US3844192A - Chord control system for electronic organ - Google Patents

Chord control system for electronic organ Download PDF

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Publication number
US3844192A
US3844192A US00357389A US35738973A US3844192A US 3844192 A US3844192 A US 3844192A US 00357389 A US00357389 A US 00357389A US 35738973 A US35738973 A US 35738973A US 3844192 A US3844192 A US 3844192A
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United States
Prior art keywords
chord
pedal
pedals
keyboard
keys
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Expired - Lifetime
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US00357389A
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English (en)
Inventor
J Brand
A Carlson
B Penhollow
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Thomas International Corp
Kimball International Inc
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Thomas International Corp
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Priority to US00357389A priority Critical patent/US3844192A/en
Priority to GB1965574A priority patent/GB1448159A/en
Priority to NLAANVRAGE7405974,A priority patent/NL168354C/xx
Priority to DE2421633A priority patent/DE2421633C3/de
Priority to IT50801/74A priority patent/IT1011392B/it
Application granted granted Critical
Publication of US3844192A publication Critical patent/US3844192A/en
Assigned to KIMBALL INTERNATIONAL, INC., A CORP. OF IN reassignment KIMBALL INTERNATIONAL, INC., A CORP. OF IN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WHIRLPOOL CORPORATION, A CORP. OF DE
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Expired - Lifetime legal-status Critical Current

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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
    • G10H1/36—Accompaniment arrangements
    • G10H1/38—Chord
    • G10H1/386—One-finger or one-key chord systems
    • 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
    • Y10S84/22—Chord organs
    • 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
    • Y10S84/25—Pedal clavier

Definitions

  • ABSTRACT A semiautomatic chord control system for use with electronic organs having one or more manual keyboards and pedals.
  • a preset major chord switch and a pedal controlled chord switch are provided on the control panel for selective control of different chords to be produced in response to playing of selected root notes on the lower keyboard.
  • the organ selectively plays a major, a minor, a seventh, or a minor seventh chord depending on the setting of the chord switches and the selective use of the pedal clavier.
  • the control system plays a chord sequence of the selected type automatically upon the player depressing the desired root note on the lower keyboard.
  • a semiautomatic control is provided for the playing of accompaniment chords and bass notes.
  • three keyboards are provided including an upper manual keyboard, a lower manual keyboard, and a pedal clavier.
  • the melody is played on the upper manual keyboard.
  • An automatic control is provided for selectively causing a playing of a chord rhythm sequence in response to the playing of a single note in the lower manual keyboard.
  • the organ functions in the manner of a. normal nonchord playing organ.
  • a musical selection is being played in 3/4 time and that on the first beat of each measure, a C note is played on the pedal clavier and on the second and third beats of each measure a CEG chord is played on the lower keyboard, a rhythm sequence of a C pedal note, CEG chord and CEO chord is provided.
  • the rhythm sequence is obtained by the organist simply pressing only the C note on the lower manual keyboard.
  • the pedal clavier is'not used and the organist obtains the desired sequence of a C pedal note, CEG chord and CEO chord in 3/4 time simply by playing the C note on the lower keyboard on the first beat of each measure.
  • chords in the various accompaniment sequences. There is, however, a number of different chords which are used in accompaniment sequences which are not major chords, such other chords including minor chords, seventh chords and minor seventh chords. In each case, the chords have the same root note but utilize a different sequence of other chord notes in combination with the given root note.
  • a pair of horizontal levers are provided adjacent a set of piano keys and are utilized when depressed to cause the organ to play minor fixed chords and major fixed chords, respectively, corresponding to the bass note of the piano key.
  • the levers are played with the forefingers and the base notes are conventionally played with the other fingers and preferably with the thumb.
  • a touch bar is provided to convert from major to minor chords in any one of five rhythms with rhythm producive effects as desired.
  • a transistorized control responds to the depression of the touch bar to automatically effect the desired chord shift.
  • the Choshi Enya et al U.S. Pat. No. 3,422,210 shows a chord selecting device for use in eletronic organs wherein the pedals are used to select the root note of a chord and the type of chord is selected by pressing a suitable chord button to obtain either an augmented, a diminished, a seventh, a minor, or a major chord as the result of such a pedal depression.
  • the present invention comprehends an improved electronic organ chord system wherein pedals may be utilized to select different chord sequences, herein illustratively a minor, a seventh, or a minor seventh chord sequence, by depression thereof concurrently with a selected root note being played on the manual keyboard with the organ set for semiautomatic operation.
  • the invention comprehends the provision of a chord system for such an electronic organ wherein a control is provided permitting the player to obtain a major chord sequence by depressing any one of the keys of a selected portion of the lower manual keyboard.
  • the selected key determines the root note of the chord to be played, and in the normal mode of operation, the major chord will be automatically played by the organ.
  • the major chord will be automatically played by the organ.
  • a major C chord of CEO will automatically be played.
  • the chord initiated by the depression of the key of the lower keyboard selected section may be changed from the major chord sequence to a minor chord sequence by the player concurrently holding down any one of the pedal clavier naturals. Release of the pedal clavier natural converts the selected chord from a minor chord back to a major chord.
  • the control of the present invention is extremely simple and economical of construction, utilizing a simplified transistorized circuit for providing the above described control of the chord sequences in a novel manner.
  • the control is arranged to have switches associated with the lower keyboard root note keys and the pedal clavier naturals and sharps to effect the desired switching functioning for obtaining the desired different chord sequences as discussed above.
  • the switches are arranged to control the gating of the transistors in a novel and simple manner to provide the desired tone BRIEF.
  • FIG. 1 is a perspective view of an electronic organ provided with a chord control system embodying the invention
  • FIG. 2 is a schematic diagram illustrating the wiring arrangement of the control system with portions broken away to facilitate theillustration thereof.
  • an electronic organ generally designated is shown to include a case 11 having three keyboards, 12, 13 and 14.
  • the upper keyboard l2 may comprise an upper manual keyboard.
  • Keyboard 13 may comprise alower manual keyboard.
  • Lower keyboard14 may comprise a pedal clavier including natural pedals IS-and sharp pedals 16.
