Natural Science Forum / Physics / Acoustics / May 2005

I was looking at the diagram of a transducer where a piezo-ceramic disk
is attached to a plastic concave lens;
http://www.qmi-inc.com/AIRSCAN%20TRANSDUCERS,%20TECHNIQUE%20AND%20APPLIC
ATIONS.htm

I am trying to locate recommended IIC ratings (or equivalent) in
buildings for various situations used around the world.
Uniform Building Code (UBC) requires a minimum IIC rating of 45. BOCA
requires a minimum IIC of 50. ANSI SI S12.60-2000 "Acoustical

Hi all,  I need help,I have a neighbour that runs a very loud truck in
the early hours of the morning,he ignores all pleas to desist and the
local authorities cannot or will not help.How can I pick up his noise
and throw it back magnified somewhat.I need to control the direction of

Hi. everyone
I want to use rubber for vibration isolation.
Someone ask me to calculate cut off frequency.
But what does cut off frequency means for rubber ?

I have finally finished an update to my Porous Absorber spreadsheet.  It
 now contains an extra sheet called "Microperforated Panel" in which
the absorption curve of a micro-perforated panel is calculated.  Please
discard any and all previous versions you may have.

This is to do with relative phase of pressure/ velocity.
Why does the phase change anyway?
yours
Richard Pickworth

I have the need to test an impulse response of an acoustical device
which I want to accomplish
a) under unix, favorably linux,
b) with the technique of maximum length sequences, and