Raimund Specht wrote:
> Walt wrote:
>
>>Several years of using the Telinga has given me a very good
>>working knowledge for what it can and can't do. At least as far as
>
> the
>
>>frequency range of frogs we have (200hz - 7500hz) I'm extremely
>
> familiar
>
>>with those.
>
>
> I agree. A parabola is still very useful for recording distant
> sounds (especially in situations where it is impossible to get
> closer to the subject). You simply have to live with it's
> limitations (but you should know them). The alternative of using a
> bare microphone (even a shotgun) might be worse, because the sound
> you are interested in will be buried in the inherent noise of the
> microphone.
I do know the limitations. I know pretty much what sort of reach I have.
That's way farther at the low frequencies than the official theory
predicts. Just as the wild gyrations in gain theory predicts are also
not evident and should be in many of the frogcalls. Why, we could
agonize over for a very long time, I more take it as it comes. It's a
tool I know very well how to use.
In the survey work, probably 90% of my stuff could not be done with any
bare mic, or done extremely poorly. This is a combination of it's reach
ability and it's selective ability. I do take advantage of times I can
get close enough for the other mics, as I did with the recent samples I
put up. And note how poor the Telinga sounds next to them in the
Spadefoot Toad recordings. Not because of frequency concerns, I'm just
so close it only gets a small slice out of the middle of the chorus. And
as Klas noted none of the reflected sound off the surroundings. Maybe
much better for science, but not for listening. Each setup has it's
uses, best determined by going out and trying it with a open mind.
Sometimes theory is pretty predictive, sometimes not.
I often deliberately ignore established theory. Some such experiments
work and improve my recording ability, some don't. That's one of the
ways to expand our abilities.
I've been working with parabolic mics since the 50's, though that one
was to pick up the return from my pulsed sonar. I have some new designs
I'm working on now. Some of which definitely would not be kosher. I
don't think I've yet found all the abilities of this system.
Walt
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