  • An expression control pedal. 17 is provided in the lower part of case 11 for controlling the volume of the sound produced by the organ. I i
  • a music rack 18 may be provided on the top of the organ and suitable stop tablets 19 may be provided on the control panel 20 of the case.
  • Control switch means 21 may further beprovided on control panel 20 for providing semiautomatic control of the organ in playing selected chord sequences when desired.
  • the present invention isdirected to an improved control generally designated 22in FIG. 2 for use with the control switches2l for providing an improved facilitated playing of such chord sequences in the semiautomatic mode of operation of the organ.
  • the control provides not only major chord sequences, but also minor chord sequences, seventh chord sequences, and minor seventh chord sequences as desired. Provision of the minor, seventh, and minor seventh chord sequences is obtained by'means of selective depression of the pedals 15 and/or 16 in a novel manner.
  • Selection of the desired accompaniment chords is effected by depression of suitable keys of a section 23 of the lower keyboard 13 in conjunction with suitable setting of the control switches 2I.
  • suitable keys of a section 23 of the lower keyboard 13 in conjunction with suitable setting of the control switches 2I.
  • the player may obtain such accompaniment by setting the control switches 21 formanual operation and then sequentially striking the C-pedal with his foot followed by striking the CEG notes in the lower. manual keyboard 13 twice in succession.
  • the switch means 21 is set for I semiautomatic operation, this sequence is obtained simply by the player depressing only the C note in the lower manual keyboard I3.
  • the C note in this case, de-
  • Switchmeans 21 of the present invention permits the player to cause the chords controlled by the selected manual keyboard note to be selectively a first type of chord, such as the major chords discussed above, and a plurality of different additional type chords, such as minor chords, seventh chords, or minor seventh chords based on the selected note.
  • control 22 automatically providesleach of four different types of chords for each of the 12 possible selected notes and, thus, automatically provides.48 different chords.
  • the selected manual keyboard notes comprise the root notes of the chords.
  • each of the keys of the octave '23 is'mechanically connected to a corresponding control switch for connection a plurality of tone generatorsto the outlet line 24.
  • key C is connected to a switch 25 which controls the output from a plurality of C chord generators 26 to the output line 24.
  • Key C is connectedto a switch 27 for controlling the output from a plurality of C chord generators 28 to the output line 24.
  • keys D, D# E, F, F G, G A, A and B are connected through similar switches to similar tone generators and the illustration in FIG. 2 is limited to only the C and C chord generators, it being understood that each of the others is similar thereto except for the different specific tone generators provided for producing the specific appropriate chords for the given note. 4
  • the C chord generators include tone generators 29 and 30 for generating the fundamental and overtone frequencies of the note C corresponding to the C key of the keyboard octave 23.
  • Tone generator 31 provides an E note
  • tone generator 32 provides a D,# note
  • tone generator 33 provides a G note
  • tone generator 34 provides an A A ⁇ note.
  • Switch means 21 includes a major chord switch 35 and a pedal control chord switch 36.
  • the natural pedals 15 of the 'pedal clavier .14 are connected respectively to different ones of a plurality of natural switches 37 and sharp pedals 16 are connected respectively to different ones of a plurality of sharp switches 38.
  • the -volt bias of line 40 is applied to the emitter Me of a transistor 44 through a connecting line 45.
  • the base 44b of transistor 44 is connected through a resistor 46 to a line 47 which, in turn, is connected through the closed series of switches 37 to ground G so that transistor 44 is saturated and an associated transistor 48 is biased off.
  • a gating signal is'applied to a diode 49 through a resistor 50 connected by a line 51 to the collector 44c of transistor 44 and collector 480 of transistor 48.
  • Base 48b of transistor 48 is connected through a resistor 52 to line 47 and emitter 48e of transistor 48 is connected to ground G.
  • Base 48b of transistor 48 is further connected through a resistor 53 to ground.
  • diode 49 The forward biasing of diode 49 permits E tone generator 31 to pass a signal through a resistor 54 to switch 25.
  • the G tone from generator 33 is passed through a resistor 55 to switch 25 and assuming that the C key 23C is depressed, the fundamental and overtone C notes produced by tone generators 29 and 30, the E note produced by tone generator 31, and the G note produced by tone generator 33 will concurrently be delivered through output 24 for soundinga CEG chord as a result of the depression of only the C key 23C.
  • the switch 36 is thrown from the positionof FIG.- 2 to engage a contact 360 connected between resistor 41 and l0-volt Zener diode 56 which, in turn, .is connected to ground. This places a l0-'volt bias on aIlin'e S'l 'cOnnected to normally open fixed contacts 38a of sharp switches 38 and 37a of natural switches 37.
