Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v69HnTYc003996 for ; Sun, 9 Jul 2017 19:49:30 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dUGGr-0007yF-Oh for rs_out_1@blacksheep.org; Sun, 09 Jul 2017 18:45:25 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dUGGr-0007y6-3u for rsgb_lf_group@blacksheep.org; Sun, 09 Jul 2017 18:45:25 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dUGGo-0001DL-5N for rsgb_lf_group@blacksheep.org; Sun, 09 Jul 2017 18:45:23 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 981C720914 for ; Sun, 9 Jul 2017 19:45:18 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3x5G2k06Fxz10HX for ; Sun, 9 Jul 2017 19:45:17 +0200 (CEST) Message-ID: <59626BAC.4060200@posteo.de> Date: Sun, 09 Jul 2017 19:45:16 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <15d26b31fb5-c01-17d82@webjas-vab174.srv.aolmail.net> <59621195.4080109@posteo.de> <4eea559e-7e23-f390-67db-c43f68d103db@abelian.org> In-Reply-To: <4eea559e-7e23-f390-67db-c43f68d103db@abelian.org> X-Scan-Signature: 5c335215f1b3de26d890ee84d49616ce Subject: Re: LF: Octo-soundcard for the Raspi, another question Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 12207 Here it is: www.iup.uni-heidelberg.de/schaefer_vlf/VLF/test.vt 73, Stefan Am 09.07.2017 19:33, schrieb Paul Nicholson: > > Let's try an experiment. > > Capture a short sample 6 channels 96k/sec int2 format, > directly into a file. > > No input, all inputs open circuit. Max alsamixer gain. > > Hopefully capture where at least one channel is showing > a long 'event', eg 100mS where the noise drops. > > Maybe it doesn't appear when there is no input tone. > > If it does, we can measure the noise during the event > and compare with my Octo. We can work out whether or not > the noise level during the event is the 'correct' one. > > vtcard -d hw:0,0 -b32 -c8 -r96000 -u -v test.vt,i2 > > -u turns off timestamping. Just ctrl-C to stop it > after 20 seconds or so then look at it with vtsgram > to see if any of the channels has a good noise event. > > -- > Paul Nicholson > -- >