ac3 and ADAT? - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 6th March 2009, 02:46 PM   #1
diyAudio Member
Join Date: Feb 2009
Default ac3 and ADAT?

This may have been asked before, but I want to concert a digital signal out of a DVD player to pure analog.

I know that these use DTS and AC3 signals, but I was thinking about using an ADAT converter (like the ADA8000), to convert the signal. This unit seems to have the same bit rates as a surround sound signal, and can concert 8 signals at once (like 7.1). Tried contacting Behringer, but to no avail.

One person I spoke to seems to think it might work, another said it will, but will mix up the channels (not really a problem). Another said no way.


I dont want to use a dolby decoder (so please dont suggest it, I have a beer budget!).

Otherwise, anyone else have an idea how to decode a signal from a DVD player to analog. This is an idea me and some people are working on as a hobby for an outdoor cinema using P.A speakers.
  Reply With Quote
Old 6th March 2009, 04:48 PM   #2
diyAudio Member
Join Date: Jan 2008
Location: Virginia
Well, that device is just the DAC part. That means it handles UNCOMPRESSED digital audio - PCM type.
The 5.1 digital output from DVD it is an compressed signal, encoded as Dolby Digital or DTS. This is because on a SPDIF connection you cannot cram more that 2 uncompressed audio channels.
If you want is like the mp3's versus the stereo PCM. DAC's don't know what to do with that signal directly...
So you need a decoder.
  Reply With Quote
Old 7th March 2009, 02:19 AM   #3
diyAudio Member
Join Date: Feb 2009
So, what your saying is, a 5.1 signal from a DVD player is compressed into a sp/dif signal, and when it goes into a reciever on a home cinema (for example), it is decompressed back into a 5.1 signal?

Do you know of a cheap decoder, (or even a kit), that can concert 5.1 or 7.1 from a DVD player to analog?

I already have a behringer ULTRAMATCH PRO SRC2496, will this help the cause?
  Reply With Quote
Old 7th March 2009, 08:09 PM   #4
diyAudio Member
Join Date: Jan 2008
Location: Virginia
The analogic 5.1 channels recorded in the recording studio are compressed in the studio in one (or both) of the lossy formats - Dolby Digital or DTS and put on the DVD as such (see their labels). In this way the bitrate is small enough to save space and to be passed over a SPDIF connection that DVD players have - coax or optical. In the digital receiver, the signal is decoded and results 5.1 digital channels (actually 3 stereo) and these are feeding the DAC's and from there go to the power amplifiers that feed the speakers. You have only the DAC part. A decoder should have DolbyDigital and/or DTS logo on it.

There used to be some stand-alone decoders (Creative used to make one that was USD150 ) but now there are none. New I mean. Maybe because players with integral decoders and 5.1 analog outs are less than $100 now a days. And you can find home theatre systems with about USD150-200.

PS: I don't know if you care, but the stereo signal that comes from a CD it is uncompressed PCM and therefore better quality. The only HiRes surround option is a DVD-A and SACD player.
  Reply With Quote
Old 8th March 2009, 05:15 AM   #5
diyAudio Member
Join Date: Feb 2009
Think I may have found 1 solution called the "Creative DDTS-100 Decoder", but it looks like its been discontinued.

I checked the online store here in Australia, and several places used to sell it.

Who knows of a simular unit? Or where in Australia I can get one?
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY ADC/DAC with ADAT echosystm Digital Line Level 1 8th May 2009 10:34 PM
analog i/o to ADAT Tophe_garage Digital Source 7 11th May 2007 05:24 PM
Adat connectors rEs Parts 1 9th March 2006 10:49 PM
PC motherboards with ADAT on the way. neutron7 Digital Source 2 20th February 2006 08:44 AM
8-channel A/D adat meta Digital Source 6 22nd November 2002 04:53 PM

New To Site? Need Help?

All times are GMT. The time now is 02:27 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2