Thank you Klas for the additional information. Your paper provides much mor=
e
detailed information and many members would benefit by reading it.
Jim
On Sun, May 22, 2011 at 3:42 PM, Klas Strandberg <> wrote=
:
>
>
> 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 i=
t
> >actually is.
> >
> >
> >The following test of sound vs. distance is an example of sound amplitud=
e
> >and frequency attenuation.
> >
> >
> >Here is a description of the test which is the recorded sound of a kitch=
en
> >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
>
>
>
>
>
|