Microphone interference

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4 total messages Started by Anthony Berno Mon, 06 Apr 1992 18:36

#673

Author: Anthony Berno
Date: Mon, 06 Apr 1992 18:36

15 lines
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Has anyone been having as much trouble as I have with noisy microphones?  
Now that I'm (trying) to use Simon Says, every microphone I try sounds  
like a hornet's nest, there is so much 60 hz buzzing. The source of the  
radiation is clearly the monitor - I have a "vintage" monitor without the  
built-in microphone.

The only mike I have tried that does not give horrendous background noise  
is a little tie clip number that I've had for a while, but it has a  
battery that will wear out in only a few hours.

Do the newer monitors give out less of a field, or is this a problem with  
all of them?? Does anyone have any suggestions?

-Anthony

Re: Microphone interference

#1507

Author: Paul B. Verket
Date: Mon, 06 Apr 1992 22:37

14 lines
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aberno@godel.questor.wimsey.bc.ca (Anthony Berno) writes:
: 
: Has anyone been having as much trouble as I have with noisy microphones?  
: Now that I'm (trying) to use Simon Says, every microphone I try sounds  
: like a hornet's nest, there is so much 60 hz buzzing. The source of the  
: radiation is clearly the monitor - I have a "vintage" monitor without the  
: built-in microphone.
: ...Does anyone have any suggestions?

I also have a "vintage" monitor and had the same problem with a "dynamic -
moving coil" headset mic. I replaced it with an Audio-Technica electret
mic and the 60Hz noise went away.

Paul Verket (NeXTmail ok)

Re: Microphone interference

#734

Author: Ken Morton
Date: Tue, 07 Apr 1992 00:00

21 lines
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	I just ordered a stenographer headset mic that claims to have
a noise cancelling element.  A noise-cancelling mic is usually
defined as two discrete mic elements place as physically close
together as possible, with there outputs 180 degress out of phase
with each other.  Neat huh?  Everything more than a few inches (or less)

from the elements cancels itself out.  The mlic is oriented so your
voice hits one element much more than the other.

	I imagine it would help cut out 60hz noise as well (exactly
like a humbucking guitar pickup).

			I'll tell you chaps how it works out.


					Ken

-- 
Ken Morton			Breath of Fresh Air Music Productions
kmorton@panix.com
Send me NeXTmail!!!  	Black Computers are the NeXTstep in Computing!

Re: Microphone interference

#796

Author: Greg Cockroft
Date: Tue, 07 Apr 1992 16:10

33 lines
1466 bytes

Anthony Berno writes
> 
> Has anyone been having as much trouble as I have with noisy microphones?  
> Now that I'm (trying) to use Simon Says, every microphone I try sounds  
> like a hornet's nest, there is so much 60 hz buzzing. The source of the  
> radiation is clearly the monitor - I have a "vintage" monitor without  
the  
> built-in microphone.
> 
> ....
> 
> Do the newer monitors give out less of a field, or is this a problem  
with  

My guess is that it is an impedance problem. I get horrible 60hz humm if I  
hookup a headset mike that has a line transformer and put the high/low  
impedance switch in the wrong position. This is with a new monitor.

I've also notice that the external mike input on the old and new monitors  
are different. A mike that works on an old monitor may not work good on a  
new monitor.

	-greg.





-- 

Greg Cockroft                       greg@agog.com    
Agog, Inc.                          (517) 627-2186   fax 2673
13780 North River Highway

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