Use could also use a noise canceling mike.

It's used in MOBILE environments with tons of noise.

I use one on my radio and they are *very* *very* *extremeley* effective.

Of course the car isnt that noisy either :D

Andrew

On Thu, 9 Mar 2000 15:18:57 -0500 Dan <D.J.Burgess@EXETER.AC.UK> writes:
> If your audio is going onto your pc its probably a lot less
> hassel to use software to do any noise reduction/filtering.
> There's loads of audio dsp software about even at
> reasonable prices I think?. I think cool edit pro is
> shareware and can do this sort of thing on most common
> audio formats.
>
>
> On Thu, 9 Mar 2000 06:52:45 -0800 David Covick
> <dac@WEST.NET> wrote:
>
> > Duilio,
> >
> > Depending on what frequencies you are trying to filter out and
> those of
> > interest........
> > You could implement a lowpass, highpass or bandpass filter.
> > This could be done quite simply with an op-amp and approximately 2
> resistors
> > and 2 capacitors for the lowpass or highpass.  Double the hardware
> just
> > mentioned and combine the two for a bandpass filter.
> > This is all for a single voltage power supply.
> > If you have a dual polarity power supply you could do a bandpass
> filter with
> > just one op-amp.
> >
> > David
> >
> >
> > ----- Original Message -----
> > From: Duilio Foschi <foschid@SHUTTLE.ETRURIA.NET>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Thursday, March 09, 2000 7:47 AM
> > Subject: recording w/o noise
> >
> >
> > > I am preparing a tutorial for my new application using Lotus'
> ScreenCam.
> > >
> > > I have done all the video recording and now have to add the
> voice track.
> > >
> > > This is easily done (at least in theory) using the mic attached
> to the
> > > sound card of my PC.
> > >
> > > The problem is:
> > >
> > > all sort of noises enter my room from down the street and in all
> the tests
> > > I made the noise is well audible in the recorded track.
> > >
> > > Still I have all my things here and would hate to migrate to a
> different
> > > place.
> > >
> > > Also I guess that if I don't rent a professional recording room
> - what
> > > would be expensive and troublesome - I will find noise - more or
> less -
> > > everywhere.
> > >
> > > Is there a hw solution (a special mic ?) to filter out the noise
> when
> > > recording and/or a sw solution (Goldwave ?) to filter out the
> noise from
> > > the WAV file after the recording ?
> > >
> > > Thank you
> > >
> > > Duilio Foschi
> > >
>
> ----------------------
> Dan
> University of Exeter

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