LISTSERV mailing list manager LISTSERV 16.0

Help for ARSCLIST Archives


ARSCLIST Archives

ARSCLIST Archives


ARSCLIST@LISTSERV.LOC.GOV


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

ARSCLIST Home

ARSCLIST Home

ARSCLIST  June 2009

ARSCLIST June 2009

Subject:

Re: DC Art Tools for restoring old 78's/DeNoise/DeClick

From:

Clark Johnsen <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Fri, 19 Jun 2009 14:55:24 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (54 lines)

I sent this thread to my friend Tony Lauck, who has asked me to post the
following. (Tony is a highly experienced scientist and engineer in the
computer field, an audio recordist, and a classical music lover.)

On the Izotope RX Advanced:

I have been using RX Advanced for a few weeks and it has done a great job.
In particular, it is possible to get rid of lots of background noise
automatically without introducing "musical artifacts".  On the best setting
it is a little slow, in that it can take several times slower than real time
to do the noise reduction with a 2.9 GHZ PIV processor.  However, usually
you can take one 20 second section to explore the parameter space, so each
iteration only takes a minute or so.  Then when one has it right, turn RX
loose on an entire track and go for coffee if necessary.

I found in many cases that the RX noise reduction took care of hum,
generator noise, monitor whine, etc. all automatically.  In some really bad
cases, slight improvements were had by using the hum reduction module.

There are a variety of ways to patch individual defects and these are well
integrated with the spectrographic display. It is very easy to spot
individual defects like mike pops by a speaker or singer, audience coughs,
birds singing outside an open window, etc., not to mention digital ticks,
vinyl noise. One needs a lot of discipline and a strategy to determine which
"defects" are part of the performance and which are unwanted artifacts of
the recording.

On one voice recording there was a loud truck for 20 seconds that remained
after the general noise reduction.  A second pass with a noise print on the
truck removed almost all of the truck noise, but left a complete absence of
ambiance.  This was easily cured by mixing in room noise from another
section of the recording. The result was described as almost magical by my
friend who will be using this sound track in a video. Of course speech is
easier than music, because of the frequent pauses.

I have yet to do the due diligence as to high end sound quality when a file
is passed through RX.  I expect some degradation on portions of the file
that are being repaired or cleaned up.  But it would be nice to know that
other parts of a file are not subtly degraded just by being passed over by
the software.  So I am going to do some tests.  I expect some loss of sound
quality, consistent with introduction of dither noise, but since RX operates
at 32 bits floating point or 24 bits fixed point I expect that these tests
will find a minimal impact.

I am still learning about tradeoffs with various parameters, such as how to
set up equalizers, when to use minimum phase or linear phase, etc., but I
can't go too far on these issues until I get better monitoring capability
and improve the acoustics of my workspace.

The $1200 I spent on this software appeared to be excessive at the time, but
in retrospect I consider it a bargain.

Tony

Top of Message | Previous Page | Permalink

Advanced Options


Options

Log In

Log In

Get Password

Get Password


Search Archives

Search Archives


Subscribe or Unsubscribe

Subscribe or Unsubscribe


Archives

November 2020
October 2020
September 2020
August 2020
July 2020
June 2020
May 2020
April 2020
March 2020
February 2020
January 2020
December 2019
November 2019
October 2019
September 2019
August 2019
July 2019
June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
October 2004
September 2004
August 2004
July 2004
June 2004
May 2004
April 2004
March 2004
February 2004
January 2004
December 2003
November 2003
October 2003
September 2003
August 2003
July 2003
June 2003
May 2003
April 2003
March 2003
February 2003
January 2003

ATOM RSS1 RSS2



LISTSERV.LOC.GOV

CataList Email List Search Powered by the LISTSERV Email List Manager