Thanks Jim!
Let me contribute. This was written in... 1991?
http://www.telinga.com/attach.htm
Klas
At 21:20 2011-05-22, you wrote:
>As most of us know sound amplitude and frequency are attenuated as the
>distance to the sound source increases.
>
>
>This effect heard from recordings made of various sounds at different
>distances are often noticeable but difficult to clearly hear.
>
>
>Also recordings made with parabolas amplify the higher frequencies more than
>the low frequencies thereby making the recorded sound seem closer than it
>actually is.
>
>
>The following test of sound vs. distance is an example of sound amplitude
>and frequency attenuation.
>
>
>Here is a description of the test which is the recorded sound of a kitchen
>timer bell at 15, 30, 60, 90, 150, 300 feet. Note the significant
>attenuation of the higher frequencies that increase with distance.
>
>
>Recording at: http://soundcloud.com/fundador/bell-test-15-30-60-90-150-300
>
>
>Recorded with a 23 inch Telinga Twin science parabolic microphone in an open
>field with no obstructions between the bell and microphone.
>
>
>Best regards,
>
>
>Jim Morgan
>
>Prescott, AZ USA
>
>
>
>
>
>------------------------------------
>
>"While a picture is worth a thousand words, a
>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
>
>Yahoo! Groups Links
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
website: www.telinga.com
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