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#144658 - 08/26/06 02:24 AM Re: Ethernet vs. Digital Audio Out [Re: LightninJoe]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
Obviously someone hasn't cold cocked Neil Armstrong.
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#144659 - 08/26/06 03:29 AM Re: Ethernet vs. Digital Audio Out [Re: Ken.C]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
It's a mnenonic for something to do with network layering.

Like Every Good Boy Deserves Fudge for the 5 staff lines of the treble clef or Bad Boys Rape Our Young Girls But Violet Goes Willingly to remember resistor colour band values (yes, I was actually taught a more racist version of that in grade 10 electronics).

Bren R.

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#144660 - 08/26/06 05:00 AM Re: Ethernet vs. Digital Audio Out [Re: BrenR]
JohnK Online   content
shareholder in the making

Registered: 05/11/02
Posts: 10363
Apparently then, Violet was a favorite of the good boys(even better than fudge).
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#144661 - 08/26/06 07:56 AM Re: Ethernet vs. Digital Audio Out [Re: LightninJoe]
jmone Offline
veteran

Registered: 01/08/06
Posts: 155
Loc: Sydney Australia
Mmmmm you may want to read http://www.epanorama.net/documents/audio/spdif.html

For those interested in the data structure used for S/PDIF, it can transmite either audio sample (PCM) or data bits (DD / DTS) in an encapsulated 32-bit word (subframe) - as follows:
bits meaning
-------------------------------------------------
0-3 Preamble (see above; special structure)
4-7 Auxillary-audio-databits
8-27 Sample
(A 24-bit sample can be used (using bits 4-27).
A CD-player uses only 16 bits, so only bits
13 (LSB) to 27 (MSB) are used. Bits 4-12 are
set to 0).
28 Validity
(When this bit is set, the sample should not
be used by the receiver. A CD-player uses
the 'error-flag' to set this bit).
29 Subcode-data
30 Channel-status-information
31 Parity (bit 0-3 are not included

Seriously though, the real question is where you want to decode the data, and what devices you have that can do the required tasks – the transport layer is almost irrelevant. Both Ethernet and S/PDIF have the bandwidth required to transport DATA STREAMS required between devices - it is much more important to understnad what device in the chain has the CODEC required to convert it to an Analogue signal.

Typically a main steam Receiver (to date) handles the decoding and amplification of PCM, DD, DTS, and MPEG-Audio data streams transmitted over S/PDIF.

Support is now appearing in these moderate priced Receivers that can decode additional formats (eg MP3/WMA/SACD/DVD-A) as well as accept additional transport layers which these formats can be transmitted over (eg Digital Radio, Ethernet both in wired and unwired formats,USB etc).

Nathan
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#144662 - 08/26/06 08:00 AM Re: Ethernet vs. Digital Audio Out [Re: jmone]
MarkSJohnson Offline
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Registered: 09/27/04
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I like puppies.
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#144663 - 08/26/06 09:00 AM Re: Ethernet vs. Digital Audio Out [Re: MarkSJohnson]
Spoiler Offline
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Registered: 01/03/06
Posts: 680
Loc: South Florida
Cheese is good.
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#144664 - 08/26/06 01:41 PM Re: Ethernet vs. Digital Audio Out [Re: BrenR]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16259
Loc: Leesburg, Virginia
Bren was correct. My two mnemonics were for remembering the parts of the 7 layer OSI model, which has to do with computer networking:

Physical, Datalink, Network, Transport, Session, Presentation, Application
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#144665 - 08/27/06 03:49 AM Re: Ethernet vs. Digital Audio Out [Re: pmbuko]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
Quote:

Physical, Datalink, Network, Transport, Session, Presentation, Application


Which are also the 7 layers of flirting for me.

Bren R.

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#144666 - 08/27/06 05:31 PM Re: Ethernet vs. Digital Audio Out [Re: BrenR]
LightninJoe Offline
aficionado

Registered: 10/28/05
Posts: 558
Loc: Portland, OR
Quote:

It's a mnenonic for something to do with network layering.

Like Every Good Boy Deserves Fudge for the 5 staff lines of the treble clef or Bad Boys Rape Our Young Girls But Violet Goes Willingly to remember resistor colour band values (yes, I was actually taught a more racist version of that in grade 10 electronics).

Bren R.




Shizzle. All Cars Eat Gas. Funny thing is the pizza one started making neurons fizzle a little in the deep dark recesses.
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"That's some catch, that Catch-22." "It's the best there is." M22ti VP150 EP350 QS8 M3Ti

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#144667 - 08/27/06 10:38 PM Re: Ethernet vs. Digital Audio Out [Re: LightninJoe]
JohnK Online   content
shareholder in the making

Registered: 05/11/02
Posts: 10363
Indeed.
_________________________
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Enjoy the music, not the equipment.



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