  • the biasing voltage now applied to line 47 gates on transistor 48 and concurrently biases off transistor 44 so that the voltage on line 51 is removed to remove the bias from diode 49 thereby preventing passage of a tone from generator 31 when the key 23C is depressed. Therefore, the resulting chord will now become a C minor chord of C, D and G tones.
  • the player depresses any one or more of the pedal sharps 16 so as to close corresponding ones of the sharp switches 38 to engage its corresponding fixed contact 38a thereby providing a lO-volt biasing voltage to a line 61 which is connected through a resistor 62 to a diode 63 which, when forwardly biased by this voltage, permits tone generator 34 to provide an A 1% tone through a resistor 64 to switch 25.
  • the A 4* tone is added to the CEG tones to sound a C seventh chord, CEGA a
  • the user merely depresses any one or more of the pedal naturals l5 concurrently with depression of any one or more of the pedal sharps 16 so that one or more of the switches 37 is connected to its associated fixed contact 370 and one or more of the switches 38 is connected to its associatedfixed contact 38a to provide l0-volt biasing voltage to both lines 47 and 61 so that the resultant chord will be comprised of the CD G and A it tones upon depression of the key 23C.
  • the C fundamental tone generator 65 and C at overtone generator 66 are connected through switch 27 to the out e i e 24.
  • M2911 .sierressi9a9fjh9 Q.#-. @r.2#- Additional tone generators of group 28 include F tone generator 67, E tone generator 68, G 1* tone generator 69 and B tone generator 70.
  • tone generators 65, 66, 67 and 69 are actuated to produce the C F and G tones through switch 27 to output line 24.
  • tone generator 63 is connected to switch 27 through a resistor 71 and tone generator 66 is connected to switch 27 through a resistor 72, line 51 is connected to a diode 73 through a resistor 74, and thus, when biasing voltage is applied to line 51, tone generator 67 provides an F tone through a resistor 75 to switch 27.
  • Line 47 is connected through a resistor 76 to a diode 77 and, thus, when biasing voltage is pro vided on line 47, tone generator 68 produces an E note through a resistor 78 connected to switch 27.
  • Line 40 is connected through a resistor 79 to a diode 80 and,
  • Each of the other keys of the octave 23 will thusly produce similar selected major, minor, seventh, and minor seventh chords based on the corresponding root note determined by the particular key depressed.
  • 12 switches corresponding to the switches 25 and 27 are provided in association with 12 different root note chord-producing tone generator sets with the C root note and C 4' root note sets only being illustrated.
  • the present invention permits an improved facilitated playing of different types of chords based on selective root notes 5 tremely simple and straightforward, effectively minimizing cost and maintenance while yet providing the highly desirable improved facilitated playing of the organ as discussed above.
  • the foregoing-disclosure of sp'ecific'embodiments is illustrative of: the broad inventive concepts comprehend d y t n en o 1 1 (The-embodiments of theinven tion in-which an exclusive propertyor privilege is claimed-are 'defined as fol a lowsi ⁇ Cu ilv'i' 1-.'ln an electronicorgah having a manual keyboard, and pedals aisemiautomatic;chord control system comprising; selector means-for-producing selectively either a single correspondingnote ora first type of chord having-said note as the root note thereof as a result
  • chord-as a result of d epression, of ai pedal with said'selector means arranged to produce-said chord.
  • I second keyboard includes 7 a: first: group of keys corresponding tothe na'tural tones'in a musical scale and, a
  • I another-typeof chord fcomprises a i ninor chord; I 7;:The-organcontrol system of ,claim 1 wherein said another typeof' chord comprises a seventh I chord.
  • a semiautomatic chord control system comprising: a first manualkeyboard 3 having a plurality of keys; meansfor causing a chord of a first'chord type to'be sounded in response; to actuation of anyone of said keys; said chord having a root corresponding to the activated key; a second vkeyboard having a plurality of keys; and means forconditioning I said 7 secondkeyboardto, cause the contemporaneous actuation of any oneof said plurality of keys thereof to change at leastone of the notes of said chord and .f r ch ngifig' he firstchot typ 10' as c ndshsr ftyp as an incident of depressionofany number ofsaid individual keys .ofsaidsejcond'keyboard, I
  • conditioning means i ncludes'circuit'nieans for. changing a major chord to a seventh chord comprisingfirst switching means, second switching means defined by a plurality of series connected single pole, d ouble throw switchesvassociatedone each with individual keys of I I v organ includes an-upper manual keyboard and alower 1 manual keyboard-and said key'comprises a key of said a different chord.
  • said second keyboard and control means operatively associated with said switchingmeans for converting the major chord to a seventhchord as an incident of ,depression of any number of said individual keys of said second keyboard I 9.
  • the electronic organ of claim lljwherei'n' the first keyboard includes a control 'sectibfn, said plurality of keysfor selecting a chord comprising the keys of said control section.
  • chord'control system for playing selectively any one of a plurality of different major chord root notes and selector means selectively causing the depression of any selected root note key of a set of keys of-said keyboard to actuate a preselected corresponding set ⁇ of the tone generators to sound a correspondingly major chord of the selected root note, a chord'control system comprising!

