From mboxrd@z Thu Jan 1 00:00:00 1970 From: Raymond Yau Subject: Re: Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII Date: Thu, 18 Feb 2010 10:11:03 +0800 Message-ID: <4f3252891002171811q7fbfaady417165e1da497e4e@mail.gmail.com> References: <20100215192451.GA17938@tango.0pointer.de> <20100216143200.GB25489@tango.0pointer.de> <20100216144047.GB10586@sirena.org.uk> <20100216154015.GA612@tango.0pointer.de> <20100216210703.GA18109@tango.0pointer.de> <20100216223938.GA23623@sirena.org.uk> <20100216224212.GA1486@tango.0pointer.de> <4B7B2E9F.3080809@audioscience.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pw0-f51.google.com (mail-pw0-f51.google.com [209.85.160.51]) by alsa0.perex.cz (Postfix) with ESMTP id 337B310387F for ; Thu, 18 Feb 2010 03:11:06 +0100 (CET) Received: by pwi9 with SMTP id 9so1109658pwi.38 for ; Wed, 17 Feb 2010 18:11:05 -0800 (PST) In-Reply-To: <4B7B2E9F.3080809@audioscience.com> 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: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org 2010/2/17 Eliot Blennerhassett > 2) Absolute calibration of output levels. > (This is *not* required to solve Lennart's problem) > This would be required if you wanted two different (brands of) soundcard > to output the same voltage for given source pcm. > > On windows ,there are benchmark program to compare the sound card 's SNR at different rate , format http://audio.rightmark.org/ can the program be used to measure SNR ?