There is no rush. I can wait.
Klas.
At 15:10 2003-07-02 -0700, you wrote:
>Klas,
>
>I have a number of data analysis tools that might do it. I can't look at t=
he
>problem until next week though. Just too doggone busy for the next few day=
s!
>After that be glad to help sort it out, if somebody else hasn't already
>figured out how to do it, or what you need.
>
>Greg Clark
>
>At 12:28 PM 7/2/2003 +0200, wrote:
>>all,
>>
>>I have always measured the frequency response of a parabolic set up at a
>>distance of 30 meters, outside. A loudspeaker has been fed with a sine wa=
ve
>>sweep, controlled by a reference mic. The parabol has been 30 meters away
>>from the loudspeaker, feeding an HP analog printer drawing "Y" =3D output=
and
>>"X" =3D frequency, as usual.
>>
>>But to get a good printer resolution, I have to make the sweeps at least =
30
>>seconds. The problem is then that I easily blow out the loudspeakers. The
>>loudpeaker winding gets hot and piezo horns don't work well.
>>
>>Now I have though of doing this in another way: My sweep generator can sw=
eep
>>20Hz -20kHz in 1 sec, shortest time. Any good loudspeaker can handle one
>>sec, even with a lot of effect. The winding never gets hot.
>>
>>I can record the sweep on the DAT and feed it into my PC.
>>
>>But I need a software to convert the recording into a common XY logaritmi=
c
>>diagram. Wavelab has a 3D frequency analysis and I can choose different
>>options to view it, but noone is as simple as I want it.
>>
>>Ideas?
>>
>>Klas.
>>Telinga Microphones, Botarbo,
>>S-748 96 Tobo, Sweden.
>>Phone & fax int + 295 310 01
>>email:
>>
>>
>>
>>
>>To unsubscribe from this group, send an email to:
>>
>>
>>
>>
>>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/=
>>
>>
>>
>>
>Visit http://mirror-pole.com for Arizona bird photographs and sound record=
ings.
>
>
>
>To unsubscribe from this group, send an email to:
>
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/=
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
________________________________________________________________________
________________________________________________________________________
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
|