From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eric Wong Newsgroups: gmane.comp.audio.sox.devel Subject: Re: noisered vs Audacity's noise removal filter Date: Tue, 30 Dec 2014 11:42:49 +0000 Message-ID: <20141230114249.GA25547@dcvr.yhbt.net> References: <508AE2A4.3000808@iname.com> <20121027181713.GA13149@dcvr.yhbt.net> Reply-To: sox-devel@lists.sourceforge.net NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1419939793 5874 80.91.229.3 (30 Dec 2014 11:43:13 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 30 Dec 2014 11:43:13 +0000 (UTC) To: sox-devel@lists.sourceforge.net Original-X-From: sox-devel-bounces@lists.sourceforge.net Tue Dec 30 12:43:06 2014 Return-path: Envelope-to: gcasd-sox-devel@m.gmane.org X-ACL-Warn: Content-Disposition: inline In-Reply-To: <20121027181713.GA13149@dcvr.yhbt.net> X-Spam-Score: -0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Headers-End: 1Y5vCQ-0004gj-UU X-BeenThere: sox-devel@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: sox-devel-bounces@lists.sourceforge.net Xref: news.gmane.org gmane.comp.audio.sox.devel:391 Archived-At: Received: from lists.sourceforge.net ([216.34.181.88]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Y5vCa-00040T-MS for gcasd-sox-devel@m.gmane.org; Tue, 30 Dec 2014 12:43:04 +0100 Received: from localhost ([127.0.0.1] helo=sfs-ml-4.v29.ch3.sourceforge.com) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Y5vCT-0003Cg-MC; Tue, 30 Dec 2014 11:42:57 +0000 Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Y5vCS-0003CZ-6w for sox-devel@lists.sourceforge.net; Tue, 30 Dec 2014 11:42:56 +0000 Received: from dcvr.yhbt.net ([64.71.152.64]) by sog-mx-1.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1Y5vCQ-0004gj-UU for sox-devel@lists.sourceforge.net; Tue, 30 Dec 2014 11:42:56 +0000 Received: from localhost (dcvr.yhbt.net [127.0.0.1]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPSA id 78F911FA6C; Tue, 30 Dec 2014 11:42:49 +0000 (UTC) Eric Wong wrote: > Daniel Jensen wrote: > > Obviously since Audacity's filter is GPL'd while SoX's effects are > > LGPL'd, code can't be shared. (Even if SoX decided that this could go > > under the GPL, since Audacity's filter is in WxWidgets-heavy C++ this > > wouldn't help much.) I know very little about how clean-room one has to > > be in reimplementing their ideas to avoid the result becoming a > > derivative work. > > I suggest writing a standalone LADSPA or lv2 plugin. This way the > filter can be useful to different programs. Did you ever get around to doing this as a plugin? :) Two years passed, I barely touched audio editing in that time, but today I used noisered for the first time. I have a recording made with excessively low levels (around -30dB Pk, -57dB RMS); yikes. So far, I've only found some quiet 100ms sections to make a noise profile with (due to people moving/talking around me). At first, the result was littered with nasty artifacts with the default noisered "amount" parameter (0.5). However, I found the results are pretty good with an "amount" value set to zero. Using a >0 amount seems to introduce unpleasant artifacts. I'll try to get a cleaner "silent" sample to noise profile with (recording a new silent track may be necessary). Most of the noise I'm trying to reduce is from my recording gear and mics. The blessing in that is it ought to be easy to make a good profile track once I get myself into a quiet room. Hopefully I can avoid doing any more coding if I find a better sample to noiseprof with, since the artifacts in my current work-in-progress track are barely noticeable. But if push comes to shove, I'll see if I can improve the sox effect or port the Audacity one to LADSPA... > I've also made patches which improve LADSPA support in SoX: > https://sourceforge.net/tracker/?func=detail&atid=310706&aid=3534109&group_id=10706 Applied in 14.4.2rc1 \o/ ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net