US3918342A - Monophonic electronic musical instrument of equal tempered scale - Google Patents

Monophonic electronic musical instrument of equal tempered scale Download PDF

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Publication number
US3918342A
US3918342A US504878A US50487874A US3918342A US 3918342 A US3918342 A US 3918342A US 504878 A US504878 A US 504878A US 50487874 A US50487874 A US 50487874A US 3918342 A US3918342 A US 3918342A
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United States
Prior art keywords
resistors
terminals
terminal
keyboard switches
equal tempered
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Expired - Lifetime
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US504878A
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English (en)
Inventor
Fumio Mieda
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Keio Giken Kogyo KK
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Keio Giken Kogyo KK
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/02—Preference networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/08—Keyed oscillators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/20—Monophonic

Definitions

  • a note voltage generator circuit includes a plurality of first resis- [52] 84/101 84/1316 Z g d tors connected in series between first and second ter- [51] lm. c1. 0101! 1/02; @1011 5/02 mmals a Olseconfj each Connected between the connection point of adjacent ones of the [58] Field of Search 84/1.0l, DlG. 2, DIG. 8, 4 I
  • This invention relates to improvements in a monophonic electronic musical instrument of an equal tempered scale which has keyboard switches corresponding to notes of the equal tempered scale, a note voltage generator circuit from which a note voltage corresponding to each of the keyboard switches can be obtained by depressing each of the keyboard switches, an oscillator for producing a tone signal having a frequency corresponding the note voltage, an amplifier foramplifying the tone signal and a speaker connected to the amplifier.
  • the note voltage generator circuit heretofore employed in this kind of monophonic electronic musical instruments is constructed to include a variable resistor for each of the resistance circuits corresponding to the notes, and hence is complicated, bulky and expensive in its overall circuit construction and, in addition, involves troublesome adjustment of the resistance values of the individual resistance circuits corresponding to the notes.
  • the present invention has for its object to provide a monophonic electronic musical instrument which is free from the aforesaid defects experienced in the prior art.
  • FIG. 1 is a block diagram showing one example of a monophonic electronic musical instrument of the equal tempered scale according to this invention
  • FIG. 2 is a graph showing the relationships of voltages and frequencies of signals corresponding to notes to selection switches, for explaining this invention.
  • FIGS. 3 and 4 are block diagrams illustrating other examples of this invention, respectively.
  • reference numeral 1 indicates generally a note voltage generator circuit according to this invention. Between terminals 2 and 3 are sequentially connected in series (n-l) s resistors X X and X,,., where n indicates the last term or the number of terms in a series of similar terms. Resistors Y Y and Y,,
  • resistors X, to X have the same resistance value r and the resistors Y to Y have also the same resistance value R.
  • the voltages e e and e are sequentially obtained between the output terminals 8,, and 8,, and supplied to an oscillator 9, from which are sequentially derived tone signals F F and F, having frequencies f,, f and f,, respectively.
  • the oscillator 9 is one that its input voltage versus frequency characteristic is linear, so'that; the frequencies f,, f;, and f,, of the tone signals F F and F,, derived from the oscillator 9 bear the following relationships:
  • the tone signals of the frequencies f f and f,,, sequentially derived from the oscillator 9 by sequential depression of the switches S S and 8,, are supplied through an amplifier 10 to a speaker 11. Accordingly, if the switches S S and S,, are selectively depressed one after another, notes of the frequencies f,, f and f are sequentially produced from the speaker 11.
  • the frequencies f to f bear the relationships given by the equation (2), so that, by sequentially depressing the switches S S and 8,, the equal tempered scale having a constant diminishing ratio between adjacent notes respectively can be obtained.
  • FIGS. 3 and 4 show the relationships of the voltages e e and e supplied to the oscillator 9 and the frequencies f f and f of the tone signals from the oscillator 9 to the switches S S and S
  • the solid line indicates the abovedescribed case.
  • the dash line and the chain line illustrate the corresponding relations when the X resistor of each section of the attenuator is subdivided as shown in FIGS. 3 and 4.
  • theequal tempered scale having a constant diminishing ratio between adjacent notes can be obtained, so that the keyboard switches S to S,, are arranged from the higher part of notes toward the lower part of notes.
  • the resistance values r, R and R of the resistors X to X,, Y to Y,, and and 6 in the case of K of the aforesaid equation l being 11 bear the following relationships:
  • the values of the aforementioned resistors X to X,, Y to Y,, and 5 and 6 are so selected as to satisfy the equations (4) and (5).
  • each resistance circuit need not be constructed to include a variable attenuator.
  • this invention the case of depressing the switches S S S has a great advantage that the ordinary equal tempered scalecan be moderately obtained without adjusting the resistance value of eachresistance circuit corresponding to each note.
  • connection points P P P and P1 of the terminal 2 and the resistor X the resistors X and X the resistors X and X the resistors X,, and X,, and the resistor X and the teminal 3 are connected to the power source 7 through the keyboard switches S S S and S respectively. Further, points P P P and P, led out from the mid points dividing the resistors X X and X,, into two respectively, are connected to the power source 7 through the keyboard switches S S S and 5 respectively.
