or two of such mics, which work fine and 
>> produce good results, for direct connection into a 3.5mm PC-Audio-in?
>> I have just had a look at the follwoing Clearone Mic ( 
>> http://www.clearone.com/products/product.php?cat=4&prod=17 ),
>> which seems to be able to work on PCs directly. Does anyone of you 
>> already have experience with this one?
>> Thanks in advance
>> Michael

Dipl.-Inf. Michael Braitmaier
HLRS - Visualization / Video Conferencing
University of Stuttgart
Phone: ++49 711 685 65996
Fax  : ++49 711 682 357
Website: http://www.hlrs.de/people/braitmaier/

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