Re: Bi-directional audio over power cable

JosephKK wrote:
On Tue, 16 Dec 2008 12:43:40 +0100, "David Bourgeois"
<david@xxxxxxxxxxxxxx> wrote:

On Tue, 16 Dec 2008 00:48:36 +0100, Eeyore <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:


RFI-EMI-GUY wrote:

David Bourgeois wrote:
On Mon, 15 Dec 2008 12:53:46 +0100, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:

Third option is to use the optical fiber and stream UDP audio. Here
it
sounds like a more complex architecture to design, but maybe I could
find
commercial modules that handle that already so it might be the
easiest
option in the end.
Convert to the audio to SPDIF / AES3 or I2S Mind you that's in Mbps
land.
Hi Graham,

I forgot to tell that the fiber is already used for ethernet data, so
unfortunately I'm limited to IP if I want to use it.
I was wondering if you could get it to run over the power side actually and do
it balanced (differential) to avoid the noise issues.
That's an interesting idea indeed, balanced AES3 could be used but if I'm correct that can't be used for full-duplex. I guess a custom design could use some kind of time-multiplexed signal to achieve full-duplex.


There are some IP intercom modules out there, but I think they require a
server, not peer to peer.
http://en.wikipedia.org/wiki/Cobranet
Great modules there, a bit overkill for a single audio link so it's over the budget I expected, but it's a nice product. Thanks for the links.

David

Personally i would have used FM with a carrier around 4.5 MHz
piggyback on the RS-485 pairs. Just a suggestion.

You can have a different frequency subcarrier for the "east" vs. "west" directions and solve the "duplex" problem as well. But not sure about putting it on the RS-485 due to filtering issues.

--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P
.

Relevant Pages

  • Re: Bi-directional audio over power cable
    ... commercial modules that handle that already so it might be the easiest ... There are some IP intercom modules out there, but I think they require a server, not peer to peer. ... "Treason doth never prosper: what's the reason? ...
    (sci.electronics.design)
  • Re: Bi-directional audio over power cable
    ... commercial modules that handle that already so it might be the ... use some kind of time-multiplexed signal to achieve full-duplex. ... server, not peer to peer. ... a bit overkill for a single audio link so it's over ...
    (sci.electronics.design)