US3794747A - Electronic musical instrument - Google Patents

Electronic musical instrument Download PDF

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Publication number
US3794747A
US3794747A US00251796A US3794747DA US3794747A US 3794747 A US3794747 A US 3794747A US 00251796 A US00251796 A US 00251796A US 3794747D A US3794747D A US 3794747DA US 3794747 A US3794747 A US 3794747A
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Prior art keywords
circuit
matrix
conductor
circuits
output terminals
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Expired - Lifetime
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US00251796A
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English (en)
Inventor
N Obayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawai Musical Instruments Manufacturing Co Ltd
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Kawai Musical Instruments Manufacturing Co Ltd
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/18—Selecting circuits
    • G10H1/182—Key multiplexing

Definitions

  • a multiplex counter circuit is provided at its output side with a preset circuit comprising, for example, an AND matrix circuit, a reset circuit comprising, for example, an OR matrix circuit and a key or tablet switch circuit comprising, for example, an AND matrix circuit, the output terminals of these circuits being connected to a pulse selective circuit comprising, for example, a combination of an AND circuit, an OR circuit and other related circuits a plurality of gate circuits being provided on the output side of the pulse selective circuit, so that by closing any of the key or tablet switches, a corresponding one of the gate circuits is opened for allowing a sound signal to pass therethrough and, by means of a pulse signalfrom the aforementioned reset circuit caused by opening of said switch, the gate circuit is closed for preventing the sound signal from passing therethrough.
  • a preset circuit comprising, for example, an AND matrix circuit
  • a reset circuit comprising, for example, an OR matrix circuit
  • a key or tablet switch circuit comprising, for example, an AND matrix circuit
  • An object of the present invention is to simplify the wiring of the key or tablet switch relation circuit in the above-described kind of electronic musical instrument.
  • the output terminals of the first matrix circuit are con-- nected to a single common output terminal through a key switch or tablet switch or other like switch circuit.
  • This common output terminal and the output terminals of the second matrix circuit are connected to a pulse selective circuit, and there are provided on the output side thereof a plurality of gate circuits corresponding to the key switch or tablet switch and interposed in a circuit connected between the output terminals of a sound source oscillator and a speaker through an amplifier.
  • FIG. 1 shows an embodiment in which the invention is applied to a key circuit.
  • sections 1 and 2 are first and second multiplex counter circuits driven by an oscillator 3.
  • Circuits -1 and 2 respectively comprise three binary circuits 1a, 1b and 1c and 2a, 2b and 20. It is arranged that the pulse signals shown in FIG.
  • Gate circuits 15-1 15-7 are connected to the output terminals of the flip-flop circuits FF, FF Upon opening of any of the gate circuits 15-1 [5-7, a sound signal generated by a sound source signal oscillator 18 is allowed to pass and is sent to a speaker 17 through an'amplifier l6.
  • a pulse signal which is the eighth output of the serves as a reset signal for synchronizing the first and second multiplex; counter circuits when they are not synchronized as may occur expecially when the electric source is put on.
  • Elements 23 are electric source terminals for the first multiplex counter circuit 1 and the first matrix circuit 4. If the first multiplex counter circuit 1 and the first' matrix circuit 4 are provided in a music organ body and the remaining sections are separately provided, the organ body section and the remaining sections are interconnected by only five conductors. These include a conductor 24 connected between the oscillator 3 and the first multiplex counter circuit 1, the conductor 21 for the resetting signal, the conductor 9 connecting the output sides of the key switches 8-1 8-7 in common, and the conductors 23 for the voltage source.
  • the frequency generated in the oscillator 3 may be enough if above 500 Hz.
  • the sound source signal oscillator 18 (8186 Hz) including a frequency divider circuit can be utilized.
  • FIG. 4 shows an embodiment in which the invention is applied to a tone forming circuit.
  • The-first and second multiplex counter circuits 1 and 2 of FIG. 1 or other first and second multiplex counter circuits (not shown) are provided at their output terminals A A,, B E, and A A ⁇ , B fi with first and second matrix circuits 25 and 26 connected thereto.
  • Output terminals 25-1 25-3 of the first matrix circuit 25 are provided with tone selective switches 27-1 27-3, instead of the key switches in FIG. 1.
  • a branches conductor 28 connects the switches in common and a conductor 30 branches therefrom through a NOT circuit 29.
  • Output terminals 26-1 26-3 of the second matrix circuit 26 are connected to a pulse selective circuit 32.
  • Gate circuits 33-1 33-3 corresponding to the tone selective switches 27-1 27-3 are provided on the output side thereof. These gate circuits 33-1 33-3 and tone thereto are interposed in thev circuit connecting the sound source signal oscillator 18 and the speaker 17 through the gate circuits 15 15-7 and the amplifier 16.
  • the first and second multiplex counter circuits connected to the input sides of the first and second matrix circuits 25 and 26, respectively, are arranged to be operated synchronously in the same manner as in the case of FIG. 1, so that synchronized pulse signals are generated in successively delayed relationsip at the output terminals 25-1 25-3 and 26-1 26-3 of the first and second matrix circuits 25 and 26. If any of the tone selective switches 27-1 27-3' is closed, in almost the same manner as in the case of FIG.
  • the corresponding one of the gate circuits 33-1 33-3 is opened and a sound signal passed through any of the key switches 8-1 8-7 is allowed to pass forming circuits 34-1 34-3 connected in series through the opened one of the gate circuits 33-1 33-2 and the corresponding one of the tone forming circuits 34-1 34-3, whereby the signal is formed into a desired tone wave form.
  • a sound having a desired quality of tone is heard from the speaker 17.
  • FIG. 1 shows the case where the conductor 11 is branched from the conductor 9 through the NOT circuit 10, so that there may be obtained a signal for closing of the gate circuits 15-1' 15-7, that is by thegeneration of a reset signal.
  • An instrument'as claimed in claim 1 comprising an OR gate connecting the switches to said common conductor andvia the common conductor to said pulse selective circuit.
  • An instrument as claimed in claim 1 comprising a third matrix associated with the second matrix and coupled to the pulse selective circuit to reset the latter.
  • said pulse selective circuit including flip flops including set and reset terminals and wherein said instrument further comprises a third matrix associated with the second lective circuit includes flip flops including set and reset terminals and wherein said instrument further comprises a NOT circuit connected between the said conmatrix and coupled to said counter circuits and coupled to the reset terminals of the flip flops of the pulse selective circuit to reset said flip flops.
  • An electronic musical instrument comprising an oscillator, first and second multiplex counter circuits synchronously driven in common by said oscillator, first and second matrix circuits coupled respectively to said counter circuits for producing respective sequences of pulses, first and second common conductors, said matrix circuits including a plurality of output terminals, switches connecting the output terminals of said first matrix circuit to said conductors for selectively transferring signals from said first matrix circuit to said conductors, a pulse selective circuit coupled to said conductors and to the output terminals of said second matrix circuit, sound means, a speaker and gating means coupled between said sound means and speaker and being coupled to and controlled by said pulse selective circuit, said pulse selective circuit responding to signals on said conductors and from said second matrix circuit to control said gating means, said pulse selective circuit including flip flops including set and reset terminals and said switches including first output terminals connected to said first conductor, second output terminals, and switch blades selectively connecting said first or second output terminals to said first matrix circuit, said second conductor being connected between said second output terminals

