On Thu, 30 Dec 2004, Dave VanHorn wrote:

>> I *did* say 45db insulation ;-). You are right, for a more demanding 
>> application it would require mutes or a T switch arrangement (a 4066 can 
>> be used for each input, providing both pass and shunt, before and *after* 
>> the pass. That would be a PI switch I think. Also cheap). However Robert 
>> is into flying and I suspect that this is for intercom type sources where 
>> 45dB isolation is luxurious ime.
>
> If you want a real adventure in oddities, look at how audio is handled in an 
> aircraft environment.  The only explanation I've really been given, is 
> "because they do it that way".

I don't know much about that but from the little I know I think that a 
good simulator would be a voice powered talking tube at least 10 meters 
long used while a running coffee grinder is held to the listener's ear 
and the talker has a bad case of throatache. I also think that some 
manufacturers believe that ground loops remain on the ground when 
equipment is used in the air. On the other hand, noise cancelling 
headphones are great invetions.

Peter
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist