Natural Science Forum / Physics / Acoustics / October 2003

Dear friends:
I have   a doubt?
If I need to measure vibrations from a plate on a stand person, Must
the person be "on" the transducer, or can I simulate the person with a

I'm interested in any books or references to the mechanical
/ acoustical design aspects of cell phones and other portable
microphone/speaker devices.  I'm looking for a primer on
microphone receiver construction, etc.

I am trying to decide on the type of floor to put in my basement project
studio. Will there be any significant difference in room acoustics between
using ceramic tiles and a wood laminate like Parquet or Pergo?
Martin

The Quantum of heat is the thermon and only the thermon. OKAY. Not the
electron, not the photon, and not the phonon. If you disgree please
check out: http://www.journaloftheoretics.com/Articles/3-4/commentary3-4.htm
Jacob Ghitis states in the Journal of Theoretics:

can someone provide me with information regarding how I can calculate
the radiated farfield acoustic pressure from pressure measurements done
on a rectangular planar microphone array. I know that the
Rayleigh-Sommerfeld integral formula can be used but could not find any

I must built a structure in tubalar steel and sintetic carpets I think
reverber time will be too high
Some suggestion or practical realization about this?
hear ya soom

I did an experiment long ago that increased depth perception of audio by
placing a mic as close as possible in front of each loudspeaker. The
orientation of the mic diaphragm is the same as the speaker driver (facing the
listener). The mics were connected to the left and right ...

The question is about centar frequency in 1/1 Octave, 1/3rd & 1/6th Octave.
Nomenclature:
f(high):=f2
f(low):=f1

I am doing a project. I would like to transfer several watts of
(electrical) energy through a metal wall (about 1 cm thick) and use
the energy to activate an electric device. I could put a coil on one
side of the aluminium wall, feed the coil with AC current, and pick up

       I have a time series of accelerations (acceleration versus time) and
I need to convert it to acceleration versus frequency.  At a glance my first
idea was to take the Fourier transform of the data set which would give
power versus frequency and then use some kind of existing ...

Colleagues etc.
In the UK I am not aware of any precedent that requires introduction
of a noise barrier to any specific location where it is known that a
new road or rail source would increase the noise at that location - it

Can anybody help me regarding sources of noise in torpedo? What are
the existing methods to make them stealth (quieter)? How can we make
submarine activity quieter? Suggestion for available literature will
also help me to understand the physics of torpedo. Any numerical

I am new to the list, and I am writing to kindly ask for any suggestions
you may have on how to implement numerical absorbing boundary conditions
for acoustic wave propagation codes in bounded media.
I need to add a dissipative boundary condition in a two dimensional finite

  I need help from a physicist about hurricanes.
 The present thinking about the steering rotation of hurricanes, was
worked out by a French physicist ,Coriolis in the 19th centaury.
    I find Coriolis to be in error  for several reasons, and would like

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