Petillo Guitars • Articles


	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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