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  March 2010

ARSCLIST March 2010

Subject:

Re: Disc EQ in the digital domain

From:

Steven Smolian <[log in to unmask]>

Reply-To:

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

Date:

Thu, 11 Mar 2010 07:31:04 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (115 lines)

Actually, a properly used Packburn bypassed the RIAA curve and processed 
flat, after which eq was added.  Packburn offered another control amp with 
the two segments of eq on rotary switches.  I have one in my "maybe it still 
works" equipment archive.  Eventually, they offered one on a late model 
Packburn, though I never liked that aspect of it.

I still have a Mac 26 preamp with a switch installed on the top to allow me 
to bypass the RIAA.

Many complaints about the PB were a result of not giving it sufficient high 
frequencies to work with.  Dick Burns was furious that people blamed his 
machine for less than optimum results when they ignored this aspect of how 
the machine was designed to operate and then blamed it for por results.

It also suffered from folks turing the controls so far up that the sound was 
affected, never mind those who didn't balance the left and right channels. 
Ears were a useful attribute to using the Packburn successfully.

And then there were those who employed it on stereo sources.....

Steve Smolian

----- Original Message ----- 
From: "Parker Dinkins" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, March 10, 2010 10:25 PM
Subject: Re: [ARSCLIST] Disc EQ in the digital domain


> on 3/10/10 6:38 PM US/Central, George Brock-Nannestad wrote in part:
>
>> For this reason it would appear that going flat to your A-D, going into 
>> noise
>> reduction (not here discussing the various characters of noises) and then
>> perform the EQ digitally, while you are at it, would give the best 
>> effect.
>> However, as more and more noise reduction is using physiological 
>> properties of
>> the ear for noise masking, possibly this approach will be thwarted, as 
>> the ear
>> does not like to listen to a non-boosted bass from a pre-vinyl record, 
>> and so
>> the wrong masking procedure would be applied if you had not already 
>> corrected
>> the response in the pre-amp. It is probably a compromise situation.
>
> George, hi.
>
> In the early days of digital audio, click removal from disks was thwarted 
> by
> well meaning people who used the Packburn, low pass filters, or even 
> manual
> oxide removal.
>
> Automatic digital click removal consists of detection and then repair. 
> Since
> a click is usually just a burst of white noise, any muffling of that burst
> made automatic detection and repair more difficult, and sometimes even
> impossible.
>
> Click detection was so important that, in some cases, you would get good
> results by creating a duplicate file using a high pass filter, and using
> that file to flag the areas to be declicked. The high pass file would be
> removed and the original file put back in its place so actual repairs 
> could
> be made.
>
> As a logical progression, click removal before imposing the RIAA playback
> curve significantly improved in the click detection process because the 
> RIAA
> playback curve reduces high frequencies.
>
> With modern tools, transferring flat, removing clicks, and then imposing 
> the
> RIAA playback curve is not as essential to the click removal process as it
> once was - but it's certainly the conservative and correct approach for
> archival work because we don't know what further developments will occur
> with digital technology. And it doesn't hurt in the click removal process.
>
> Digressing: I'm not sure I would describe the click removal process in 
> terms
> of masking, because masking has a particularly strong and different
> connotation with lossy audio compression. In click repair the actual work 
> is
> done by interpolation, in which the damaged audio is actually replaced 
> with
> new audio using algorithms based on what came before and after the click
> damage. If the click duration is short enough, almost anything can be used
> to replace it. The problem occurs when the damage is a longer duration, 
> and
> especially when the damage occurs with an instrument we are familiar with,
> like a piano. In a longer problem area, you can sometimes build across by
> interpolating from one side and then the other until they join each other.
>
> Back to the main point: the conclusion of R.S. Robinson in my previously
> cited 2007 AES Paper 7185 was that in most cases the bass resolution
> truncation was 1 bit or less, which is negligible in light of the 24 bit
> resolution capability of modern converters, and in all events is more than
> compensated for by enhancement in the higher registers, where aural acuity
> is greatest (like those Fletcher and Munson boys described).
>
> Ironically, linear phase digital eq can cause problems because its
> implementation requires combining bands after changing each band's
> individual delays in an attempt to create a linear phase eq (which cannot 
> be
> perfectly achieved). Ironically, this can be first audible in the lower
> registers. For that reason, some people prefer regular, precision digital
> eq.
>
> There's probably lots of poorly implemented digital eq in the world, too.
>
> -- 
> Parker Dinkins
> 

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

December 2020
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