anyone ever attempt somehting like this?
I have been spending some time checking out the zoran decoder on a chip. www.zoran.com. It is a surface mount chip, so that would cause some difficulty, but it looks like it could be simple enough for DIY purposes to get from a DVD player optical or digital output to RCA outputs for use with some gainclones or better. All the other decoding solutions I could find were DSP chips with unclear specifics as to who supplies the software...
I have been spending some time checking out the zoran decoder on a chip. www.zoran.com. It is a surface mount chip, so that would cause some difficulty, but it looks like it could be simple enough for DIY purposes to get from a DVD player optical or digital output to RCA outputs for use with some gainclones or better. All the other decoding solutions I could find were DSP chips with unclear specifics as to who supplies the software...
Sorry. Can't be done. Search the forum for threads on this topic.
Because of licencing issues, it is no where near feasible.
Because of licencing issues, it is no where near feasible.
Crap I just nuked my own post!
I was trying to insert this post about liscensing fees as they would likely apply to the EZ5.1 (ZR7386011)
The EZ5.1 (ZR7386011) looks like it would be well suited to a DIY aplucation, but it is a reference enviroment, not always the most cost effective for DIY.
I was trying to insert this post about liscensing fees as they would likely apply to the EZ5.1 (ZR7386011)
The EZ5.1 (ZR7386011) looks like it would be well suited to a DIY aplucation, but it is a reference enviroment, not always the most cost effective for DIY.
found some more threads here by not including DTS in my search this time. Is there a big quality difference between the different solutions used to do the decoding in mainstream receivers? I am thinking my best option at this point mainly due to financial reasons is to get a CHEAP receiver, like a $150 unit and then later on when finances permit it to redo the DAC's on out to the speakers with some gainclones. any chips or brands to avoid with this in mind?
Thinking similar thoughts and googling my brains out I found a handful of these things and posted this in an earlier thread:
I think this decoder costs less than $100 US. Ive been thinking about this or one of a few similar devices marketed for desktop computing as the decoder for a similar project.
http://www.videologic.com/Products/...roduct=VL-60510
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I think this decoder costs less than $100 US. Ive been thinking about this or one of a few similar devices marketed for desktop computing as the decoder for a similar project.
http://www.videologic.com/Products/...roduct=VL-60510
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Attachments
It would be interesting to see what kind of performance could be achieved with such a device if the incumbent A/D and D/A were bypassed and something a little more esoteric inserted.
I would also avoid the use of digital attenuation and gain, especially on a cheap core like this. Perhaps the DIPCHIP electronics guys could be persuaded to emulate some control code in order to bundle it with there relay based attenuator or digital crossover projects.
Here is the old DTS thread:
http://www.diyaudio.com/forums/showthread.php?s=&postid=194333#post194333
I would also avoid the use of digital attenuation and gain, especially on a cheap core like this. Perhaps the DIPCHIP electronics guys could be persuaded to emulate some control code in order to bundle it with there relay based attenuator or digital crossover projects.
Here is the old DTS thread:
http://www.diyaudio.com/forums/showthread.php?s=&postid=194333#post194333
it is actually about $180 with shipping to the USA. Still might be a beter option thatn a cheap receiver, unless one could find a receiver with the same Zoran chip in it...
While it is possible to get 6 individual compressed AC3/DTS datastreams, I have not seen any chips that put out 6 decompressed datastreams.
Given that the specs for both AC3 and DTS are freely available perhaps someone can design a board to create 6 uncompressed
datastream.
ray.
Given that the specs for both AC3 and DTS are freely available perhaps someone can design a board to create 6 uncompressed
datastream.
ray.
rfbrw said:
Uhm, unless you know the source, DTS is NOT freely available. AC3, in early incarnations can be found with some digging, though. (I used to have a copy of it, but I think I got rid of it) For AC3, look for standards about HDTV, as that's how I found my copy.
If you know of a source for DTS, I would be interested in seeing it.
Not entirely impossible...
Don't know if I should be saying this, but it can be done. A fellow student and I wanted to use a home cinema decoder as subject for research for our Masters Degree. Enquiries to both Dolby & DTS for academic licenses has been most favourable, especially from DTS. They've even offered to organize samples of the newest Motorola DSP's (THX-Ultra capabality etc.) which aren't even used in any commercial equipment yet. I doubt wheteher it would be useful to the DIY community as we had to provide full credentials, University details, references from mentor lecturers and even the dean. We'll try to post some of our research here (censored of course).
Pierre Watts
Don't know if I should be saying this, but it can be done. A fellow student and I wanted to use a home cinema decoder as subject for research for our Masters Degree. Enquiries to both Dolby & DTS for academic licenses has been most favourable, especially from DTS. They've even offered to organize samples of the newest Motorola DSP's (THX-Ultra capabality etc.) which aren't even used in any commercial equipment yet. I doubt wheteher it would be useful to the DIY community as we had to provide full credentials, University details, references from mentor lecturers and even the dean. We'll try to post some of our research here (censored of course).
Pierre Watts
The standards listings:
From the ATSC website:
http://www.atsc.org/standards/a_52a.pdf
Not a bad read at 140 pages, shouldnt be too tough to produce as C++ (but dont waight for me to do it)
The Errata Listings from the Dolby web site:
http://www.dolby.com/tech/ATSC_err.pdf
Note: errata seem to predate the ATSC listing and are therefore likely to be included in the document.
From the ATSC website:
http://www.atsc.org/standards/a_52a.pdf
Not a bad read at 140 pages, shouldnt be too tough to produce as C++ (but dont waight for me to do it)
The Errata Listings from the Dolby web site:
http://www.dolby.com/tech/ATSC_err.pdf
Note: errata seem to predate the ATSC listing and are therefore likely to be included in the document.
Publish or perish,
The bane of academics, and great resume material too.
Perhaps more importantly, depending on where you go with it, this sounds like it could also make a good AES journal article.
The bane of academics, and great resume material too.
Perhaps more importantly, depending on where you go with it, this sounds like it could also make a good AES journal article.
Not sure what you want to say with this but I would say all decoders do that...(unless you refer to spdif) that's what their job is. OK, you don't get 6 individual streams you get 3 pairs of decompressed datastreams, the lr clock to identify each one and the bit clock needed. Just as the signals that feeds any other PCM DAC chip.
If you want single streams as in a DIT you can add the AKM4101
8 ch DIT
I think it would be easier to get a commercial product and re-build it, besides getting usable digital audio data you also get timing adjustments and the dd or dts sonic "stamps" right.
I've managed to extract DD and DTS decompressed pcm data from the Motorola DSP56362 and Analog devices Melody 32bit processor.
The zoran would give you the same thing.
BTW I think zoran is used in Toshiba dvd players. Pioneer uses motorola and Denon uses analog devices melody.
I think you can get a new player that includes these for around $500.
Sound Blaster Extigy
I stumbled across this today while I was avoiding work:
The sound blaster Extigy claims to have a stand alone function where it will decode DTS w/ out setup from a computer.
http://www.soundblaster.com/products/extigy/tour.asp#easeofuse2
I stumbled across this today while I was avoiding work:
The sound blaster Extigy claims to have a stand alone function where it will decode DTS w/ out setup from a computer.
http://www.soundblaster.com/products/extigy/tour.asp#easeofuse2
AFAIK the extigy only does DD. If it can do DTS, let me know, because I have one at home. I use it mostly for digital I/O.
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