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Old 6th December 2003, 07:36 PM   #21
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If IEEE1394 is not to your liking there are at least three other options.

SMPTE 324M. 12ch over AES3.
Sony SuperMAC. From 6ch at 384kHz to 48ch at 48kHz and
24ch DSD. Uses the physical ethernet layer
AES47. Seems to be AES10 over ATM 50+ channels.

ray
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Old 3rd May 2004, 03:14 PM   #22
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Great work Brian!

Could you please post the Gerbers of the DSD to PCM conversion board too?

Did you then give a try to SM5819AF DSD->PCM conversioin chip?

On which player did you succesfully installed the boards?

Sorry for all these questions!
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Old 11th May 2004, 03:30 AM   #23
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DSD - PCM MuxIt Transmitter Schematic
(.zip of .pdf)

(Sorry about the poor resolution. I had to keep it under the file size limit.)
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File Type: zip dsd - pcm muxit transmitter.zip (74.7 KB, 308 views)
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Old 11th May 2004, 03:35 AM   #24
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DSD - PCM MuxIt Transmitter Gerbers
(.zip of 274x)

Note that I ended up isolating pin 74 of the SM5816AF (XMTPCM). I then connected this pin to the DSD mode pin of a Sony DVP-NS500V SACD player.
(The Sony had garbage on the DSD lines when it wasn't playing an SACD. This mod mutes the output when an SACD isn't being played.)
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Old 11th May 2004, 03:46 AM   #25
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Quote:
Originally posted by Michele Spinolo
Great work Brian!
Thanks Michele!
Quote:
Could you please post the Gerbers of the DSD to PCM conversion board too?
It took me a bit to dig up these old files, but here they are.
Quote:
On which player did you succesfully installed the boards?
A Sony DVP-NS500V and a Pioneer DV-563A.
Quote:
Did you then give a try to SM5819AF DSD->PCM conversioin chip??
Not yet.

The Pioneer DV-563A has much easier access to its DSD and PCM signals, because it brings them across an FPC cable. I'd like to try making a SM5819AF based board that would directly plug in.

No, I'm not making any time estimates...

Regards,
Brian.
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Old 26th August 2004, 03:19 AM   #26
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Really impressive DIY work.

Regarding the use of ASRC, I wonder if you are interested in implementing flow control somehow with different physical link than LVDS. 1394 or USB would allow it, but I know the 1394 implementation is terribly complicated, and don't have a good idea on the complexity of USB for this purpose. However, if it can be done, you can get rid of the ASRC's and its possible negative effect on sound quality.

I also really wanted similar kind of systems, incorporating full digital processing for all CD/DVDA/DVDV/SACD signals, room correction, and most importantly digital active crossover for my future speakers...^^;
I have been thinking of different approach, as I was not convinced in the superiority of D-amp solution to analog high-end. I (un)fortunately have a big-*** analog stereo amp, and that's keeping me from full-digital amplification path, at least for now.
So my plan was to buy a processor with 1394, along with a universal player with 1394 audio output, and modify it to incorporate the wanted features. I might end up having to add another DSP with my custom features.

There are so many different ideas going on, but I am really glad to see people really pursuing this with real works. I hope we can share info. and ideas on this pure digital audio path.
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Old 5th September 2004, 09:43 AM   #27
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Hi Brian,

some news about the multichannel board for DV563 player?
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Old 27th October 2006, 02:42 PM   #28
peufeu is offline peufeu  France
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Hey that was interesting. What's up since you started this project ?

Meanwhile I've used other means to the same end :

http://audio.peufeu.com/
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Old 1st November 2006, 09:49 PM   #29
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" ... 1394 or USB would allow it, but I know the 1394 implementation is terribly complicated ..."

I don't know why this keeps coming up, but 1394 is actually less complicated than USB. (Peer to peer, slimmer address space, bi-directional double duplex (twice as many wires as USB), but 4 times the bandwidth.)

As long as your not planning to re-invent any wheels or writing a lot of mods to existing ACISs, you just use a decent TI 1394b hub chip and a choice audio ASIC.

These guys introduce 1394 DACs on a regular basis for pro musicians and studio work, just about every month: http://m-audio.com & http://rolandus.com

They simply pick from the litter of 1394 audio ASICs like this: http://www.oxsemi.com/oxford/documen...dio/audio.html ... then glue on some knobs & LEDs and package it nicely. Their latest is: http://www.m-audio.com/products/en_u...idge-main.html

This is something USB just can't do: multi-channel, bi-directional, 24 bit / 96k or better ...

" ... I also really wanted similar kind of systems, incorporating full digital processing for all CD/DVDA/DVDV/SACD signals ..."

Get a computer with a decent DVD player (of "universal" capabilities) and then build your 1394 DAC / A2D and plug 'er in.

(A mercenary announcement: http://industrialcomponent.com/firew.../fws46603.html ... $24 and the 6-pin port card fits any PCI bus equipped machine, Windows or Mac = no drivers required.)

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Old 17th December 2007, 10:40 PM   #30
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Hi,

@Brian (or anyone who can help.)

I'm just trying to layout some PCB designs for muxit interfaces using SRC4192's, but I'm a bit stuck about how to configure them.....

I see in the datasheet that they don't need to be linked for matched phase, but how should I set the MODE pins? I'm guessing the first chip should be set as master and the rest of the chips set as slave seeing that the output BCLK and LRCLK pins are tied together?

The crystals on the Audiotrak Prodigy I will be using as a source are 24.576MHz and 22.5792 - does this mean I should be using 512fs or 256fs mode?

I've attached a screenshot of how I have the chips connected atm (no master clock or reset yet etc.).

Also, is your master clock actually on your receiver board, or is it taken from your amp's master clock? What speed clock are you using on your receiver board (I can't quite make it out on the pdf file.)

I'm also assuming that if I was to modify my sound card with a muxit transmitter, is it a good idea to have a low jitter clock on the sound card as well as a low jitter clock for the master clock at the receiver end?

Another area of confusion is - do you use the same low jitter clock for both the ASRC reference clock and equibit amps?


Thanks,
OzOnE.
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