USB to 3*Spdif (Optical) - diyAudio
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Old 7th June 2012, 04:29 AM   #1
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Join Date: Apr 2011
Default USB to 3*Spdif (Optical)

Hi all,

This is going to be my first DIY project, so don't be too tough on me.
If it works, I would be happy to make some for whoever needs one.

Here is the project:
- USB input (need to support multi channels, minimum 6), need to support both 44.1khz and 48khz. 16 bit is enough.
- 3 stereo Spdif output (so in total 6 channels).

This is to be able to control 3 dacs with 1 computer.

I expect the overall design to be USB -> I2S -> 3 * I2S -> 3 * Spdif. Does this makes send or can I take any shortcut?


Step 1: Find the right USB chipset

Would any USB to I2S chip work to multi channel? Or does it need to be specially designed for multi channel?

I would opt for Tenor TE2077L. I found a board with USB input, TE2077L and I2S (LRCK, Data, MCK, BCK, GND) output.
USB 转 SPDIF 同轴 I2S处理器TE7022芯片支持24位96K采样-淘宝网

Else, can someone advice on a chip? I know CM108 support multi channels as it is used in some low end 5.1 sound cards.


Step 2: From I2S to 3*I2S to 3* Spdif
I have no idea, can someone advise me on what to look for?

Thanks,
Serge
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Old 8th June 2012, 11:12 AM   #2
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bump
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Old 8th June 2012, 11:40 AM   #3
JarekC is offline JarekC  Poland
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Join Date: Nov 2004
Location: Krakow
Refine your needs:
5.1 channles
or
3 independent stereo channels (will be use in the same time?)

It is a big difference

Best regards
JarekC
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Old 8th June 2012, 05:08 PM   #4
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Join Date: Apr 2011
The USB would be 5.1 channel input.

Then for the output: Each optical out would output PCM 2 channels. So 1 optical for Front chennels, 1 for Center/Sub, and 1 for Back
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Old 10th June 2012, 11:59 AM   #5
JarekC is offline JarekC  Poland
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Join Date: Nov 2004
Location: Krakow
Hi,

You can use TUSB3200C from TI, (Not recomended for new design but still available) and 3*WM8804 as SPDIF transmiters.
You must write own firmware for TUSB3200C.

Best regards
JarekC
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Old 12th June 2012, 02:28 PM   #6
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Join Date: Apr 2011
JarekC, thank you very much for this.
Would there be a USB chipset that does not require to write a firmware?
I have never programed a firmware before.
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Old 15th June 2012, 01:03 PM   #7
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Join Date: Mar 2012
Here is a simple solution:

LogiLink Dolby 7.1 Kanal USB 2.0 Sound Box extern | eBay

USB to S/PDIF and optical, as well as all outputs (front, rear, centre / bass) etc....

20 euro's only.
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Old 15th June 2012, 01:31 PM   #8
JarekC is offline JarekC  Poland
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Join Date: Nov 2004
Location: Krakow
I think that sergedc looking for device with USB In and 3 separate SPDIF outputs, not one SPDIF with 5.1.

Best regards
JarekC
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Old 15th June 2012, 02:47 PM   #9
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Join Date: Jun 2011
You might consider it a cheat but you could put a USB hub into the loop so
'USB -> 3* USB -> 3 * I2S -> 3 * Spdif' though at this point you could just use multiple USB (or PCI for that matter) sound cards...

If you are starting with dolby digital one option would be to look at what receivers use to pull apart the S/PDIF 5.1 data. If you could copy that circuit you could perhaps feed those streams into your DACs.
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Old 15th June 2012, 03:26 PM   #10
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Join Date: Apr 2011
Indeed, need 3 time optical out, one for each channel. If the 3.5m output of the LogiLink had spdif output too, that would be a good solution, but it does not.

I am not starting from Dolby Digital but from AAC 5.1 or DTS-HD (on my laptop).

Connecting multiple sound card is phisically easy but does not have a software solution that roots the different channels to the different sound cards (at least so I read).

Serge
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