SPDIF break out box

Nov 21, 2008 at 2:38am

SPDIF break out box

Hi max peepz,

I just got one of these new MBP (my 12″ pwbk died 4 months ago). These
new intel machines all have something called S/P-DIF Out: Connection:
Combo and S/P-DIF In: Connection: Combo, i.e optical multichannel
sound. I am wondering 1) whether there is some cheap magic box/mixer
that would let me convert these inputs to analog inputs and outputs
and 2) whether max msp would be able to treat these as discreet
channels in the DSP?

Cheers

(())_n

#40963
Nov 21, 2008 at 3:23am

Yes, you can connect the optical input/output to an external AD/DA converter which most likely could offer you better conversion than the built in analogue sound card.

I’m pretty sure the optical in/out is only stereo. I suppose (although have not tried it) you could get four channels of output by creating an aggregate device combining the optical and analogue outputs.

#145403
Nov 21, 2008 at 4:44am

Hi,

Thanks for the reply. I am pretty sure the optical connection has more
channels, but could not find any specs at apple. I did find this
article:

http://digitalprosound.digitalmedianet.com/articles/viewarticle.jsp?id=56671&afterinter=true

Anyone know of any boxes to convert the optical signal to analog
discreet channels and whether they would show up in the dac of max msp?

cheers

(())_n

On Nov 20, 2008, at 10:23 PM, Roth Michaels wrote:

> I’m pretty sure the optical in/out is only stereo. I suppose
> (although have not tried it) you could get four channels of output
> by creating an aggregate device combining the optical and analogue
> outputs.

#145404
Nov 21, 2008 at 6:43am

All I know about it is from looking in AudioMIDI setup. Any time I have used optical been stereo TOSLink from CD player to MINIDisc has been ADAT Optical from my MOTU.

It does appear as you can pass encoded surround sound through, as far as I can tell MSP can’t deal with that and your only option is two-channel PCM out the TOSLink. Be cool if you could prove me wrong, but it seems really designed just for DVD playback or other stereo S/PDIF uses.

#145405

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