  • FIG. 3 illustrates such a modified 'form of the note voltage generator circuit 1 in which the connection points P P P P,, and P of the terminal 2 and the resistor X the resistors X and X X and X X,, and X,, and the resistor X,, and the terminal 3 are connected to the power source 7 through the keyboard switches, respectively, and, in addition, the points P P and P,, led out from the dividing points of the resistors X to X, are also connected to the power source 7 through the keyboard switches, respectively.
  • FIG. 4 shows another modified form of this invention which is constructed in view of the above and inwhich' two points dividing each of the resistors X, to X,, of
  • the note voltage generator circuit 1 into three are con- S nected to the power source 7 through the keyboard swithces.
  • parts corresponding to those in FIG. 1 are identified by the same reference numerals and characters and no detailed description will be repeated.
  • the values r, R and R of the resistors X to X,, Y to Y,, and and 6 are so selected as to satisfy the following conditions corresponding to the aforesaid equations (4) and (5):
  • connection points P P P P,, and? of the terminal 2 and theresistor X,, the resistors X, and X X and X X,, and X,, and the resistor X and the terminal 3 are connected to the power source 7 through the keyboard switches S S S and S Further, points P and p P and p P,, and P,, led out from two points dividing each of the resistors X to X,, are connected to the power source 7 through the keyboard switches S and S S and S 3n-4 and 3(n-l)- With such an arrangement, since the conditions of the equations (l0)'and (11) are satisfied, when the switches 5 S S are sequentially depressed, the voltages derived between the output terminals 8,, and 8,, are the same as the voltages e e e obtained in the case of the example of FIG.
  • the chain line indicates the relationships of thevoltages e e e e e e5", e e plied tothe oscillator 9 to the switches-8 ,5 and ",1 ⁇ , of the signals derived from the oscillator 9 to the switches S S in this case.
  • f ",f f indicate the oscillation frequencies ;of the voltages switches S S S in the case of FIG. 1, are ob- I tained. Further, in the case of sequentially depressing Although the foregoing description has been given in connection with the case.
  • a monophonic electronic musical instrument of an equal tempered scale comprising keyboard switches corresponding to notes of said equal tempered scale, a note voltage generator circuit for producing a note voltage corresponding to each of said keyboard switches in response to the depression of each of the keyboard switches, an oscillator for producing a tone signals having a frequency corresponding to said note voltage, 'an amplifier for amplifying said tone signal, and a speaker connected to said amplifier, characterized in that said note voltage generator circuit includes a plurality of first resistors connected in series between first and second terminals, a'plurality of second resistors each connected between the connection point of adjacent ones of said plurality of first resistors and a third terminal common to said first and second resistors and third and fourth resistors connected between said first and third terminals and said second and third terminals, respectively; the connection points of adjacent ones of said plurality of first resistors are connected through said keyboard switches to the one end of a DC power source connected at the other end to said third terminal; output terminals are led out from said first and third terminal
  • said notevoltagc generator circuit includes a plurality of first resistors connected in series between first and second terminals, a plurality of second resistors each connected between the connection point of adjacent ones of said plurality of first resistors and a third terminal common to said first and second resistors and third and fourth resistors connected between said first'and third terminals and said second and third terminals, respectively; the connection points of adjacent ones of said plurality fo first resistors and one point of each of said plurality of first resistors dividing it into two are connected through said keyboard switches to the one end of a DC power source conected at the other end to said third terminal; output terminals are led outfrom said first and third terminals or the mid point of said third resistor and said third terminal; and if the diminishing ratio betwen adjacent notes of the equal tempered scale is taken as 17, if the values of said first and second resistors are taken as r and R, respectively; and if the values of said third and fourth resistor
  • a monophonicelectronic musical instrument of an equal tempered scale comprising keyboard switches corresponding tonotes of said equal tempered scale, a note voltagegenerator-circuit for producing a note voltage corresponding to each of said keyboard switches in response to the depression of each of the keyboard switches, an oscillator for producing a tone signal having a frequency corresponding to said note voltage, an amplifier for amplifying said tone signal, and a speaker connected to said amplifier, characterized in that said note voltage generator circuit includes a plurality of first resistors connected in series between first and second terminals, a plurality of second resistors each connected between the connection point of adjacent ones of said plurality of first resistors and a third terminal common to said first and second resistors and third and fourth resistors connected between said first and third terminals and said second and third terminals, respectively; the connection points of adjacent ones of said plurality of first resistors and two points of each of said plurality of first resistors dividing it into three are connected through said keyboard switches to the one end of a DC power source connected at

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
US504878A 1973-09-14 1974-09-11 Monophonic electronic musical instrument of equal tempered scale Expired - Lifetime US3918342A (en)

