Music – Instruments – Electrical musical tone generation
Patent
1990-06-14
1993-04-06
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84726, 84DIG10, G10H 318
Patent
active
052005690
ABSTRACT:
A pickup system for providing sounds for a musical instrument has a feedback circuit for converting a pickup signal representing a vibration of a string or other vibratory element to a drive signal. The pickup system includes a pickup coil, an electromagnetic source which generates a magnetic flux, a device such as a ferromagnetic element for magnetically linking the electromagnetic source and the pick up coil with the vibratory element, a step-up transformer having a primary coil section and secondary coil section, a connection between the pickup coil and the primary coil section of the step-up transformer, an output terminal and circuit elements for connecting the output terminal to the secondary coil section of the step-up transformer. Preferably, the pickup system includes a sustainer having a sustain feedback circuit for accepting a feedback signal which represents the motion of the vibratory element wherein the sustain feedback circuit includes an operational amplifier, a first and a second network and a switch for selectively directing the feedback signal through one of the networks to one of two input terminals of the operational amplifier. In another preferred embodiment, a sustainer for a musical instrument includes a switchable sustain circuit having an inverting and non-inverting signal path which have different frequency response characteristics.
REFERENCES:
patent: 4408513 (1983-10-01), Clevinger
patent: 4484508 (1984-11-01), Nourney
patent: 4499809 (1985-02-01), Clevinger
patent: 5070759 (1991-12-01), Hoover et al.
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