I use a 32" Greg Clark Parabolic. Not in commercial production.
http://home.comcast.net/~richpeet/rich.jpg
I am starting to think that not all people do hear the same way. It
is true that I was blessed with good very high hearing. As a kid I=20
played games with other kids at night where I would tell them where a
bat was going to be comming from because I could hear their echo
location calls at a distance. Where most people do feel that the
Telinga makes a complex sound, sound closer, to me it does not, and
simply makes the sound shrill.
But in Sten's paper there should not be a warmer more amplified low
with a larger dish. It should sound just as shrill. I will look to
see if I saved some white noise comparisons between the Telinga and
the Greg Clark that I took at 100 feet in an outside setting. During
that test I made it a point not to care about "lab" conditions but
just pointed and did sweeps with both dishes at a van with the hatch
up and played white noise on the tape deck using the stock pathetic
speaker system.
Rich
--- In Lang Elliott <>
wrote:
> Rich:
>
> I'd like to hear more about the Telinga being more "shrill". What
do you
> mean by that? Also, what large parabola are you using? A Roche?
>
> Is it possible that the larger parabola is simply adding more
amplified low
> frequencies, resulting in a somewhat warmer overall signal? Or are
you
> saying that any particular high frequency signal sounds different
when
> recorded with the smaller Telinga? A test of this would be to
record some
> standard signal with both parabolas, then use a steep high pass on
both
> recordings, but set the high pass below the frequency of the signal
being
> analysed. Then see if the two recordings sound more or less the
same.
>
> Or am I missing the point?
>
> Lang
>
________________________________________________________________________
________________________________________________________________________
>From Tue Mar 8 18:27:03 2005
Message: 4
Date: Wed, 25 Feb 2004 17:30:19 -0000
From: "Rich Peet" <>
Subject: Re: the nature of parabolic reflectors
It does not appear I archived the tests I did with a telinga.
The attached test is a MD so you all can say it is artifacts.=20
I will repeat the test at 24/48 when my preamp comes back from
warrenty replacement as Rob kicked me about. It really was just a
defect and not how I powered the pre. The quadmic really does have a
nice industrial power supply. At input it accepts 6 to 40 volts
ac/dc either polarity. With the brick attached it can be pluged into
any wall outlet in the world. Clean 4 channel through 196khz and
consumes about 5 watts.
For those that want to play with real time frequency graphs.
This is my 32" with a ME-62 at 100 feet pointed at pink noise played
in the van. Yes there were other objects in the area that could
reflect sound. The scan is uneven as I searched for the hotest spot.
1.5 meg download
http://home.comcast.net/~richpeet/32test.wav
Rich
________________________________________________________________________
________________________________________________________________________
|
