This is topic Does it exists a DolbyTrue HD/DTS Master AUdio to Dolby Digital (AC3) converter ?? in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.


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Posted by Anhtu Vu (Member # 7689) on 06-30-2013, 11:17 PM:
 
I would like to plug an Oppo 103 BLuRay coax output to a Dolby DMA8+ coax input. Of course the DMA8+ won't do anything other than Dolby Digital (AC3)....Does it exist a DolbyTrue HD and DTS Master audio to AC3 converter ?? thx
 
Posted by Bajsic Bojan (Member # 4928) on 07-01-2013, 01:38 AM:
 
I don't think a hardware device exists for your purpose. You would be better off with:

a) getting a player with 6 or 8 discrete analog outs and internal DTS processing

b) get a consumer receiver with DTS master or true HD or whatever is the hottest thing atm, and taking the 6-8 channel discrete analog outs
 
Posted by Brad Miller (Member # 2) on 07-01-2013, 02:53 AM:
 
For not much more than a DMA8+ you can get the Gefen AV Cinema Pro 3 scaler which has DTS and Dolby decoding.
 
Posted by Chris Slycord (Member # 4239) on 07-01-2013, 03:10 AM:
 
And btw, your player can be set to only play the Dolby Digital and DTS tracks, especially since the coax output won't work with stuff like TrueHD/DTSMA. Then again, I imagine setting the output to coax probably defaults it to using the DD/DTS track.
 
Posted by Steve Guttag (Member # 268) on 07-01-2013, 05:35 AM:
 
Crestron has their HD-XSP (now shipping) that will decode any of the formats, including high-bandwidth (the Gefen box Brad mentioned is only a low-bandwidth decoder, as far as I can tell) so you can have DTS-Master HD and Dolby-True HD.

Crestron HD-XSP

BTW...out of curiosity. Since the Oppo will decode most everything and provide a discrete output...why not make/buy a suitable DB25 to RCA cable and plug it into the "Film" input of the DMA8 +?
 
Posted by Anhtu Vu (Member # 7689) on 07-01-2013, 10:44 AM:
 
Thanks for the replies....maybe i should give you guys more details regarding our set up, anyways after much research and testing we settle for the CP650 and DMA8+ combo. It was the best compromise we could find, i said compromise because there was nothing out there that could fully satisfy our needs.

We need machines that can accomodate the following inputs with access to any of them with ONE button pushed.

1-DCP (7.1 via AES)
2-HDcamSR (5.1 via AES)
3-Computer/AJA (5.1 via analog)
4-Digibeta (Stereo via AES or Analog)
5-BluRay (via Coax)
6- 2 x 35 mm
7- 16 mm

We looked at the Dolby, Datasat, QSC DCP300 and Gefen, Barco and analog way scalers.

quote: Bajsic Bojan
a) getting a player with 6 or 8 discrete analog outs and internal DTS processing
b) get a consumer receiver with DTS master or true HD or whatever is the hottest thing atm, and taking the 6-8 channel discrete analog outs
The player does have analog out but we absolutely want to to go in the DMA8+ via coax

quote: Chris Slycord
And btw, your player can be set to only play the Dolby Digital and DTS tracks, especially since the coax output won't work with stuff like TrueHD/DTSMA. Then again, I imagine setting the output to coax probably defaults it to using the DD/DTS track.
Yes, i'm aware of that...if one uses the coax out on the Oppo, it will simply output DTS or AC3 so i will have the same problem therefore my quest for a DTS-AC3 transcoder.

quote: Steve Guttag
BTW...out of curiosity. Since the Oppo will decode most everything and provide a discrete output...why not make/buy a suitable DB25 to RCA cable and plug it into the "Film" input of the DMA8 +?
The Film analog input is already being used for the computer/AJA

The only solution i can think of was to put the Computer/AJA and BluRay 5.1 analog out on a patch....but we really would love to avoid such scenario as we want to access all sources with ONE button pushed.
 
Posted by Bajsic Bojan (Member # 4928) on 07-01-2013, 11:19 AM:
 
That's why Yamaha DME64N is very popular in some places. Lots of I/O (64 channels). Might be two pushes of a button tho.

OTOH, it is already two pushes if you change things on a DMA and have to press 11 on the 650. Or is there a command to do it automatically with a change on the DMA?
 
Posted by Anhtu Vu (Member # 7689) on 07-01-2013, 12:06 PM:
 
quote: Bajsic Bojan
That's why Yamaha DME64N is very popular in some places. Lots of I/O (64 channels). Might be two pushes of a button tho.
If i need to access it via two push than i will settle for a simple 5.1 patch bay

quote: Bajsic Bojan
OTOH, it is already two pushes if you change things on a DMA and have to press 11 on the 650. Or is there a command to do it automatically with a change on the DMA?
Nope one push only...there's a way to automate the CP650 via the DMA8+....any button accessed via the DMA8+ will automatically put the CP 650 to analog input (11).
 
Posted by Steve Guttag (Member # 268) on 07-01-2013, 12:46 PM:
 
I come back to Crestron/AMX...one button push and configurable. You and I definitely do things differently. Note, we have used the QSC DCP and made our own relay based I/O panel that can expand an input...the DCP can activate the I/O panels so it would get the 1-button push thing for you. But that isn't what you have.

Personally, I wouldn't compromise the BluRay's sound by forcing the Coax solution...since you do HDCAM...the DMA8 was a no brainer since it will also do Dolby-E...something any HDCAM/HDCAM-SR house should be able to to handle.
 
