Music – Instruments – Electrical musical tone generation
Patent
1992-01-17
1993-08-17
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84633, 84645, G01H 146
Patent
active
052371255
ABSTRACT:
A method and apparatus for sensing the velocity of key motion in a keyboard operated musical instrument, in which sensors (10) have a polymer piezoelectric film (18) laminated to a mylar backing material (20) are mounted in proximity to the keys (12) of a keyboard operated musical instrument. When deflected by the keys (12), the sensors (10) produce analog circuit output voltages proportional to the velocity of key motion. The analog signals are then converted to digital signals and processed by a digital microprocessor (36) to represent the velocity factor component of musical information in Musical Instrument Digital Interface (MIDI) or other digital formats. The digital data is then presented directly to a reproducing musical instrument or recorded on an electronic storage media.
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2 page undated brochure by Pennwalt Corporation, Pennsylvania, entitled "Notable Design with Kynar Piezo Film" identified as publication number A-010785.
7 page undated brochure by Pennwalt Corporation, Pennsylvania, identified as publication number TR-10-M-6-84-PF 101.
Lee, C. K. and Moon, F. C., Laminated Piezopolymer Plates for Torsion and Bending Sensors and Actuators, published in the Journal of the Acoustical Society of America, Jun. 1989.
Lee, C. K., Theroy of Laminated Piezoelectric Plates for the Design of Distributed Sensors/Actuators. Part I: Governing Equations and Reciprocal Relationships, published in the Journal of the Acoustical Society of America, Mar. 1990.
Burgett, Inc.
Kim H.
O'Banion John P.
Witkowski Stanley J.
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