I don't need "true" measurments, only the data from one measurment compared
to another. Like the difference between a certain omni, in the dish, -
compared to another omni, in the dish.
I need top compare one PZM design in the dish with another. Etc.
I hear what is going on, but it is very nice to also see how that change is
described in terms of a diagram.
The mic beside the loudepeaker, about a meter away, is only a "leveler". It
flattens out some of the irrgularities caused by the loudspeaker.
Like so many others, you seem to miss the point with a parabol. A parabol is
a parabol and it does what it does. It can never be compared with an omni or
a directional mic. It's another tool. Please read the white papers at
telinga.com.
Best wishes,
Klas.
omniAt 21:25 2003-07-04 -0000, you wrote:
>There is something here that I clearly don't understand.
>In that mics are better than speakers and sound decays over distance
>having a omni at 30 meters next to your dish seems to make sense in
>any comparison. The "different things" that a dish sees I understand
>to always be "bad" things. I don't understand when you would want to
>do a comparison without a true reference that an omni would offer.
>
>Rich Peet
>
>
>--- In Klas Strandberg
><> wrote:
>> Yes, then it was relevant to have both mic's at 30 meters, as both
>mic's
>> were omnis.
>> My set up is a little different, I can't compare a parabol at 30
>meters with
>> an omni at the same distance. They will "see" very different things
>and
>> react to very different reflections, in and out of phase.
>>
>> Klas.
>>
>> At 11:18 2003-07-03 -0700, you wrote:
>> >Klas, you wrote,
>> >
>> >>It doesn't matter if my "leveler" don't work perfectly. Please
>note that I
>> >>don't measure true frequency curves, as in a laboratory, but
>rather curves
>> >>only to describe a change from one set up to another. Example:
>What happens
>> >>if I put an omni facing forward, compared to if I put it facing
>inwards the
>> >>dish?
>> >
>> >I understand. I did the same thing with my CVX review, not
>worrying
>> >about absolute calibration but comparing the responses of two
>mikes.
>> >You could use the FFT analyzer then, with pink noise driving the
>> >speaker. I'd put the calibration mike and the mike being tested
>both
>> >at 30 meters, and compare the curves.
>> >
>> >-Dan Dugan
>> >
>> >
>> >To unsubscribe from this group, send an email to:
>> >
>> >
>> >
>> >
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>> >
>> >
>> >
>> Telinga Microphones, Botarbo,
>> S-748 96 Tobo, Sweden.
>> Phone & fax int + 295 310 01
>> email:
>>
>
>
>
>To unsubscribe from this group, send an email to:
>
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>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
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