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Re: Ethernet vs. Digital Audio Out
LightninJoe #144658 08/26/06 06:24 AM
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Obviously someone hasn't cold cocked Neil Armstrong.


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Re: Ethernet vs. Digital Audio Out
Ken.C #144659 08/26/06 07:29 AM
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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.

Re: Ethernet vs. Digital Audio Out
BrenR #144660 08/26/06 09:00 AM
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Apparently then, Violet was a favorite of the good boys(even better than fudge).


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Enjoy the music, not the equipment.


Re: Ethernet vs. Digital Audio Out
LightninJoe #144661 08/26/06 11:56 AM
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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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Re: Ethernet vs. Digital Audio Out
jmone #144662 08/26/06 12:00 PM
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I like puppies.


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Re: Ethernet vs. Digital Audio Out
MarkSJohnson #144663 08/26/06 01:00 PM
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Re: Ethernet vs. Digital Audio Out
BrenR #144664 08/26/06 05:41 PM
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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

Re: Ethernet vs. Digital Audio Out
pmbuko #144665 08/27/06 07:49 AM
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Quote:

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


Which are also the 7 layers of flirting for me.

Bren R.

Re: Ethernet vs. Digital Audio Out
BrenR #144666 08/27/06 09:31 PM
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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.




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Re: Ethernet vs. Digital Audio Out
LightninJoe #144667 08/28/06 02:38 AM
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Indeed.


-----------------------------------

Enjoy the music, not the equipment.


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