Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
22nd November 2020, 17:03 | #21 | Link | |
Registered User
Join Date: Mar 2009
Location: Germany
Posts: 5,769
|
Quote:
If both (US+UK) albums have been played and digitised using the same hardware, then it can only be the master and a faulty filter/renderer (in the duplication chain), or, an overmodulated vinyl (but this would usually cause many harmonics which are missing). A lot of "analogue" vinyls originate nowadays from digital masters.
__________________
Born in the USB (not USA) |
|
25th November 2020, 16:40 | #22 | Link | |
Registered User
Join Date: Apr 2004
Location: London, England
Posts: 168
|
Quote:
I can get the details of the chain used, but it's not the chain otherwise the UK version would look the same so the cutting head theory looks to me like the best solution so far. It's absolutely looking like a modulated signal.....
__________________
www.opusproductions.com Multichannel Audio Productions DVD-Audio/Video Authoring specialists |
|
25th November 2020, 16:42 | #23 | Link | |
Registered User
Join Date: Apr 2004
Location: London, England
Posts: 168
|
Quote:
Sample rate & bit depth is 24-bit 96kHz....
__________________
www.opusproductions.com Multichannel Audio Productions DVD-Audio/Video Authoring specialists |
|
25th November 2020, 16:43 | #24 | Link |
Registered User
Join Date: Apr 2004
Location: London, England
Posts: 168
|
BTW:
Thanks to everyone who has chipped in here - it really is appreciated.
__________________
www.opusproductions.com Multichannel Audio Productions DVD-Audio/Video Authoring specialists |
27th November 2020, 18:28 | #25 | Link |
Registered User
Join Date: Mar 2009
Location: Germany
Posts: 5,769
|
It was a time when the companies amused themselves with all kind of copy-protection (prevention) methods. One of these used such signals amongst which 22kHz was a favourite. Such a parasitic signal would affect the Dolby system (like the pilot tone of FM Stereo).
__________________
Born in the USB (not USA) |
3rd December 2020, 13:39 | #26 | Link | |
Angel of Night
Join Date: Nov 2004
Location: Tangled in the silks
Posts: 9,559
|
Quote:
|
|
13th December 2020, 14:11 | #27 | Link |
Registered User
Join Date: Apr 2004
Location: London, England
Posts: 168
|
It seems that we have found the cause of this odd signal - it turns out to be a Black Light lamp near to the setup!
Turn this off & the signal goes away, turn it back on & it returns. So the above from foxyshadis seems to be on the mark - EMF during capture, probably caused by cheap, nasty screening of the PSU on the Blacklight or the bulb itself (probably not the bulb as the wavelength of the UV is 365nm, and that is far, far too high a frequency when converted so to my mind this must leave the PSU (AC is 100-120 @ 50/60Hz with a 13watt output). So mystery solved - and many thanks for all your input in this thread.
__________________
www.opusproductions.com Multichannel Audio Productions DVD-Audio/Video Authoring specialists |
13th December 2020, 15:33 | #28 | Link |
Life's clearer in 4K UHD
Join Date: Jun 2003
Location: Notts, UK
Posts: 12,227
|
__________________
| I've been testing hardware media playback devices and software A/V encoders and decoders since 2001 | My Network Layout & A/V Gear |
|
15th December 2020, 22:48 | #29 | Link |
Big Bit Savings Now !
Join Date: Feb 2007
Location: close to the wall
Posts: 1,545
|
Ah, so it wasn't cut into the groove.
And I had assumed perfect capture conditions, not a SMPS close by. 22kHz fits the bill, and the US mains ripple modulation pattern too. Just today a Neve preamp copy (NV73) came in for repair and what do I see: A bloody SMPS to get +24V out of +-16V, sitting close to the precious µV-sensitive Microphone preamp, input transformer, physically touching the output pot. Photo anyone ?
__________________
"To bypass shortcuts and find suffering...is called QUALity" (Die toten Augen von Friedrichshain) "Data reduction ? Yep, Sir. We're that issue working on. Synce invntoin uf lingöage..." Last edited by Emulgator; 15th December 2020 at 22:50. |
Thread Tools | Search this Thread |
Display Modes | |
|
|