quote: Harold Hallikainen

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You can make an AES splitter with six resistors per pair.

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I needed to do something similar a couple of years ago. I used
this circuit, which I found on the internet, and apparently uses
one less resistor than Harold's, but it worked fine for me:


This situation was a bit different than what Harold was doing,
since I needed to go from AES to SPDIF, but if you poke around
on the 'net, you might find a circuit that works for you.
 

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Posted by Carsten Kurz (Member # 5396) on 04-24-2017, 05:28 AM:
 
I guess a cheap S/P-DIF Audio ADC is the better way to go for the typical cinema processor with analog only HI output.

e.g. http://www.ebay.com/itm/Analog-RCA-Stereo-To-Optical-Audio-Coax-S-PDIF-Digital-Audio-Forma t-Converter-/191566028140?hash=item2c9a399d6c:g:SwgAAOxyhodRvN-F

Don't mistake it for one of those many even cheaper S/P-DIF digital to analog audio converters available on ebay or Amazon.

- Carsten
 

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Posted by Steve Guttag (Member # 268) on 04-24-2017, 08:24 AM:
 
It is definitely a flaw in the Fidelio system. If you want HI on trailers, Blu-rays or any DCP that doesn't have a dedicated HI track, then you have to D-A the ADA signal and then A-D it back with the derived HI combined with the supplied VI-N track. This makes the Fidelio system yet more expensive (and a hassle to install). Up until recent firmware updates, if you over drove the signal in a Fidelio transmitter, it would reset itself (repeatedly too) so you had to really mind your levels.
 

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Posted by Chris Daigle (Member # 7347) on 12-29-2017, 01:10 PM:
 
After installing the new USL/QSC Hearing Impaired/Closed Caption system we're having an issues with getting the HI track to output during the trailers. On two of our screens we have USL JSD-60 sound processors and those are working fine. On the others, I have Dolby CP650's connected to a USL DAX-602 and the HI signal doesn't kick in until the feature starts. Is there something I have to do to get the HI signal from the trailers to output from the DAX?
 

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Posted by Dave Macaulay (Member # 813) on 12-29-2017, 01:40 PM:
 
If the HI track is a mixdown from the analog audio, it will be present for all content. If it's using the HI/VI AES digital channel then only content with HI/VI tracks will be heard... and trailers usually do not have them. It is normal for captioning and HI/VI systems that use the data from a DCP to only work during features and very occasionally on trailers that include the data. I don't know if there's any push to require this for all cinema content.
 

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Posted by Harold Hallikainen (Member # 5405) on 12-29-2017, 04:34 PM:
 
As I recall, the CP650 has an analog HI output that is the sum of left, center, and right. You can use this to drive the IRC-28C instead of using the HI output of the HI output of the DAX-602, which is AES/EBU channel 7 and will only have audio if there is HI audio in the DCP.

Harold
 

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Posted by Sean McKinnon (Member # 612) on 12-30-2017, 07:00 PM:
 
I would use the HI output from the co-650 to drive the HI emitter so that you get the alt content and trailers. Also I like to use a mixer to mix the HI into the VI so or send the HI to one ear and VI to the other so the customer can set their own mix.
 

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Posted by Stephan Shelley (Member # 8587) on 12-30-2017, 07:04 PM:
 
The new USL head sets allow mixing of the HI & VI. The fedelo system allows the receivers to be programed to receive both HI and VI and mix it.
 

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Posted by Harold Hallikainen (Member # 5405) on 12-30-2017, 11:26 PM:
 
The QSC/USL model that allows the user to mix HI an VI is the IRH-281.

Harold
 

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Posted by Sean McKinnon (Member # 612) on 01-01-2018, 02:43 PM:
 
A lot of the systems we do are heavy in alternate content. It would be nice if the fidelio had an analog input that you could mix with the HI and VI as needed b
 

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Posted by Carsten Kurz (Member # 5396) on 01-02-2018, 06:09 AM:
 
Yes - a great flaw with the Fidelio system. Some locations use an external small A/D converter to feed the processor HI output into the Fidelio transmitter.

- Carsten
 

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Posted by Chris Daigle (Member # 7347) on 01-02-2018, 02:51 PM:
 
So we're currently playing "All the Money in the World", which as part of the CPL includes "...CCAP_OV_51_HI-VI_2K_SPE...." but it doesn't give us any Narrative, HI or Caption output through our USL UPC-28C. I thought it might be a problem with the setup of the USL system as we just finished installing it, but when we play another feature in that auditorium, everything works fine. For those running CC systems, is it common to have CPL's indicate that there are captions and narrative but they don't work? We're running this through a GDC server and Dolby CP650/DAX combo.
 

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Posted by Harold Hallikainen (Member # 5405) on 01-02-2018, 03:03 PM:
 
Does other show content (like trailers) have HI? The UPC-28C brings up the carriers on presence of audio and keeps the carriers up for about 30 minutes after the last sense. It's possible that the audio level is not high enough for the UPC-28C to sense it. But, if the trailers work, the feature should work. There are LEDs on the bottom of the UPC-28C that show which carriers are up. See http://ftp.uslinc.com/ftp/Products/IRC-28/Documents/Technical/IRC_Indicators.jpg . If carriers are up and you don't hear any audio on this feature, and you did on the trailers or and other features, it MAY be due to audio routing in the server. Studios are switching from Interop to SMPTE packages, and a common issue is misrouting of audio.

Harold
 

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Posted by Richard May (Member # 2627) on 01-02-2018, 04:16 PM:
 
We had this same problem a few weeks ago with the same USL system but different movie. The CPL title said CCAP but there was no captioning from it. We looked at the details of the CPL on the server and it said there was no closed captioning present.
 

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Posted by Harold Hallikainen (Member # 5405) on 01-02-2018, 04:31 PM:
 
OK, THAT's interesting! The naming convention said CCAP, but none were listed in the CPL? Fun!

In general, if anyone has issues with the USL IRC/UPC-28C, let me know. The unit has extensive logging that helps us debug issues.

Thanks!

Harold
 

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Posted by Carsten Kurz (Member # 5396) on 01-02-2018, 07:37 PM:
 
At least for Interop DCPs (as opposed to SMPTE DCPs), it would be easy to look at the DCP directory and find the caption data in folders, and they should be referenced in readable form in the CPL XML file. Maybe not all cinemas have means to access their DCPs from an ordinary computer, but it's no big deal to enable yourself to access these files.

- Carsten
 

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Posted by Chris Daigle (Member # 7347) on 01-03-2018, 08:29 AM:
 
On the GDC we found that changing the Audio Mapping Interop setting for "8 channels" from 5.1 plus HI/VI-N to "DEFAULT" fixed the problem. Once we did that, we were getting signal output to the UPC-28C that we weren't getting before we changed it.
 

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Posted by Steve Guttag (Member # 268) on 01-03-2018, 01:23 PM:
 
I have definitely found that on the Doremi stuff that using the channel mapping can burn you on the SMPTE packages. We have gon through and rewired quite a few systems to let the servers play a straight up mapping and have the wires done to get 7.1 to work and let HI/VI play on 7/8.
 

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