From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: AndreaElectronics PureAudio USB-SA Date: Fri, 25 Jun 2010 10:25:00 +0200 Message-ID: <4C2467DC.9020302@ladisch.de> References: <4C23E611.9040309@l2f.inesc-id.pt> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from out1.smtp.messagingengine.com (out1.smtp.messagingengine.com [66.111.4.25]) by alsa0.perex.cz (Postfix) with ESMTP id E630D1039A7 for ; Fri, 25 Jun 2010 10:25:01 +0200 (CEST) In-Reply-To: <4C23E611.9040309@l2f.inesc-id.pt> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: rmfc Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org 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. Regards, Clemens