In article , Dave Plowman
writes
In article ,
Kalman Rubinson wrote:
One OEM I spoke with (and whose devices seem suitable) said that
receivers could easily and cheaply be included in self-powered
speakers. Unfortunately, all the 'high-end' speaker manufacturers
evinced curiousity but no real interest.


Hmm. If it could be done easily and cheaply at decent quality, why are
good quality radio mics so expensive?


Cos the pick up transducer costs a lorra dosh Dave. We're only talking
about a simple link here that I doubt would be good enough for a radio
mic and its environs.

Apart from that they aren't mass produced items are they?..
--
Tony Sayer

you can sync a machine to sub millisecond precision easily over WiFi
which
is probably OK for home theater.

Maybe, but at 20kHz being out by just 25 *micro* seconds is 180degrees out
of phase, the same as reversing the polarity for wired speakers.

How much this matters with all the little nodes from 4 speakers in play
I'm not sure.

--
Jim H jh
@333
.org

you can sync a machine to sub millisecond precision easily over WiFi
which
is probably OK for home theater.

Maybe, but at 20kHz being out by just 25 *micro* seconds is 180degrees out
of phase, the same as reversing the polarity for wired speakers.

How much this matters with all the little nodes from 4 speakers in play
I'm not sure.

--
Jim H jh
@333
.org

In article ,
tony sayer wrote:
Hmm. If it could be done easily and cheaply at decent quality, why are
good quality radio mics so expensive?


Cos the pick up transducer costs a lorra dosh Dave.

Really? ;-) Usually less than 10% of the cost - often much less.

We're only talking about a simple link here that I doubt would be good
enough for a radio mic and its environs.

I'd say it would suffer from many of the problems that radio mics do - the
home is quite a hostile environment for RF these days.

Apart from that they aren't mass produced items are they?..

True. But then to get real economy of scale you'd need to sell a lot. And
I'm not sure the demand is there.

--
*If at first you do succeed, try not to look too astonished.

Dave Plowman London SW 12
RIP Acorn

In article ,
tony sayer wrote:
Hmm. If it could be done easily and cheaply at decent quality, why are
good quality radio mics so expensive?


Cos the pick up transducer costs a lorra dosh Dave.

Really? ;-) Usually less than 10% of the cost - often much less.

We're only talking about a simple link here that I doubt would be good
enough for a radio mic and its environs.

I'd say it would suffer from many of the problems that radio mics do - the
home is quite a hostile environment for RF these days.

Apart from that they aren't mass produced items are they?..

True. But then to get real economy of scale you'd need to sell a lot. And
I'm not sure the demand is there.

--
*If at first you do succeed, try not to look too astonished.

Dave Plowman London SW 12
RIP Acorn

On Sun, 07 Dec 2003 18:25:05 -0000
Jim H wrote:

you can sync a machine to sub millisecond precision easily over WiFi
which
is probably OK for home theater.

Maybe, but at 20kHz being out by just 25 *micro* seconds is 180degrees out
of phase, the same as reversing the polarity for wired speakers.

How much this matters with all the little nodes from 4 speakers in play
I'm not sure.

indeed, but 50us is back *in* phase again so its never clear cut anyway ;-)

certainly 'OK' for a cheap solution though.

--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup.

On Sun, 07 Dec 2003 18:25:05 -0000
Jim H wrote:

you can sync a machine to sub millisecond precision easily over WiFi
which
is probably OK for home theater.

Maybe, but at 20kHz being out by just 25 *micro* seconds is 180degrees out
of phase, the same as reversing the polarity for wired speakers.

How much this matters with all the little nodes from 4 speakers in play
I'm not sure.

indeed, but 50us is back *in* phase again so its never clear cut anyway ;-)

certainly 'OK' for a cheap solution though.

--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup.

How much this matters with all the little nodes from 4 speakers in play
I'm not sure.

indeed, but 50us is back *in* phase again so its never clear cut anyway
;-)

Ah, but 50us is then 180 out of phase for a 10Hz tone! I think we'd just
have to accept that the speakers would be out of phase.

certainly 'OK' for a cheap solution though.

I'm pretty sure you're right. Remember though that the speakers would
still need to be plugged in, so in many cases it'd be no easier than
normally wired stuff. IIRC, it's possible to send digital information
through mains wiring - might be a viable non-wireless solution?

Btw, I take issue with your I hate java section best to keep it OT
though.

--
Jim H jh
@333
.org

How much this matters with all the little nodes from 4 speakers in play
I'm not sure.

indeed, but 50us is back *in* phase again so its never clear cut anyway
;-)

Ah, but 50us is then 180 out of phase for a 10Hz tone! I think we'd just
have to accept that the speakers would be out of phase.

certainly 'OK' for a cheap solution though.

I'm pretty sure you're right. Remember though that the speakers would
still need to be plugged in, so in many cases it'd be no easier than
normally wired stuff. IIRC, it's possible to send digital information
through mains wiring - might be a viable non-wireless solution?

Btw, I take issue with your I hate java section best to keep it OT
though.

--
Jim H jh
@333
.org

On Sun, 07 Dec 2003 20:34:16 -0000, Jim H
wrote:

I'm pretty sure you're right. Remember though that the speakers would
still need to be plugged in, so in many cases it'd be no easier than
normally wired stuff.

I think easier is the point. Running long wires around the perimeter
of the room past (or over) several doorways or drilling holes to run
the wires below floors is much more work than plugging the speakers
into a power outlet.

IIRC, it's possible to send digital information
through mains wiring - might be a viable non-wireless solution?

Sure, soon as someone implements the interfaces.

Kal