Patent US3700781A successfully refreshed from Google Patents.
US3700781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument
Assignee: Kawai Musical Instruments Manufacturing Co Ltd
•
Filing: 1972-01-03
•
Granted: 1972-10-24
•
Expires: 1992-01-03
Abstract
Abstract Circuit for an electronic musical instrument in which a matrix coupled to a counter is connected through key switches to an OR gate and thence via a common line to a plurality of gate controlled flip flops also controlled by a second matrix which is coupled to the counter. The flip flops control gates which selectively pass audio signals to a speaker; a third matrix resets the flip flops.
Inventors
- 👤 Nobuharu Obayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:31
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/18; G10H1/182
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
An electronic musical instrument comprising a multiplex counter circuit having an output side, first and second matrix circuits coupled to said output side and including output terminals, key switches, a single common output for said key switches, the output terminals of the first matrix circuit being connected through respective of said key switches to said single common output conductor, a pulse selective circuit, said output conductor and respective of the output terminals of the second matrix circuit being connected to said pulse selective circuit, said pulse selective circuit having an output side, a plurality of gate circuits corresponding to the key switches being connected to the output side of the pulse selective circuit so that if any of the key switches is closed the corresponding gate circuit is opened, and a sound source signal generator coupled to said gate circuit to pass a signal therethrough.
Claim 2
Dependent Claim
145 words
An electronic musical instrument comprising a multiplex counter circuit having an output side, first and second matrix circuits coupled to said output side and including output terminals, key switches, a single common output for said key switches, the output terminals of the first matrix circuit being connected through respective of said key switches to said single common output conductor, a pulse selective circuit, said output conductor and respective of the output terminals of the second matrix circuit being connected to said pulse selective circuit, said pulse selective circuit having an output side, a plurality of gate circuits corresponding to the key switches being connected to the output side of the pulse selective circuit so that if any of the key switches is closed the corresponding gate circuit is opened, and a sound source signal generator coupled to said gate circuit to pass a signal therethrough.
Claim 3
Dependent Claim
70 words
An electronic musical instrument as claimed in claim 1, wherein the pulse selective circuit comprises a plurality of flip-flop circuits connected to respective of the gate circuits, and a plurality of AND gates connected to and supplying inputs to the flip-flop circuits, said common output conductor being connected to the said AND gates, the output terminals of the second matrix circuit being connected to the AND gates in corresponding relationship.
Claim 4
Dependent Claim
52 words
An electronic musical instrument as claimed in claim 2 comprising a third matrix circuit connected to the output side of the multiplex counter circuit, and OR gates connecting the third matrix circuit to the flip-flop circuits for resetting the same, said OR gates further connecting the AND gates to the flip-flop circuits.
Claim 5
Dependent Claim
17 words
An electronic musical instrument as claimed in claim 1 comprising a speaker coupled to said gate circuits.
Claim 6
Dependent Claim
21 words
An electronic musical instrument as claimed in claim 1 wherein said multiplex counter circuit includes a multivibrator and two binary circuits.
Claim 7
Dependent Claim
21 words
An electronic musical instrument as claimed in claim 1 comprising an OR gate connecting the switches to said common output connector.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |