LISTSERV mailing list manager LISTSERV 16.0

Help for ARSCLIST Archives


ARSCLIST Archives

ARSCLIST Archives


[email protected]


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  May 2017

ARSCLIST May 2017

Subject:

Re: Digital capture of 12-bit/32kHz DAT via S/PDIF (not DDS drives)

From:

Eli Bildirici <[log in to unmask]>

Reply-To:

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

Date:

Wed, 3 May 2017 05:03:17 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (48 lines)

Hey Corey,
Yes, I'm aware that clock sync is important and suspected it was somehow at the root of my problems. (I thought I said as much in my OP?) I was hoping to get specific recommendations re capture equipment that's economical and reliable - I'm sorry if this was not clear. (It appears our M-Audio FW Solo, despite having an external sync option in its control panel - which, if not toggled, yields silence when trying to record - it still never properly locked on for whatever reason; in any case that it doesn't support 32kHz inputs limits its usefulness in this case).
It would be pretty cool to have an entire capture chain with word-clock inputs and a separate master clock device - and I should have surmised that many of you here are fortunate enough to have access to such equipment - but as far as I can tell this would unfortch not be cheap and would in fact be far more expensive than the SCSI DDS solution. Our gameplan now is to borrow one of these but I hope to try recording via the SPDIF input of a CM6206-based device as well (for my own edification/to be used in a pinch) and report back, especially now that people here (thanks guys!) have explained that the non-linear 12/32 data is most likely mapped to 16/32 before leaving the deck. I spoke to someone today who actually called me a few minutes after I had posted and mentioned (among many other things) having had success with a C-Media-based card before - likely one with a much older chipset but still heartening all the same. I'm not married to this particular chipset though: I just don't know what other capture equipment is out there that accepts external sync, and supports 16/32 input (to say nothing of not costing an arm and a leg). It was hard enough to find the datasheet on the CM6206 (it has a 32khz input mode, though I'm not sure about external sync: I think I linked to the datasheet in an earlier post) and was only lead there after finding that that's what these eBay boxes use (kind of a backwards way to go about it but I guess it is what it is).
In any case thanks for at least confirming (I think?) that I'm barking up the right tree. Any other comments would be most welcome.
E

May 2 2017 10:47 PM, "Corey Bailey"  wrote:
 The bottom line:
You need a capture card (or A/D, D/A converter) that has the ability to sync its internal clock to
the SPDIF stream of the source. Same goes for an AES source. The alternative, which Ellis no doubt
used, is to sync the player, the converter and your ingest computer to an external clock (House
sync or clock) running at the sample rate of the source. Otherwise, you will get clock errors
because everyone is not marching to the same drummer (or: clock source). The end result is dropped
frames by your capture device which manifests itself as random ticks or pops.

Hope this helps,

Corey
Corey Bailey Audio Engineering
www.baileyzone.net

On 5/2/2017 2:49 PM, Eli Bildirici wrote:
 OK great, there is hope! I will try to play back via a CM6206 capture card (spec sheet
(http://www.bramcam.nl/NA/8663-XS/CM6206.pdf (http://www.bramcam.nl/NA/8663-XS/CM6206.pdf)) indicates 32kHz input support - see page 15) or our
PowerMac
G5 and hopefully report back. Thanks a lot for this insight!

Eli

May 2 2017 5:39 PM, "John Chester" wrote:
On 5/2/17 5:15 PM, Eli Bildirici wrote:
'Sending encoded 12 bit values to a linear DAC will surely give horribly distorted audio.'
Aha. If that is the case, then can we presume that when output via S/PDIF, a 12/32 DAT has already
had its bits mapped to 16-bit linear values? That would be good news for my purposes, I think...

In order to produce analog output from a 12 bit recording, presumably the DAT machine converts to
16 bit linear, which it then sends to its internal 16 bit DAC. Thus, the sensible choice would be
to send the converted 16 bit values to the S/PDIF output -- but I have no idea if that's what
actually happens. If you listen to the 32 kHz S/PDIF output, and you hear undistorted audio that
sounds similar to the DAT machine's analog output, then I think you can assume that is what's
happening.

-- John Chester
Eli Bildirici
(347) 837-8337  
Eli Bildirici
(347) 837-8337

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

March 2024
February 2024
January 2024
December 2023
November 2023
October 2023
September 2023
August 2023
July 2023
June 2023
May 2023
April 2023
March 2023
February 2023
January 2023
December 2022
November 2022
October 2022
September 2022
August 2022
July 2022
June 2022
May 2022
April 2022
March 2022
February 2022
January 2022
December 2021
November 2021
October 2021
September 2021
August 2021
July 2021
June 2021
May 2021
April 2021
March 2021
February 2021
January 2021
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