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
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  • Electrophonic Musical Instruments (AREA)
US00357389A 1973-05-04 1973-05-04 Chord control system for electronic organ Expired - Lifetime US3844192A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00357389A US3844192A (en) 1973-05-04 1973-05-04 Chord control system for electronic organ
GB1965574A GB1448159A (en) 1973-05-04 1974-05-03 Chlord control system for electronic organ
NLAANVRAGE7405974,A NL168354C (nl) 1973-05-04 1974-05-03 Electronisch orgel.
DE2421633A DE2421633C3 (de) 1973-05-04 1974-05-04 Elektronische Orgel mit automatisierter Akkordbildung
IT50801/74A IT1011392B (it) 1973-05-04 1974-05-06 Apparecchiatura di comando di ac cordi per organi elettronici

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US00357389A US3844192A (en) 1973-05-04 1973-05-04 Chord control system for electronic organ

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DE (1) DE2421633C3 (it)
GB (1) GB1448159A (it)
IT (1) IT1011392B (it)
NL (1) NL168354C (it)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918341A (en) * 1974-03-25 1975-11-11 Baldwin Co D H Automatic chord and rhythm system for electronic organ
US3937115A (en) * 1974-08-01 1976-02-10 The Wurlitzer Company Electronic piano circuit arrangement
US3954039A (en) * 1975-01-30 1976-05-04 C. G. Conn, Ltd. Chord selection system for a musical instrument
US3990339A (en) * 1974-10-23 1976-11-09 Kimball International, Inc. Electric organ and method of operation
USRE29144E (en) * 1974-03-25 1977-03-01 D. H. Baldwin Company Automatic chord and rhythm system for electronic organ
US4019417A (en) * 1974-06-24 1977-04-26 Warwick Electronics Inc. Electrical musical instrument with chord generation
US4065993A (en) * 1974-12-26 1978-01-03 Nippon Gakki Seizo Kabushiki Kaisha Electronic organ with a three-finger chord and one-finger automatic chord playing mode selector
US4100831A (en) * 1976-08-09 1978-07-18 Kawai Musical Instrument Mfg. Co., Ltd. Automatic digital circuit for generating chords in a digital organ
US4106383A (en) * 1975-12-06 1978-08-15 Wersi-Electronic Gmbh & Co. Kommanditgesellschaft Register arrangement for an electronic musical instrument
US4140039A (en) * 1976-04-12 1979-02-20 Faulkner Alfred H Hand held synthesizer
US4186636A (en) * 1975-10-21 1980-02-05 Thomas International Corporation Digital chord generation for electronic musical instruments
US4197777A (en) * 1975-06-12 1980-04-15 The Wurlitzer Company Automatic chord control circuit for electronic musical instruments
US4248118A (en) * 1979-01-15 1981-02-03 Norlin Industries, Inc. Harmony recognition technique application
JPS56109398A (en) * 1980-02-01 1981-08-29 Nippon Musical Instruments Mfg Cord designating device for electronic musical instrument
EP0035636A1 (en) 1980-01-28 1981-09-16 Nippon Gakki Seizo Kabushiki Kaisha Chord generating apparatus of electronic musical instrument
US4300433A (en) * 1980-06-27 1981-11-17 Marmon Company Harmony generating circuit for a musical instrument
US4327622A (en) * 1979-06-25 1982-05-04 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument realizing automatic performance by memorized progression
US4331057A (en) * 1976-12-29 1982-05-25 The Wurlitzer Company Automatic chord control circuit for electronic musical instruments
US6380475B1 (en) * 2000-08-31 2002-04-30 Kabushiki Kaisha Kawi Gakki Seisakusho Chord detection technique for electronic musical instrument

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4216349C2 (de) * 1992-05-17 1994-06-09 Reinhold Fahrion Elektronisches Musikinstrument mit einer Melodie- und einer Begleittastatur

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US3558794A (en) * 1965-07-01 1971-01-26 Baldwin Co D H Bass register keying system
US3565995A (en) * 1968-10-17 1971-02-23 Baldwin Co D H Electronic organ employing automatic coupling of solo and accompaniment notes
US3590129A (en) * 1969-04-23 1971-06-29 Alfred B Freeman Electronic chord selection device for a musical instrument
US3665088A (en) * 1970-11-27 1972-05-23 Warwick Electronics Inc Keyer circuit for an electronic musical instrument wherein a single switch may actuate a single note or a chord
US3708604A (en) * 1971-11-15 1973-01-02 Jasper Electronics Mfg Corp Electronic organ with rhythmic accompaniment and bass
US3711618A (en) * 1971-02-22 1973-01-16 A Freeman Automatic harmony apparatus
US3712950A (en) * 1970-12-14 1973-01-23 A Freeman Automatic bass from chord apparatus
US3715442A (en) * 1970-12-15 1973-02-06 A Freeman Chord tone generator control system
US3725560A (en) * 1972-03-09 1973-04-03 Jasper Electronics Mfg Corp Chord playing organ

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US3461217A (en) * 1966-06-27 1969-08-12 Matsushita Electric Industrial Co Ltd Piano keyboard type electronic musical instrument having a bass pedal and single continuous keyboard
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US3013462A (en) * 1958-04-03 1961-12-19 Sr Frayne L Combs Chord selectors for chord organs
US3305620A (en) * 1964-07-20 1967-02-21 Hammond Organ Co Organ chord switching mechanism
US3470306A (en) * 1965-07-01 1969-09-30 Baldwin Co D H Bass register keying system
US3558794A (en) * 1965-07-01 1971-01-26 Baldwin Co D H Bass register keying system
US3548066A (en) * 1968-07-29 1970-12-15 Alfred B Freeman Plural mode automatic bass note system for musical chords with automatic rhythm device
US3565995A (en) * 1968-10-17 1971-02-23 Baldwin Co D H Electronic organ employing automatic coupling of solo and accompaniment notes
US3590129A (en) * 1969-04-23 1971-06-29 Alfred B Freeman Electronic chord selection device for a musical instrument
US3665088A (en) * 1970-11-27 1972-05-23 Warwick Electronics Inc Keyer circuit for an electronic musical instrument wherein a single switch may actuate a single note or a chord
US3712950A (en) * 1970-12-14 1973-01-23 A Freeman Automatic bass from chord apparatus
US3715442A (en) * 1970-12-15 1973-02-06 A Freeman Chord tone generator control system
US3711618A (en) * 1971-02-22 1973-01-16 A Freeman Automatic harmony apparatus
US3708604A (en) * 1971-11-15 1973-01-02 Jasper Electronics Mfg Corp Electronic organ with rhythmic accompaniment and bass
US3725560A (en) * 1972-03-09 1973-04-03 Jasper Electronics Mfg Corp Chord playing organ

