I wish to implement two different shortish range highish quality udo systems
using infrared.
While there are both commercial designs and various circuits that do this
someone here may have useful input.

Application 1:

Microphone extender allowing a wheelchair confined user to connect to a
computer microphone input.
Allows use of eg Dragon naturally Speaking voice control without linking
wires.
range needs only be a few meters.
Quality of rendition must be excellent.
Sounds easy enough.

Application 2

From a number of sources (up to 4) take input audio and rebroadcast it via
infra-red such that any of the 4 channels can be selectively received by a
portable receiver. It is envisaged that the audio sources would originate in
selected hospital rooms and the audio signals would be able to be received
by nurses wearing receivers. Transmission would be by wire connected IR
transmitters which "spray" infrared over rooms / corridors concerned from
suitable points.
The aims here are lack of RF radiation in a controlled environment and as
long a battery life as possible for receivers.
RF would be much easier but is frowned on.
Voice quality need only be say telephone level (3 KHz ish BW).

One way transmission OK (fixed to mobile)
Doesn't sound too hard. Getting OK coverage may be annoying.


Anyone have any useful suggestions.








      Russell McMahon
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