🚀 go-pugleaf

D <tarb@bk.ru> wrote in
news:1192480444.829585.145920@i38g2000prf.googlegroups.com: 

> Hello!
> A background (about 50hz) rumble appears in a sound from
> microphone. Windows XP SP2.
> I tried two headsets (which surely are good). The rumble
> decreases if I touch the computer case.

IMO, this undoubtedly means you have a ground problem. As if 
"about 50 Hz" was not enough of a tipoff. It's always 50 or 60.

But it MAY just be a totally crappy microphone. Try another one, 
preferably a good one.

If it's NOT the microphone, I am not a technician so I can't 
tell you how to fix it, but first thing you should do is check 
that everything to do with you system is plugged into the SAME 
AC circuit, preferably same outlet with power bar(s), and then 
you can buy or borrow (or steal I suppose) a little gizmo which 
you plug into the wall outlet and it tells you if everything's 
OK. Other than that, ask a technician.

> I checked the
> inside of the case, did not find any improper contacts. The
> sound card is Creative sound blaster live ct4830. I tried
> the latest Microsoft and Creative drivers. The Creative
> driver does not output sound from microphone to speakers at 
> the same time, but only from a recording from the
> microphone.

That si impossible. Check your mixer volumes, mutes etc.
Watch out for feedback, it can be VERY unpleasant, but no sound 
card manufacturer will disable mic to speakers direct just 
because of that. 

> How to prevent the rumble?
> Best regards,
> Dima




-- 
Waiting for the day when it is illegal to use anything but Vista 
on any computer in the world.