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JP48104276A JPS5056924A (enrdf_load_stackoverflow) 1973-09-14 1973-09-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4203340A (en) * 1979-01-26 1980-05-20 O/R Inc. Electronic musical instrument
US4321851A (en) * 1979-06-28 1982-03-30 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57148197U (enrdf_load_stackoverflow) * 1981-03-13 1982-09-17

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403664A (en) * 1942-10-24 1946-07-09 Central Commercial Co Solo electrical musical instrument
US2933699A (en) * 1956-11-15 1960-04-19 Pacific Mercury Television Mfg Frequency control means for monophonic tone generating oscillator
US2962922A (en) * 1957-11-12 1960-12-06 Pacific Mercury Television Mfg Chord organ
US3180918A (en) * 1961-01-26 1965-04-27 Conn Ltd C G Tone generator system
US3283057A (en) * 1964-06-26 1966-11-01 Seeburg Corp Keyboard oscillator circuit
US3288904A (en) * 1962-09-25 1966-11-29 Hammond Organ Co Tone frequency control system for electronic musical instruments
US3395242A (en) * 1965-07-08 1968-07-30 Baldwin Co D H Preference circuit
US3538804A (en) * 1968-06-06 1970-11-10 Hammond Organ Co Electronic solo instrument having high-note guard circuit
US3651729A (en) * 1969-08-29 1972-03-28 Nippon Musical Instruments Mfg Circuit for rapid note passage in electronic musical instrument
US3666875A (en) * 1969-07-11 1972-05-30 Mario Ranzato Electronically operated stringed instruments
US3733955A (en) * 1971-12-06 1973-05-22 Venture Technology Inc Music synthesizer keyboard circuit
US3745225A (en) * 1972-04-27 1973-07-10 G Hall Musical instrument having automatic fill-in means
US3764723A (en) * 1971-03-16 1973-10-09 Nippon Musical Instruments Mfg Voltage-controlled single tone selector for use in electronic musical instrument
US3766305A (en) * 1972-07-17 1973-10-16 Hammond Corp D.c. keyed high low select preference system for polyphonic electrical musical instruments
US3786166A (en) * 1972-05-19 1974-01-15 Keio Giken Kogyo Kk Keyboard type electronic musical instrument
US3801721A (en) * 1972-06-16 1974-04-02 Baldwin Co D H Monophonic electronic music system with apparatus for special effect tone simulation
US3818115A (en) * 1971-07-08 1974-06-18 Nippon Musical Instruments Mfg Multi-channel stereophonic sound reproducing system for electronic musical instruments
US3828108A (en) * 1972-03-22 1974-08-06 F Thompson Binary organ and coding system for operating same

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403664A (en) * 1942-10-24 1946-07-09 Central Commercial Co Solo electrical musical instrument
US2933699A (en) * 1956-11-15 1960-04-19 Pacific Mercury Television Mfg Frequency control means for monophonic tone generating oscillator
US2962922A (en) * 1957-11-12 1960-12-06 Pacific Mercury Television Mfg Chord organ
US3180918A (en) * 1961-01-26 1965-04-27 Conn Ltd C G Tone generator system
US3288904A (en) * 1962-09-25 1966-11-29 Hammond Organ Co Tone frequency control system for electronic musical instruments
US3283057A (en) * 1964-06-26 1966-11-01 Seeburg Corp Keyboard oscillator circuit
US3395242A (en) * 1965-07-08 1968-07-30 Baldwin Co D H Preference circuit
US3538804A (en) * 1968-06-06 1970-11-10 Hammond Organ Co Electronic solo instrument having high-note guard circuit
US3666875A (en) * 1969-07-11 1972-05-30 Mario Ranzato Electronically operated stringed instruments
US3651729A (en) * 1969-08-29 1972-03-28 Nippon Musical Instruments Mfg Circuit for rapid note passage in electronic musical instrument
US3764723A (en) * 1971-03-16 1973-10-09 Nippon Musical Instruments Mfg Voltage-controlled single tone selector for use in electronic musical instrument
US3818115A (en) * 1971-07-08 1974-06-18 Nippon Musical Instruments Mfg Multi-channel stereophonic sound reproducing system for electronic musical instruments
US3733955A (en) * 1971-12-06 1973-05-22 Venture Technology Inc Music synthesizer keyboard circuit
US3828108A (en) * 1972-03-22 1974-08-06 F Thompson Binary organ and coding system for operating same
US3745225A (en) * 1972-04-27 1973-07-10 G Hall Musical instrument having automatic fill-in means
US3786166A (en) * 1972-05-19 1974-01-15 Keio Giken Kogyo Kk Keyboard type electronic musical instrument
US3801721A (en) * 1972-06-16 1974-04-02 Baldwin Co D H Monophonic electronic music system with apparatus for special effect tone simulation
US3766305A (en) * 1972-07-17 1973-10-16 Hammond Corp D.c. keyed high low select preference system for polyphonic electrical musical instruments

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4203340A (en) * 1979-01-26 1980-05-20 O/R Inc. Electronic musical instrument
US4321851A (en) * 1979-06-28 1982-03-30 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument

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