This makes me remember that there are multiple infrasound arrays in
this world watching for those who want to say (from an old
movie) "Let's play global thermal nuclear war". We have made it to a
point where we truely fear what many of us already know is easy to
learn by an 16 year old.
Rich Peet
--- In Wild Sanctuary <>
wrote:
> >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.
>
>
> Alternatively, you could do what the US Army did when testing
> infrasound to kill off living creatures (aka humans) in the jungles
> of Viet Nam in the late 60s. They took a large piece of plastic,
> hooked it up to a very large and powerful driver and pulsed it back
> and forth at about 7.5Hz. at outrageous amplitudes (about 120dBA,
if
> you can imagine). Within about 45 seconds, most living organisms
w/in
> a 3km radius got either very sick or very dead. There was a paper
> (now classified) titled Audiogenic Siezure in Rats written about
1968
> the set the stage for this stuff. Problem was, that the operators
got
> sick, too. The researchers figured that 7.5Hz was a freq that could
> cause siezure because of phase cancellation in the metabolic rate
of
> some cell or nerve structures. So our ever-generous govmint shelved
> that one. You could resurrect it if lo freq is intriuging and test
> the gear that way. I tried it once in my analog synth days.
Everyone
> in the studio got way sick. But we sure as hell got infrasound.
>
> Bernie
>
>
>
> >
> >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
> >
> >
> >
> >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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