Re: Specs on the Audigy 2 spdif connector.?
From: Max (r.cameronNOSPAM_at_Btinternet.com)
Date: 12/18/04
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Date: Sat, 18 Dec 2004 16:44:43 -0000
If you want some more reading have a look at this thread:
http://forum.ecoustics.com/bbs/messages/1/2098.html
Roger
"Stephen Neal" <stephen.neal@nospam.as-directed.com> wrote in message
news:cq1h41$g50$1$8300dec7@news.demon.co.uk...
>
> "kalev-" <me@privacy.net> wrote in message
> news:32h7vrF3niv9tU1@individual.net...
>> I'm confused...just need to check..
>>
>
> I have an Audigy 2 NX (which has RCA Phono and Toslink optical SPDIF
> interconnects rather than the 3.5mm ones) - however I did some research
> prior to buying.
>
>> the spdif connector is a regular 3.5mm copper (stereo) connector?
>> From what I read, Creative thus puts different PCM streams on the LEFT
>> and
>> RIGHT? (To negating any possible encoding licensing fees to Dolby I'm
>> sure..etc..)
>>
>
> Not sure - but think the Creative proprietary multichannel digital audio
> output is multiple SPDIF PCM ("stereo") streams, and may use a 3.5mm jack
> with more than the 3 conductors you might expect? Presumably each SPDIF
> PCM stream carries a stereo pair, so 5.1 would require 3 SPDIF streams (4
> contacts), and 6.1/7.1 would require 4 streams (5 contacts)
>
> When in passthrough mode the Dolby Digital or DTS audio is carried over
> SPDIF (but not as uncompressed PCM) so only a single pair of contacts are
> required. In this mode I would expect the 3.5mm jack to carry the correct
> SPDIF audio on the contacts that a mono 3.5mm jack would contact with, to
> allow a regular "mono" 3.5mm to single RCA phono (COAX SPDIF) cable to be
> used?
>
>> So in order for any AC-3 passthrough-mode to work (to an AV receiver with
>> a
>> coax/RCA connnector.. you need to to *combine* 2 PCM streams?!
>> (All advice I find talks about using a 3.5mm mono-plug??)
>
> Nope - the Audigy won't be outputting PCM in passthrough - it will be
> outputting Dolby Digital or DTS - that is the point of passthrough (it
> means it isn't decoded to PCM uncompressed but remains compressed)
>
> I'd imagine that the Audigy 2 only outputs passthrough SPDIF (and no PCM)
> on the pins require for a dual contact (aka. mono) 3.5mm jack to work?
>
>>
>> Shouldn't just a stereo 3.5mm stereo suffice, either the LEFT or RIGHT
>> would
>> have the AC-3 bit-stream? Anyone follow me on this? ...help..
>>
>>
>
> Suspect that a stereo 3.5mm would work as well - with the SPDIF stream
> available on one or both (depending on how the mono contacts are defined?)
>
> Steve
>
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