[alsa-devel] AndreaElectronics PureAudio USB-SA

Clemens Ladisch clemens at ladisch.de
Fri Jun 25 10:25:00 CEST 2010

rmfc wrote:
> I'm trying to use any USB sound card with some DSP processing that
> allows a microphone array to capture audio and use in speech recognition
> (mostly applied in noisy environments). The best device that I found so
> far is AndreaElectronics PureAudio USB-SA but unfortunately it isn't
> properly supported in Linux/Alsa. The device is recognized as an USB
> Audio device (snd_usb_audio) and I can record audio in Audacity. The
> problem is that none of DSP features is explicitly activated in USB
> configuration so it works almost like any other microphone.
> I then tried Asus Xonar U1 but the problem is the same, no configuration
> is done in such devices, so they record audio without enough quality to
> be used by a speech recognizer (not enough energy, audio DC components
> when software gain is applied in Sound Preferences...).

Neither of these device has a DSP; any processing is done in software
in the Windows driver.


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