Thanks Bernie.
Of course I am disappointed.
I would have liked to have determined that I found a viable recording
package for recording infrasound for under $500.00.
I wish I could find a source of accurate infrasound to use as a check
but all the freq generators I know of don't go there. I guess my
next stop should be the zoo to visit elephants.
Rich Peet
--- In Wild Sanctuary <>
wrote:
> In checking out the ruffed grouse signal, Rich, two things seem to
> happen depending on the software one uses. If I use a HAM weighted
> low pass filter setting, I certainly get a reading (probably
> artifact) from the signal showing it almost down to zero. I doubt
> it's THAT low. The wingbeats generate lots of pulsed air and,
> depending on the habitat and input transducer, there can be
> distortion and other acoustic anomalies introduced. If, on the
other
> hand, I look at the signal with the GWI system, I don't get much if
> any signal below 28.5Hz. That sounds more real to me and I would
tend
> to trust that analysis as being closer to what's actually
happening,
> if indeed, it's that low.
>
> Bernie Krause
>
> >64kb spectral display:
> >http://home.comcast.net/~richpeet/grouse.jpg
> >
> >200 kb wave at:
> >http://home.comcast.net/~richpeet/0298.wav
> >
> >Thanks, I really have these questions because I am not in the audio
> >business and am not an expert. I just do what I do.
> >
> >Rich Peet
> >
> >--- In Wild Sanctuary
<>
> >wrote:
> >> Send a short .wav file, Rich, and I'll check it out, here, on
the
> >GWI
> >> system. Sometimes recordings create an artifact that looks like
a
> >> sub-harmonic but is really a "ghost" signal created by wierd
sums
> >and
> >> differences.
> >>
> >> Bernie Krause
> >>
> >> Wild Sanctuary, Inc.
> >> P. O. Box 536
> >> Glen Ellen, CA 95442
> >> 707-996-6677 tel
> >> 707-996-0280 fax
> >> http://www.wildsanctuary.com
> >>
> >> >They speak of calls of 18 hz. I asked and didn't get a
response on
> >> >if the grouse I recorded with a signature to 1/2 hz was
accurate.
> >> >I have now asked Adobe if the spectral display is correct.
> >> >Maybe they (wcs.org) are speaking of voice calls at 18 hz but
if
> >so I
> >> >don't understand the body mechanics of that. The lowest I have
in
> >> >voice recorded to date is the Great Gray Owl.
> >> >
> >> >Rich Peet
> >> >
> >> >
> >> >--- In Doug Von Gausig
> ><>
> >> >wrote:
> >> >> See http://wcs.org/7411/?art=3D110481374. Some dinosaur folks
are
> >> >thinking
> >> >> that the subsonic calls of the Cassowary may be very
similar and
> >> >> pleisiomorphic to the calls that Dinosaurs used to
> >communicate...
> >> >>
> >> >> Doug
> >> >> Doug Von Gausig
> >> >> Clarkdale, Arizona, USA
> >> >> Moderator
> >> >> Nature Recordists e-mail group
> >> >> http://groups.yahoo.com/group/naturerecordists
> >> >
> >> >
> >> >
> >> >To unsubscribe from this group, send an email to:
> >> >
> >> >
> >> >
> >> >
> >> >Your use of Yahoo! Groups is subject to
> >http://docs.yahoo.com/info/terms/
> >>
> >>
> >> --
> >
> >
> >
> >To unsubscribe from this group, send an email to:
> >
> >
> >
> >
> >Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
>
>
> --
> Wild Sanctuary, Inc.
> P. O. Box 536
> Glen Ellen, CA 95442
> 707-996-6677 tel
> 707-996-0280 fax
> http://www.wildsanctuary.com
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