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29144E (en) * 1974-03-25 1977-03-01 D. H. Baldwin Company Automatic chord and rhythm system for electronic organ
US3918341A (en) * 1974-03-25 1975-11-11 Baldwin Co D H Automatic chord and rhythm system for electronic organ
US4019417A (en) * 1974-06-24 1977-04-26 Warwick Electronics Inc. Electrical musical instrument with chord generation
US4059039A (en) * 1974-06-24 1977-11-22 Warwick Electronics Inc. Electrical musical instrument with chord generation
US3937115A (en) * 1974-08-01 1976-02-10 The Wurlitzer Company Electronic piano circuit arrangement
US3990339A (en) * 1974-10-23 1976-11-09 Kimball International, Inc. Electric organ and method of operation
US4065993A (en) * 1974-12-26 1978-01-03 Nippon Gakki Seizo Kabushiki Kaisha Electronic organ with a three-finger chord and one-finger automatic chord playing mode selector
US3954039A (en) * 1975-01-30 1976-05-04 C. G. Conn, Ltd. Chord selection system for a musical instrument
US4197777A (en) * 1975-06-12 1980-04-15 The Wurlitzer Company Automatic chord control circuit for electronic musical instruments
US4186636A (en) * 1975-10-21 1980-02-05 Thomas International Corporation Digital chord generation for electronic musical instruments
US4106383A (en) * 1975-12-06 1978-08-15 Wersi-Electronic Gmbh & Co. Kommanditgesellschaft Register arrangement for an electronic musical instrument
US4140039A (en) * 1976-04-12 1979-02-20 Faulkner Alfred H Hand held synthesizer
US4100831A (en) * 1976-08-09 1978-07-18 Kawai Musical Instrument Mfg. Co., Ltd. Automatic digital circuit for generating chords in a digital organ
US4331057A (en) * 1976-12-29 1982-05-25 The Wurlitzer Company Automatic chord control circuit for electronic musical instruments
US4248118A (en) * 1979-01-15 1981-02-03 Norlin Industries, Inc. Harmony recognition technique application
US4327622A (en) * 1979-06-25 1982-05-04 Nippon Gakki Seizo Kabushiki Kaisha Electronic musical instrument realizing automatic performance by memorized progression
EP0035636A1 (en) 1980-01-28 1981-09-16 Nippon Gakki Seizo Kabushiki Kaisha Chord generating apparatus of electronic musical instrument
US4353278A (en) * 1980-01-28 1982-10-12 Nippon Gakki Seizo Kabushiki Kaisha Chord generating apparatus of electronic musical instrument
EP0035636B1 (en) * 1980-01-28 1986-07-16 Nippon Gakki Seizo Kabushiki Kaisha Chord generating apparatus of electronic musical instrument
JPS56109398A (en) * 1980-02-01 1981-08-29 Nippon Musical Instruments Mfg Cord designating device for electronic musical instrument
US4300433A (en) * 1980-06-27 1981-11-17 Marmon Company Harmony generating circuit for a musical instrument
US6380475B1 (en) * 2000-08-31 2002-04-30 Kabushiki Kaisha Kawi Gakki Seisakusho Chord detection technique for electronic musical instrument

Also Published As

Publication number Publication date
IT1011392B (it) 1977-01-20
NL7405974A (it) 1974-11-06
NL168354B (nl) 1981-10-16
DE2421633C3 (de) 1982-10-07
DE2421633A1 (de) 1974-11-28
DE2421633B2 (de) 1979-04-12
GB1448159A (en) 1976-09-02
NL168354C (nl) 1982-03-16

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