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Guitar
Guru Frets Over The Details By KARYN D. COLLINS
Appeared in the Asbury Park Press on
1/18/01
(click the link above to be taken to the
article)
Dr. Petillo's Detailed Perspective: The Acoustic Tonal Sensor
The Acoustic Tonal Sensor is a device
to reproduce exact acoustic tones. The term sensor is a device
that responds to physical stimulus (as heat, light, sound, pressure,
magnetism, or a particular motion). By studying different types
of wood technology, we've discovered a method to take advantage
of wood. How? Wood, in general has several things, which are
very interesting to observe such as, wood fibers and pores.
Wood fibers have elongated cell structures with pointed ends
contributing notably to the strength of the wood. The pores
of the wood are the cross section of the wood fibers. Fibers
and pores have elements present such as, parenchyma (thin walled
wood cells); these areas in the wood vibrate when excited such
as when strings vibrate, these cells move in many directions.
Because of this, we see an advantage, which is energy. The device
I invented senses these cell movements and turns them into voltage,
this process is called piezoelectric. The materials used to
make a piezoelectric device are Ethylenediamine Tratrate Crystals
and in combination with Barium Titanate modified with high temperature
stabilizers that are pressed into various shapes, these shapes
allow for frequencies to be made from the vibrations of the
strings moving the wood fibers and pores. When the vibrations
reach the sensor, the vibrations cause the sensor element to
flex.
This flexing makes a voltage and that is seen by the amplifier
as a signal and then an audio sound. We modified this formula
to be selective in what frequencies it will accept and reject.
Some frequencies need to be rejected because they cause the
output sound and tone to be phased distortions with a hollow
metal sound. In contrast to vibrational curves an harmonic resonant
harmony. We hope this helps you understand what our research
has discovered.
For more information on this subject
consult the following books:
1) On The Sensations Of Tones (By: Hermann Helmholtz)
2) Merck Index Twelfth Edition
3) Investigations On The Theory Of The Brownian Movement (By:
Albert Einstein)
4) Van Nostrands Scientific Encyclopedia 5Th Edition (Edited
by: Douglas M. Considine)
5) Music, Physics, And Engineering (By: Harry F. Olson)
6) The Encyclopedia Of Chemistry (By: Clifford A. Hampel)
7) Materials Handbook 11th Edition (By: George S. Bradey, Henry
R. Clauser)
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