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
US00251796A 1971-05-11 1972-05-09 Electronic musical instrument Expired - Lifetime US3794747A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46030858A JPS5117414B1 (enrdf_load_stackoverflow) 1971-05-11 1971-05-11

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US3794747A true US3794747A (en) 1974-02-26

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US00251796A Expired - Lifetime US3794747A (en) 1971-05-11 1972-05-09 Electronic musical instrument

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JP (1) JPS5117414B1 (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899951A (en) * 1973-08-09 1975-08-19 Nippon Musical Instruments Mfg Key switch scanning and encoding system
DE2636281A1 (de) * 1975-08-15 1977-02-24 Nippon Musical Instruments Mfg Einrichtung zur identifizierung eines betaetigten tastenschalters von zahlreichen tastenschaltern
US4022098A (en) * 1975-10-06 1977-05-10 Ralph Deutsch Keyboard switch detect and assignor
EP0011921A1 (en) * 1978-11-22 1980-06-11 The Wurlitzer Company Large scale integrated circuit generator chip for electronic organ
US4513365A (en) * 1982-02-11 1985-04-23 Reinhard Franz Function selector
US20160225360A1 (en) * 2015-02-04 2016-08-04 Yamaha Corporation Keyboard unit
US9613607B2 (en) 2015-02-04 2017-04-04 Yamaha Corporation Keyboard unit
US9697816B2 (en) 2015-02-04 2017-07-04 Yamaha Corporation Keyboard unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51128455U (enrdf_load_stackoverflow) * 1975-04-12 1976-10-16

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610799A (en) * 1969-10-30 1971-10-05 North American Rockwell Multiplexing system for selection of notes and voices in an electronic musical instrument
US3617602A (en) * 1970-05-25 1971-11-02 Chicago Musical Instr Co Musical instrument having automatic arpeggio circuitry
US3696301A (en) * 1969-10-08 1972-10-03 Nippon Musical Instruments Mfg Tuning indicating apparatus for fm receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696301A (en) * 1969-10-08 1972-10-03 Nippon Musical Instruments Mfg Tuning indicating apparatus for fm receiver
US3610799A (en) * 1969-10-30 1971-10-05 North American Rockwell Multiplexing system for selection of notes and voices in an electronic musical instrument
US3617602A (en) * 1970-05-25 1971-11-02 Chicago Musical Instr Co Musical instrument having automatic arpeggio circuitry

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899951A (en) * 1973-08-09 1975-08-19 Nippon Musical Instruments Mfg Key switch scanning and encoding system
DE2636281A1 (de) * 1975-08-15 1977-02-24 Nippon Musical Instruments Mfg Einrichtung zur identifizierung eines betaetigten tastenschalters von zahlreichen tastenschaltern
US4022098A (en) * 1975-10-06 1977-05-10 Ralph Deutsch Keyboard switch detect and assignor
EP0011921A1 (en) * 1978-11-22 1980-06-11 The Wurlitzer Company Large scale integrated circuit generator chip for electronic organ
US4513365A (en) * 1982-02-11 1985-04-23 Reinhard Franz Function selector
US20160225360A1 (en) * 2015-02-04 2016-08-04 Yamaha Corporation Keyboard unit
US9613608B2 (en) * 2015-02-04 2017-04-04 Yamaha Corporation Keyboard unit
US9613607B2 (en) 2015-02-04 2017-04-04 Yamaha Corporation Keyboard unit
US9697816B2 (en) 2015-02-04 2017-07-04 Yamaha Corporation Keyboard unit

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Publication number Publication date
JPS5117414B1 (enrdf_load_stackoverflow) 1976-06-02

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