Thanx, Great info, but this is not exactly what I am after...
I have 2 or 3 digital stereo sources that are already SP/DIF.  I want =
two of theese or hopefully all six into a single digital signal to send =
to digital home cinema decoders...

any more info ?

----- Original Message -----=20
From: "Chris Carr" <nyed@BTINTERNET.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, February 22, 2001 10:15 AM
Subject: Re: [PICLIST] [PIC] How much "PIC-power" to do SP/DIF =
multichannel ?


> I would take a look at the Crystal Semiconductor Products
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> http://www.cirrus.com/
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> In the first instance and just use a PIC to control them
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> Goto http://www.cirrus.com/design/products/index.cfm?DivisionID=3D3
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> and look at the applications down the right hand side
> for some ideas
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> Regards
> Chris
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> I have been fondling with the idea of using a pic to parse two stereo =
SP/DIF
> (Actually TTL, but same format :-) signals from a Soundblaster Live =
card, or
> 5.1 card.
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> Creative was simply to cheap to include such horsepower, instead they =
made
> the Live 1024 card with two stereo digital outputs for Front =
left/ringht and
> Back left/right. (And the plug also delivers some power to a output =
module)
> In the 5.1 They did away with the output module power, and added the =
third
> digital channel for the center and subwoofer... Or, so it seems =
because the
> card has two more channels, and the old output module won't work =
anymore.
> I read somewhere that four channel SP/DIF in normal PCM mode is =
possible, so
> the question would be: Who will make something :-)  I just had to take =
a
> closer look at this !
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> How much power would I possibly need ???
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> I already know that for each sample, two 32-bit words are transmitted, =
which
> results in a bit-rate of:
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>     2.8224 Mbit/s  (44.1 kHz samplingrate, CD, DAT)
>     3.072  Mbit/s  (48 kHz sampling rate, DAT)
>     2.048  Mbit/s  (32 kHz sampling rate, for satellite purposes)
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> All of theese would be nice to handle, but the Soundblaster only uses =
48
> kHz...
> BUT, if the data is NOT PCM, we shouldn't change it, cause then it =
might be
> AC3 or something.  This should be passed straight trough...
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> The question is if it can be done, and most of all: with some pic ???
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>     KreAture
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> --
> http://www.piclist.com hint: The list server can filter out subtopics
> (like ads or off topics) for you. See http://www.piclist.com/#topics
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>=20

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