US4430918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument
Assignee: University of Pittsburgh
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Filing: 1982-02-16
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Granted: 1984-02-14
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Expires: 2002-02-16
Abstract
Abstract An electronic stringed instrument which uses electrical resistance wires as strings to control the frequency of electrically generated sounds. By shorting a string at various points along its length a variable voltage output is obtained and converted into a known frequency. A fretted instrument provides a means to incrementally control the voltage output and a non-fretted type instrument with a conducting fingerboard can provide a means to variably control the voltage output. A separate current source may be provided for each string to facilitate chord playing and a control for the intensity and harmonic content of the signals is provided. An internal power supply and speaker may also be employed to make the instrument readily portable.
Inventors
- 👤 Frank Meno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:40
CPC Classifications
G; G10; G10H; G10H5/00; G10H5/002; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/055; G10H1/0558; Y; Y10; Y10S; Y10S84/00; Y10S84/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
An electronic musical instrument comprising a body, a fingerboard attached to said body and having an electrically conducting upper surface, a plurality of spaced parallel resistance wire strings disposed adjacent to said upper surface, means for electrically energizing said strings, means for attaching said strings to said instrument in relative spaced relationship with respect to said conductive surface so that displacing a string to contact said conductive surface completes an electrical circuit having an output voltage associated therewith and displacing said string to contact said surface at differing points along the length of the string varies the resistance in the circuit thereby providing means for variably controlling the output voltage of the circuit, and plucking said string produces a vibrating mechanical tone, and means for converting the output voltage of said circuit into a predetermined frequency.
Claim 2
Dependent Claim
136 words
An electronic musical instrument comprising a body, a fingerboard attached to said body and having an electrically conducting upper surface, a plurality of spaced parallel resistance wire strings disposed adjacent to said upper surface, means for electrically energizing said strings, means for attaching said strings to said instrument in relative spaced relationship with respect to said conductive surface so that displacing a string to contact said conductive surface completes an electrical circuit having an output voltage associated therewith and displacing said string to contact said surface at differing points along the length of the string varies the resistance in the circuit thereby providing means for variably controlling the output voltage of the circuit, and plucking said string produces a vibrating mechanical tone, and means for converting the output voltage of said circuit into a predetermined frequency.
Claim 3
Dependent Claim
150 words
An electronic musical instrument comprising a body, a fingerboard attached to said body having an electrically insulating upper surface and having a plurality of spaced parallel conducting frets attached across said insulating surface at desired points along its length, a plurality of spaced parallel resistance wire strings disposed adjacent to said upper surface, means for electrically charging said strings, means for attaching said strings to said instrument in spaced relationship with respect to said frets so that displacing a string to selectively contact a fret completes an electrical circuit having an output voltage associated therewith and displacing said string to contact differing frets along the length of the string varies the resistance in the circuit thereby providing means for incrementally controlling the output voltage of the circuit, and plucking said string produces a vibrating mechanical tone, and means for converting the output voltage of said circuit into a predetermined frequency.
Claim 4
Dependent Claim
150 words
An electronic musical instrument comprising a body, a fingerboard attached to said body having an electrically insulating upper surface and having a plurality of spaced parallel conducting frets attached across said insulating surface at desired points along its length, a plurality of spaced parallel resistance wire strings disposed adjacent to said upper surface, means for electrically charging said strings, means for attaching said strings to said instrument in spaced relationship with respect to said frets so that displacing a string to selectively contact a fret completes an electrical circuit having an output voltage associated therewith and displacing said string to contact differing frets along the length of the string varies the resistance in the circuit thereby providing means for incrementally controlling the output voltage of the circuit, and plucking said string produces a vibrating mechanical tone, and means for converting the output voltage of said circuit into a predetermined frequency.
Claim 5
Dependent Claim
19 words
An instrument according to claims 1 or 2 wherein each string is operatively associated with an independant electrical circuit.
Claim 6
Dependent Claim
26 words
An instrument according to claims 1 or 2 wherein said musical instrument has means for electrically energizing said strings and a speaker both fixedly secured thereto.
Claim 7
Dependent Claim
18 words
An instrument according to claims 1 or 2 wherein said electrically energizing means provides a constant electrical current.
Claim 8
Dependent Claim
19 words
An instrument according to claims 1 or 2 wherein each string has a resistance value less than 1,000 ohms.
Claim 9
Dependent Claim
18 words
An instrument according to claims 1 or 2 wherein a frequency counter is integrated into said electrical circuit.
Claim 10
Dependent Claim
23 words
An instrument according to claims 1 or 2 including a means for controlling the intensity and harmonic content of the frequency signal produced.
Claim 11
Dependent Claim
31 words
An instrument according to claim 8 wherein said means for controlling intensity and harmonic content is attached to said body so as to allow control thereof by a player's free hand.
References Cited (Backward Citations)
US31019A
Cited
US3624584A
Cited
US3626350A
Cited
US3673304A
Cited
US3902392A
Cited
US3948137A
Cited
US4038897A
Cited
US4085647A
Cited
US4176576A
Cited
US4306480A
Cited
US4179971A
Cited
US4235141A
Cited
USRE31019E
Cited
US4295402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |