Wireless connection between dvd & audio system?
 

Hi,

In message , Kalman Rubinson
writes

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.

I've been wondering why someone hasn't done this kind of thing with
802.11. Assuming a surround delivery system, 6 channels of 24 bit, 96kHz
would need a bandwidth of about 14 Megabits per second uncompressed (if
my dodgy sums are right), which is well within the 802.11g wireless LAN
specs, even allowing for some protocol overhead. Dolby Digital or DTS
would be much lower due to compression/packing. It wouldn't be "low end"
and it would mean putting a cheap microcontroller or ASIC, a D/A and the
amp within the speakers, but that's nothing new. Anyone see a reason
this wouldn't work?

--
Glenn Booth

Wireless connection between dvd & audio system?
 

"Glenn Booth" wrote in message
...
Hi,

In message , Kalman Rubinson
writes

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.

I've been wondering why someone hasn't done this kind of thing with
802.11. Assuming a surround delivery system, 6 channels of 24 bit, 96kHz
would need a bandwidth of about 14 Megabits per second uncompressed (if
my dodgy sums are right), which is well within the 802.11g wireless LAN
specs, even allowing for some protocol overhead. Dolby Digital or DTS
would be much lower due to compression/packing. It wouldn't be "low end"
and it would mean putting a cheap microcontroller or ASIC, a D/A and the
amp within the speakers, but that's nothing new. Anyone see a reason
this wouldn't work?

The main problem I can think of is with timing. For this to work you need a
common time for all sources. That would be very difficult to do with an
802.11 network.

For data transmission you don't tend to notice if transmission is
interrupted for half a second, trying to synchronised two or more channels
would be somewhat different.

Wireless connection between dvd & audio system?
 

"Glenn Booth" wrote in message
...
Hi,

In message , Kalman Rubinson
writes

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.

I've been wondering why someone hasn't done this kind of thing with
802.11. Assuming a surround delivery system, 6 channels of 24 bit, 96kHz
would need a bandwidth of about 14 Megabits per second uncompressed (if
my dodgy sums are right), which is well within the 802.11g wireless LAN
specs, even allowing for some protocol overhead. Dolby Digital or DTS
would be much lower due to compression/packing. It wouldn't be "low end"
and it would mean putting a cheap microcontroller or ASIC, a D/A and the
amp within the speakers, but that's nothing new. Anyone see a reason
this wouldn't work?

The main problem I can think of is with timing. For this to work you need a
common time for all sources. That would be very difficult to do with an
802.11 network.

For data transmission you don't tend to notice if transmission is
interrupted for half a second, trying to synchronised two or more channels
would be somewhat different.

Wireless connection between dvd & audio system?
 

"Dave Plowman" wrote in message
...
In article ,
Kalman Rubinson wrote:
I said it could be included in an already self-powered speaker, itself
of not inconsequiential cost. If one has already invested the power
supply and amplifier, it was estimated that the receiver could be
added on for about $100. That was about 3 years ago.

OTOH, one might demand even higher quality in a mike feed than for a
surround channel speaker. I would.

Possibly. But radio mics are rarely used where the highest possible
quality is required, regardless of what some might believe.


They are in live and broadcast environments.
If you pay just short of 3 grand a set for them you get something that's
incredibly hard to differentiate from the same type of mic in a wired
version.

The quality and reliability of radio mics has improved immensly over the
last ten years.

Peter

Wireless connection between dvd & audio system?
 

"Dave Plowman" wrote in message
...
In article ,
Kalman Rubinson wrote:
I said it could be included in an already self-powered speaker, itself
of not inconsequiential cost. If one has already invested the power
supply and amplifier, it was estimated that the receiver could be
added on for about $100. That was about 3 years ago.

OTOH, one might demand even higher quality in a mike feed than for a
surround channel speaker. I would.

Possibly. But radio mics are rarely used where the highest possible
quality is required, regardless of what some might believe.


They are in live and broadcast environments.
If you pay just short of 3 grand a set for them you get something that's
incredibly hard to differentiate from the same type of mic in a wired
version.

The quality and reliability of radio mics has improved immensly over the
last ten years.

Peter

Wireless connection between dvd & audio system?
 

On Sun, 07 Dec 2003 10:41:03 GMT
"Bedouin" wrote:

The main problem I can think of is with timing. For this to work you need a
common time for all sources. That would be very difficult to do with an
802.11 network.

For data transmission you don't tend to notice if transmission is
interrupted for half a second, trying to synchronised two or more channels
would be somewhat different.

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

If you dont use TCP/IP you could probably do better still.


--
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.

Wireless connection between dvd & audio system?
 

On Sun, 07 Dec 2003 10:41:03 GMT
"Bedouin" wrote:

The main problem I can think of is with timing. For this to work you need a
common time for all sources. That would be very difficult to do with an
802.11 network.

For data transmission you don't tend to notice if transmission is
interrupted for half a second, trying to synchronised two or more channels
would be somewhat different.

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

If you dont use TCP/IP you could probably do better still.


--
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.

Wireless connection between dvd & audio system?
 

In article ,
Pete wrote:
Possibly. But radio mics are rarely used where the highest possible
quality is required, regardless of what some might believe.


They are in live and broadcast environments.

Yes. I work in the latter.

If you pay just short of 3 grand a set for them you get something that's
incredibly hard to differentiate from the same type of mic in a wired
version.

If only this was true, you'd never use another cabled mic.

The quality and reliability of radio mics has improved immensly over the
last ten years.

I'm not even convinced about that. They've got smaller, certainly. But the
move to UHF brought other problems.

--
*Why isn't 11 pronounced onety one? *

Dave Plowman London SW 12
RIP Acorn

Wireless connection between dvd & audio system?
 

In article ,
Pete wrote:
Possibly. But radio mics are rarely used where the highest possible
quality is required, regardless of what some might believe.


They are in live and broadcast environments.

Yes. I work in the latter.

If you pay just short of 3 grand a set for them you get something that's
incredibly hard to differentiate from the same type of mic in a wired
version.

If only this was true, you'd never use another cabled mic.

The quality and reliability of radio mics has improved immensly over the
last ten years.

I'm not even convinced about that. They've got smaller, certainly. But the
move to UHF brought other problems.

--
*Why isn't 11 pronounced onety one? *

Dave Plowman London SW 12
RIP Acorn

Wireless connection between dvd & audio system?
 

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