Posted by Chris Slycord (Member # 4239) on 07-01-2013, 06:45 PM:
 
If the DMA8+ (with no DTS) is the only option for you at this point, it's possible to rip the DTS-only blu-rays on your PC, extract out the audio, transcode it to ac3, then burn a new blu-ray using the ac3 audio. But that might be overkill.
 
Posted by Anhtu Vu (Member # 7689) on 07-01-2013, 08:46 PM:
 
quote: Steve Guttag
I come back to Crestron/AMX...one button push and configurable. You and I definitely do things differently. Note, we have used the QSC DCP and made our own relay based I/O panel that can expand an input...the DCP can activate the I/O panels so it would get the 1-button push thing for you. But that isn't what you have.
Can you please tell me more about the Creston/AMX. Which model ?? I'm open to any suggestions that can simplify the workflow of our projectionists. Thx
 
Posted by Steve Guttag (Member # 268) on 07-02-2013, 06:31 AM:
 
It isn't so much of a particular model...one obtains the components that its the situation and then creates the interface. With an AMX/Crestron solution, the system can be cable of most anything, control wise...they are the ultimate in control but it is up to the person programming the GUI to make it user friendly. Again, I point to the AFI/Silver photos where you can see what has been done in a cinema environment.
 
Posted by Anhtu Vu (Member # 7689) on 07-07-2013, 03:10 PM:
 
quote: Steve Guttag
Again, I point to the AFI/Silver photos where you can see what has been done in a cinema environment
Can you send me a link to the photos ???
 
Posted by Steve Guttag (Member # 268) on 07-07-2013, 03:23 PM:
 
Look in the picture warehouse here on Film-Tech.
 
Posted by System Notices (Member # 2357) on 07-11-2014, 03:19 AM:
 

It has been 368 days since the last post.


 
Posted by Jonathan Emery (Member # 7675) on 07-11-2014, 03:19 AM:
 
Does anyone here have experience with the audio decoder featured in the following link?

http://xlobby.com/news/2010/05/07/xlobby-dolby-digital-dts-audio-decoders-preview/

We only show BluRays on odd occasions and would like to be able to use the DTS soundtrack through our Dolby CP750 connecting this unit to the multi channel input with suitable cable. We are not in a position to afford the units that are mentioned previously in this thread.

Would appreciate any advice.

Jonathan.
 
Posted by Richard Fowler (Member # 893) on 07-11-2014, 04:32 AM:
 
We have that unit working in an art cinema for rare playback of Blurays. This is being run through a patch panel to a six channel input of a CP500. The drawback is the output level is low and we had to add pre-amps to the output of the decoder to boost and calibrate the channels to match other sources.
 
Posted by Jonathan Emery (Member # 7675) on 07-11-2014, 05:13 AM:
 
Thank you for your help and information.

Jonathan.
 
Posted by Ethan Dutcher (Member # 8319) on 07-15-2014, 01:04 PM:
 
I am having a very similar issue, I have a JSD-80 processor that decodes Dolby but not DTS. Unfortunately, Bluray discs very rarely come with anything except a DTS English track(every other language seems to have a dolby track though). The main issue I am running in to is that the JSD-80 only has two 8 channel inputs which are being used by my digital and film projector. There are also two coaxial inputs, but that only works if the disc has a Dolby track. I have three different DTS processors to work with; a generic Kenwood audio receiver, a Klipsch Promedia DD-5.1, and a DTS XD10.

I do have extra terminal blocks so I could send the coax to the kenwood receiver, then use the speaker outputs from the receiver to goto a terminal block and unplug the terminal block from the back of the JSD-80 and go straight from the kenwood to the amps, but that seems like a silly idea I don't like having to essentially unhook our process every time we run a bluray.

I have a DB25 to XLR break out cable, my current plan is to make a few RCA to XLR cables and go from the Bluray player to the Promedia with coax, then from the promedia to the DB25 cable with the RCA to XLR cables I will make, then to a DB25 switch that will take both my 35mm DB25 and this DB25 breakout cable and send that to my JSD-80.

Can anyone think of a better way? I tried using the XD10 in SPIDF mode, but got no output to the JSD-80 from it( I went from the bluray player to the XD10 through coax, and then to one of the coax inputs on the JSD-80 from the XD10 hoping the XD10 would send a decoded signal, but it didn't work). Obviously I'm try to keep the cost down for this otherwise I would just buy a new cinema processor and call it a day.
 
Posted by Carsten Kurz (Member # 5396) on 07-15-2014, 07:42 PM:
 
It's a common problem with many audio processors, except the AP20.

One option is to use DolbySurround/Prologic on the analog or PCM stereo outputs and enable matrix decoding on the AP20 input.

Sooner or later you may want a switch between BluRay 8ch and 35mm analog input.

Why do you use the 8ch input of the JSD80 for your film projector, when the JS80 can do the optical track decoding? Is there a DA20 or DTS unit connected to the 8ch in?

- Carsten
 
Posted by Carsten Kurz (Member # 5396) on 07-15-2014, 09:42 PM:
 
quote: Carsten Kurz
One option is to use DolbySurround/Prologic on the analog or PCM stereo outputs and enable matrix decoding on the AP20 input.
Sorry, of course this should read 'enable matrix decoding on the JSD80 input'.

The AP20 will do dts over S/P-DIF and Toslink, and DTS HD over HDMI, in addition to AC3/DD.

- Carsten
 




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