Thanks Ed, I'll keep fiddling with it in Matlab then :)
--- In Ed Anson <> wrote:
> Natalie,
>
> I have never used Matlab, so I'm just guessing. But it seems reasonable
> that the two columns would be left and right channel amplitude values.
> I don't suppose there is any single "right" way to analyze it. You
> could analyze each channel separately, or add them together to get a
> mono signal. Or both.
>
> As for Audacity, it is intended for editing sound, not for analysis.
> AFAIK it has no way to save the file as anything but audio. It sounds
> like Matlab is the tool you want.
>
> Ed
>
>
> On Oct 2, 2005, at 6:21 PM, nbioacoustics wrote:
>
> > Hi Ed,
> >
> > Ok, so now that I know I can import WAV files into Matlab (which I
> > did), I'm having trouble figuring out what the 2 columns of data are.
> > Are they both amplitude, 1 column for each headphone (L and R)? I
> > think so.
> >
> > If so, then is there any 'right' way to combine them to get the TOTAL
> > signal?
> >
> > Also, in Audacity, is there a way that I can't find that will
allow me
> > to save the Spectrum as a file, instead of saving the amplitude data
> > like the WAV does? or do I have to save WAV and then FFT to get
> > spectrum file myself in Matlab?
> >
> > Thanks, Natalie :)
> >
> >
> >
> >
> > --- In Ed Anson <>
> > wrote:
> > > Tim made some good suggestions. Raven is a high end (i.e.,
> > expensive)
> > > program but it could be what you need. Like Audacity, you can
> > download
> > > it for free, but unlike Audacity all you get is a trial program
> > that is
> > > partially crippled until you pay for it. But (depending on your
> > needs)
> > > Audacity might do the job for free.
> > >
> > > When testing your stereo recording, the most important thing is to
> > be
> > > sure you hear yourself in the right location. That is, be sure the
> > > stereo imaging is correct. It's very easy to get the figure 8 mic
> > > rotated wrong so that the stereo image is reversed or even worse.
> > >
> > > But it's also important that the sound is properly balanced. As Tim
> > > mentioned, the gain range could be an issue. You might also
want to
> > run
> > > the Balance Calibration menu item (#75). This helps make sure that
> > the
> > > 12 o'clock position on the bottom knob really sets the proper
> > balance
> > > between the channels. If it is not balanced properly, you could get
> > > uneven results.
> > >
> > > You might want to consider whether this group might want to hear
> > some
> > > of your recordings. Even though they will be primarily for
> > scientific
> > > research, portions may still have broader appeal. Who knows? Some
> > of us
> > > might even be interested in your research! What are you up to,
> > anyway?
> > >
> > >
> > > On Oct 1, 2005, at 9:33 PM, nbioacoustics wrote:
> > >
> > > > Thanks Ed. Great! I'll try that, thanks Ed. I feel bad because I
> > feel
> > > > like I'm sucking information out of you guys and not giving
any,
> > but
> > > > I'm so new to this that I have nothing to contribute yet...I
> > hope to
> > > > one day!
> > > >
> > > > Another question: when I listen to a recording of myself walking
> > > > around my mics (a cardioid piggbacked on top of a figure 8), I
> > notice
> > > > that my humming is louder when I'm on the sides than when i'm
> > directly
> > > > in front of the mics (even distance in all locations), which
> > makes me
> > > > wonder if there's something unequal about my mics... They are
> > lined up
> > > > with the capsules equal. One is a MKH 30 and the other a 40.
Any
> > idea
> > > > of why this might be?
> > > >
> > > > --- In Ed Anson <>
> > > > wrote:
> > > > > What you want is a spectrograph. There are several products
> > > > available
> > > > > than can provide that for you. They vary widely in quality and
> > > > cost. I
> > > > > would suggest you try two things:
> > > > > 1. Check out Audacity. It is a free downloadable editor that
> > can
> > > > > produce a spectrogram.
> > > > > 2. If that doesn't meet your needs, just Google spectrograph
> > and you
> > > > > will find a number of alternatives.
> > > > >
> > > > >
> > > > > On Oct 1, 2005, at 9:16 PM, nbioacoustics wrote:
> > > > >
> > > > > > So now that I can record from MS to stereo, how can I look
> > at my
> > > > > > 'data' as a graph showing Frequency as a function of Time?
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > "Microphones are not ears,
> > > > > > Loudspeakers are not birds,
> > > > > > A listening room is not nature."
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> > > > > >
> > > > > >
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> > > >
> > > >
> > > >
> > > > SPONSORED LINKS
> > > > Science kits
> > > > Science education
> > > > Science kit for kid
> > > > Natural sound
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> > > >
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> > "Microphones are not ears,
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> > Klas Strandberg
> >
> >
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> >
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