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Thread: Usb soundcard with acoustic echo cancellation

  1. #1
    Maximum Bitrate boelle's Avatar
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    Usb soundcard with acoustic echo cancellation

    Hi, I have tried to find a usb soundcard that has acoustic echo cancellation but has hit the wall so far, only other demand i have is that is has to be a 5.1 card.

    My terratec aureon 5.1 does not have it (as far I know) and its a pain to to be on the phone and people in the other end have echo (they hear themselfes twice). I don't have the echo so I could go the screw the caller route but I'm a nice person.

    Do anybody know a card that meets my demands? before i forget, independt level for each channel could also be nice.

    A software route would be an alternative
    Blessed are the "cracked" for it is they who let in the light.

  2. #2
    Maximum Bitrate boelle's Avatar
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    Blessed are the "cracked" for it is they who let in the light.

  3. #3
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    Phoenix Audio Technologies (www.phnxaudio.com) has a MT107A Hands Free Echo Canceling System for Auto PC.
    It is powered by USB, has microphone in, speaker in,Analog audio out and speaker out using stereo 3.5 mm cables.

    The manual states "you can use the USB connection instead if a digital connection is utilized", also "Note: you can select to split the speaker signal, by connecting our unit with one end of the split and your speakers
    directly with the other"

    I assume that this means you can use your own 5.1 sound card for speaker out, split off the left and right front or rear speakers and ground to the speaker in, run the other split to your speakers (or amplifier?). Set your microphone in to the digital USB in
    or the analog audio out to sound card microphone in.

    Pureaudio USB-SA only has microphone in and headset out, I don't believe you can use your own 5.1 sound card.

    You can view the manual at -
    http://www.phnxaudio.com/components/...r%20Manual.pdf

    You can purchase for $149.99 at -
    http://www.mo-co-so.com/Phoenix-Audi...-pat-107-a.htm.


  4. #4
    Constant Bitrate
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    Hmmm. In theory I always thought you could take the speaker output, invert it and add it to the microphone input. You would want to have an adjustable delay to compensate for the speaker distance.

    This website has info on making a pair of headphones for noise cancelling. This information could be applicable to this project as well.

  5. #5
    Maximum Bitrate boelle's Avatar
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    Quote Originally Posted by TheMadTinker View Post
    ......has a MT107A Hands Free Echo Canceling System for Auto PC....
    Yep, but would do the same as the unit I found, its an pci, but the nice thing is that the pci slot is only used to supply 5V. So I can just run it off a usb port instead, Also the unit i found are sold at a shop local to me. That is not the case with the mt107a and both units work the same way, ie. loop mic and a pair of speakers through it.

    Also the price speaks in favour of the pci card, its about 28 $ cheaper for me, and then i have not even calculated that i have to pay import duty and sales tax witch would add another 35% to the mt107a if i should get it from the us.

    Quote Originally Posted by TheMadTinker View Post
    Pureaudio USB-SA only has microphone in and headset out, I don't believe you can use your own 5.1 sound card.
    Nope, for acoustic echo cancellation to work speakers and mic has to be on the same soundcard, i have the SA as it came with my mic. Tried the setup and its a no-no.
    Last edited by boelle; 06-22-2011 at 03:40 AM.
    Blessed are the "cracked" for it is they who let in the light.

  6. #6
    Maximum Bitrate boelle's Avatar
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    Quote Originally Posted by Ryven View Post
    Hmmm. In theory I always thought you could take the speaker output, invert it and add it to the microphone input. You would want to have an adjustable delay to compensate for the speaker distance.
    In theory yes. One can wonder why there are so few usb cards with echo cancel, remember that noise cancel and echo cancel are like us football and the european kind, the name is almost the same, but the way it works are huge different :-D
    Blessed are the "cracked" for it is they who let in the light.

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