Natural Science Forum / Physics / Acoustics / April 2007

Can anyone point out what type of bandpass filters are used for sound
level analysis? I am would like to calculate the broadband parameters
(Leq, Lmax...) in LabView and want to filter the signal so it
corresponds to sound level meter readings (I found on one

What type(s) of noise best simulates car/ road /babble /street /
wind /
rairoad train types of noise. I'm testing mobile systems performance
in typical busy loud enviorments. I need to use the ambient noise

I just watched : http://www.youtube.com/watch?v=hTllhNqi7YU&NR=1. I
wonder if you have some thoughts on how the speaker works. It look
like that the frequencies radiated are not very low to be focused, in
fact it sounds like 500Hz and up. Any ideas/topics to be pinpoint-ed

Would anyone be kind to explain how to compute measurement uncertainty
for sound calibrators?
Particularly, I am interested in distortion and frequency uncertainty
and expanded uncertainty.

Dear friends:
i'm looking for systems and ideas for start a way to get noise level
from two or more points and see it on screen instantaneosly. I will
appreciatte any info.

What are the frequency range used by small electronic that usually
sold in store to annoy rat/mouse?
Hadi

What is the highest-frequency of ultrasound that can propagate through
air on earth's atmosphere?
Thanks,
Radium

Cross posted to groups frequented by
"eskwired_at_spamblock_dot_panix_dot_com"
On Mar 31, 3:41 pm, Salmon Egg <salmonegg_at_sbcglobal_dot_net> wrote
in http://groups.google.com/group/alt.sci.physics.acoustics/msg/1d574b7ffca38bf8?hl=en&