[linux-dvb] Re: AC3 via S-PDIF

[Mail-Account <nobody@koestler.net>]

Hello,

i have found an interesting link for S-PDIF.
The site tells how to build an TTL -> S-PDIF converter.

http://www.epanorama.net/documents/audio/spdif.html

hope this helps

Ralf

----- Original Message -----
From: "Klaus Schmidinger" <Klaus.Schmidinger@cadsoft.de>
To: <linux-dvb@linuxtv.org>
Sent: Tuesday, June 19, 2001 6:09 PM
Subject: [linux-dvb] AC3 via S-PDIF


> Maybe somebody with deeper knowledge about this can help me out here:
>
> I understand that an AC3 decoder accepts the digital data through
> either a coaxial or optical input line. That line (or the protocol?)
> is specified as "S-PDIF". This is a unidirectional link and there
> is no handshake.
>
> Since the hardware on the DVB-S card apparently can't be used to
> send the AC3 data stream to an external AC3 decoder (at least that's
> what the driver developers wrote here on the list, IIRC), and I don't
> want to install a sound card in my VDR box just because of the S-PDIF
> interface (it's not because of the costs, it's because such a card
> would occupy one of my valuable PCI slots ;-) I was wondering what
> is actually necessary to implement an S-PDIF interface. The electrical
> circuitry appears to be pretty trivial (see for instance "elektor" 7/8
2000,
> page 37). And the actual data I guess would consist mainly of the AC3
> data stream as received from the transponder. The question now is: does
> that data have to be modified in any way (like adding a ninth bit,
repackaging
> or stunts like that), or is it just to be sent "as is"?
>
> What I am thinking of would be a small electrical interface connected
> to the serial or parallel interface. The data could then just be sent to
> the respective device and we would not need any special sound card driver
> (and we would also not have to install a sound card :-)
>
> Is this idea in any way feasible - or am I missing something important
> here? Would the bandwidth of the serial or parallel interface be enough
> for the AC3 data stream?
>
> I do admit that my knowledge of S-PDIF is next to zero - but I hope
> to change that...
>
> Klaus
> --
> _______________________________________________________________
>
> Klaus Schmidinger                       Phone: +49-8635-6989-10
> CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
> Hofmark 2                               Email:   kls@cadsoft.de
> D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
> _______________________________________________________________
>
>
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