US3752898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument
Assignee: Kawai Musical Instruments Manufacturing Co Ltd
•
Filing: 1972-04-04
•
Granted: 1973-08-14
•
Expires: 1992-04-04
Abstract
Abstract An electronic musical instrument having a simplified circuit arrangement intermediate the instrument key circuit and a control signal circuit, and including a pair of matrix circuits for connection through an array of switching and gate means of a speaker and amplifier.
Inventors
- 👤 N Obayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:45
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/18; G10H1/182
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
A circuit for an electronic musical instrument comprising a multiplex counter circuit, first and second matrix circuits, a plurality of conductors interconnecting said matrix circuits, said second matrix circuit being connected to the output side of said multiplex counter circuit, said two matrix circuits having plural output terminals issuing pulse signals in a successively delayed relationship, changeover switches each having a normally closed contact and a normally open contact being connected to the output terminals of said first matrix circuit, said normally closed contacts and said normally open contacts being connected to respective common conductors, a pulse selective circuit connected to said common conductors and to the output terminals of said second matrix circuit, and plural gate circuits connected to the output side of the selective circuits whereby, upon closing of the normally open contact of any predetermined one of the changeover switches, the corresponding one of said plural gate circuits connected to the output side of the selective circuit is opened to allow a signal to pass therethrough, and upon closing of the normally closed contact, said gate circuit is closed so as to prevent the signal from passing therethrough.
Claim 2
Dependent Claim
191 words
A circuit for an electronic musical instrument comprising a multiplex counter circuit, first and second matrix circuits, a plurality of conductors interconnecting said matrix circuits, said second matrix circuit being connected to the output side of said multiplex counter circuit, said two matrix circuits having plural output terminals issuing pulse signals in a successively delayed relationship, changeover switches each having a normally closed contact and a normally open contact being connected to the output terminals of said first matrix circuit, said normally closed contacts and said normally open contacts being connected to respective common conductors, a pulse selective circuit connected to said common conductors and to the output terminals of said second matrix circuit, and plural gate circuits connected to the output side of the selective circuits whereby, upon closing of the normally open contact of any predetermined one of the changeover switches, the corresponding one of said plural gate circuits connected to the output side of the selective circuit is opened to allow a signal to pass therethrough, and upon closing of the normally closed contact, said gate circuit is closed so as to prevent the signal from passing therethrough.
Claim 3
Dependent Claim
188 words
A circuit for an electronic musical instrument comprising a multiplex counter circuit, first and second matrix circuits, a plurality of conductors interconnecting said matrix circuits, said second matrix circuit being connected to the output side of said multiplex counter circuit, said first and second matrix circuits having a plurality of output terminals, the output terminals of said first matrix circuit being connected through a plurality of respective switches to a single common conductor, said conductor having a second conductor diverging therefrom, a NOT circuit interposed in said second conductor, a pulse selective circuit connected to the output terminals of said second matrix, and a pluralIty of gate circuits corresponding in number to said plurality of switches being provided on the output said (gate) selective circuit (circuits) being connected to said NOT circuit by said second conductor and to said plurality of switches by said common conductor whereby, upon closing of any predetermined one of said switches, a corresponding gate circuit is opened to allow a signal to pass therethrough, and wherein opening of the switch closes the gate circuit so as to prevent the signal from passing therethrough.
Claim 4
Dependent Claim
188 words
A circuit for an electronic musical instrument comprising a multiplex counter circuit, first and second matrix circuits, a plurality of conductors interconnecting said matrix circuits, said second matrix circuit being connected to the output side of said multiplex counter circuit, said first and second matrix circuits having a plurality of output terminals, the output terminals of said first matrix circuit being connected through a plurality of respective switches to a single common conductor, said conductor having a second conductor diverging therefrom, a NOT circuit interposed in said second conductor, a pulse selective circuit connected to the output terminals of said second matrix, and a pluralIty of gate circuits corresponding in number to said plurality of switches being provided on the output said (gate) selective circuit (circuits) being connected to said NOT circuit by said second conductor and to said plurality of switches by said common conductor whereby, upon closing of any predetermined one of said switches, a corresponding gate circuit is opened to allow a signal to pass therethrough, and wherein opening of the switch closes the gate circuit so as to prevent the signal from passing therethrough.
Claim 5
Dependent Claim
54 words
A circuit as claimed in claim 1, wherein said pulse selective circuit comprises plural flip-flop circuits connected to the input terminals of the plural gate circuits, plural AND gates connected to input terminals for setting of the flip-flop circuits, and plural AND gates connected to input terminals for resetting of the plural flip-flop circuits.
Claim 6
Dependent Claim
54 words
A circuit as claimed in claim 2, wherein said pulse selective circuit comprises plural flip-flop circuits connected to the input terminals of the plural gate circuits, plural AND gates connected to input terminals for setting of the flip-flop circuits, and plural AND gates connected to input terminals for resetting of the plural flip-flop circuits.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |