US3624263A - Electronic musical instrument with automatic bass performance circuitry - Google Patents

Electronic musical instrument with automatic bass performance circuitry Download PDF

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Publication number
US3624263A
US3624263A US115681A US3624263DA US3624263A US 3624263 A US3624263 A US 3624263A US 115681 A US115681 A US 115681A US 3624263D A US3624263D A US 3624263DA US 3624263 A US3624263 A US 3624263A
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United States
Prior art keywords
chord
bass
output
gate
keyboard
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Expired - Lifetime
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US115681A
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English (en)
Inventor
Yasuji Uchiyama
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.)
Nippon Gakki Co Ltd
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Nippon Gakki Co Ltd
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Publication date
Priority claimed from JP45012787A external-priority patent/JPS4944409B1/ja
Priority claimed from JP45012786A external-priority patent/JPS4939691B1/ja
Priority claimed from JP45027177A external-priority patent/JPS5011779B1/ja
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki 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
    • G10H1/36—Accompaniment arrangements
    • G10H1/38—Chord
    • G10H1/383—Chord detection and/or recognition, e.g. for correction, or automatic bass generation
    • 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
    • G10H2210/00—Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments
    • G10H2210/571—Chords; Chord sequences
    • G10H2210/616—Chord seventh, major or minor
    • 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
    • G10H2210/00—Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments
    • G10H2210/571—Chords; Chord sequences
    • G10H2210/626—Chord sixth
    • 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

Definitions

  • Another object of this invention is to provide a novel electronic musical instrument capable of carrying out a continuous chord performance in a desired rhythm pattern by depressing the keys of a manual keyboard for only a short period of time.
  • an electronic musical instrument comprising tone generators; a keyboard provided with key switches for selectively keying tone signals from the tone generators; a chord detector including first, second and third detector matrixes for detecting the root and fifth notes, the third note, and the major sixth or the minor seventh note contained in the chord being played on the keyboard; first, second and third bass selectors responsive to the outputs from the respective chord detectors for selectively deriving bass tone signals corresponding to respective notes included in the chord from the tone generators; a chord gate circuit supplied with tone signals from the tone generators through the operation of the keyboard; first, second, third and fourth base gate circuits supplied with each bass tone signals corresponding respectively to the root note, fifth note, third note and major sixth or minor seventh note from the bass selectors; and a rhythm pattern pulse generator for applying timing pulses to the chord gate circuit for opening (conducting) the same in accordance with a predetermined rhythm pattern and for supplying timing pulses to the respectively bass gate circuits to open the same in a specific order proper to the chord
  • FIG. I shows a block diagram of one example of the electronic musical instrument embodying the invention
  • FIG. 3 shows a partial circuit diagram useful in explaining the operation of the chord detector matrix shown in FIG. 2;
  • FIG. 4 shows waveforms of control outputs for explaining the operation of the circuit diagram shown in FIG. 3;
  • FIG. 5 is a circuit diagram of one example of the bass selector shown in FIG. 1;
  • FIG. 6 shows a circuit diagram of the pulse distributor shown in FIG. 1;
  • FIG. 7 shows a block diagram of a modified embodiment of the novel electronic musical instrument
  • FIG. 9 shows waveforms of input and output pulses of the timing pulse encoder shown in FIG. 7;
  • FIG. 11 shows a schematic block diagram of another embodiment of the novel electronic musical instrument.
  • tone signals for the melody performance are also derived from the tone generators 3 by the operation of the upper keyboard or the higher half portion of a single keyboard and such tone signals are converted into musical tone signals by the function of a tonecoloring filter, the output thereof being applied to the amplifier 7.
  • the first bass selector 13 which is connected to receive the control output from the first matrix is impressed from the tone generators 3 with pairs of bass tone signals 13A and 138 corresponding to the root notes and the fifth notes of respective chords being played on the chord keyboard 1.
  • the second bass selector 14 connected to receive the control output from the second matrix 11 is applied with bass tone signals 14A corresponding to the major orminor third notes of respective chords.
  • the third bass selector connected to receive the control output from the third matrix 12 is impressed with bass tone signals 15A corresponding to the major sixth or minor seventh notes of respective chords.
  • the first bass selector l3 derives from the tone generators 3 bass tone signals 13A and 13B corresponding to the root and fifth notes of the chord being played and these signals are applied to bass gate circuits l6 and 17, respectively.
  • the second detector matrix 11 produces a control output, in response to which the second bass selector l4 derives from the tone generators 3 a bass tone signal 14A corresponding to the minor or major third note, which in turn is applied to a third bass gate circuit 18.
  • the third detector matrix 12 produces a control output, in response to which the third bass selector l5 derives from the tone generators 3 a base tone signal 15A corresponding to the major sixth or minor seventh note which in turn is applied to a fourth bass gate circuit 19.
  • the bass selector may preferably have memory functions. In other words, these bass selectors may be constructed such that they memorize the types of the chords according to the control output signals from the chord detector matrixes so as to continuously derive out when the keys of the chord keyboard are once depressed and then released, bass tone signals corresponding to the played chord until a next other chord is played.
  • rhythm pattern pulse generator for preparing a timing pulse of the desired rhythm pattern to open the chord gate circuit 5 so as to automatically carry out the desired rhythmic chord performance upon operation of the chord keyboard 1.
  • the rhythm pattern pulse generator also prepares timing pulses to open the bass gate circuits 16 to 19 in a specific order conforming with the chord performance so as to automatically carry out the desired rhythmic bass performance with a rhythm conforming with the chord performance.
  • the rhythm pattern pulse generator 20 comprises a pulse generator 21 which may be an astable multivibrator having variable oscillation frequencies, a timing pulse encoder 22 connected to receive the output pulse (clock pulse) from the pulse generator 21 for selectively producing a timing pulse sequence having a desired rhythm pattern and applied to the chord gate circuit 5, and a pulse distributor 23 connected to receive from the timing pulse encoder 22 a plurality of(for example, three) pulses of varying phases so as to produce timing pulses which open the bass gate circuits 16 through 19 in a predetermined sequence.
  • outputs from the second and third detector matrixes l1 and 12 are supplied also to the pulse distributor 23.
  • chord performance can be made by intermittently deriving out from the chord gate circuit 5 tone signals which are continuously applied to the gate circuit 5 from the tone generators 3 by continuous operation of the chord keyboard 1 according to a timing pulse sequence having a rhythm pattern in consonance with the rhythm of the waltz or rhumba.
  • the first bass selector 13 When playing a music of waltz, rhumba or beguine wherein bass tones are played with three beats per one measure, if a chord [C] were played on the chord keyboard I, in other words, if the keys corresponding to C, E and G notes are depressed, the first bass selector 13 will supply a bass tone signal of C note corresponding to the root note of the played chord and a bass tone signal of G note corresponding to the fifth note to the gate circuits 16 and 17, respectively, in accordance with the output from the chord detector matrix 9 during the period in which the chord keyboard 1 is being operated. Further, a bass tone signal of E note corresponding to the third note of the chord being played is supplied to the gate circuit 18 from the second bass selector 14.
  • FIG. 2 shows a connection diagram of the chord detector matrix 9 including, first, second, and third matrixes 10, II and 12.
  • a group of chord detector key switches is designated by a reference numeral 4, the group including at least 12 key switches respectively actuated by 12 keys within one octave of the chord keyboard 1.
  • Key switches 4A to 4L are commonly connected to [2 column conductors of the first to third matrixes.
  • Column conductors of the first matrix 10 (also those of the second and third matrixes) are connected to the positive terminal (+12V) ofa source respectively through resistors r. Twelve rows or output conductors of the first matrix 10 are grounded, respectively, through resistors R.
  • the first matrix 10 functions to detect the root and fifth notes of the chord being played.
  • chord detector matrix The operation of the chord detector matrix will be described hereunder with reference to FIGS. 3 and 4.
  • FIG. 3 shows the connection of various component elements with respect to the uppermost output conductor of respective matrixes of the chord detector matrix 9 shown in FIG. 2. Corresponding elements shown in FIGS. 2 and 3 are designated by the same reference characters. The resistance values of various resistors are shown by a relationship;
  • closure of key switch 4K provides an output voltage on terminal 0 of the third matrix having the same level as that on terminal
  • closure of the key switches 4A and 4H produces a control output (negative spike from the +l2-volt level) on terminal 0, connected to the uppermost output conductor of the first matrix 10.
  • closure of the key switch 4E will produce a control output on terminal 0, connected to the uppermost output conductor of the second matrix 11.
  • closure of the key switch 4K produces a control output on terminal 0 connected to the uppermost output conductor of the third matrix 12.
  • FIG. 5 shows a circuit diagram of one example of the first bass selector 13 having a memory function and shown in FIG. 1.
  • the bass selector 13 shown comprises a plurality of flip-flop circuits F F F,, corresponding to respective chords to be played, each flip-flop circuit being comprised by a pair of transistors T, and T
  • the emitter electrodes of transistors T, of respective flip-flop circuits are commonly connected to the positive terminal (+3V of a source, whereas the emitter electrodes of transistors T are also connected to the same terminal through a common feedback impedance element L.
  • the collector electrodes of transistors T, and T are connected to the positive terminal (+15V) of a source, respectively, through resistors R, and R and resistors R, and R, are provided between the collector electrode of one transistor and the base electrode of the other transistor.
  • the base electrode of transistor T is connected to the positive terminal (+3V) of the source via resistor R.
  • the control output voltage from the first matrix 10 of the chord detector matrix 9 is applied to the base terminals K,, K, K, of respective transistors T, of respective flip-flop circuits through a diode D, with a polarity as shown.
  • a bass tone signal corresponding to the root note C are supplied to the collector electrode of transistor T, from the tone generators 3 through serially connected resistor R and diode D,. Also, a bass tone signal corresponding to the fifth note G is applied to the same collector electrode via serially connected resistor R and diode D,.
  • a resistor R is connected between the juncture between resistor R and diode D, and the root note output terminal 0, of the first bass selector 13.
  • a resistor R is connected between the juncture between resistor R, and diode D and the fifth note output terminal 0
  • the output from the first matrix 10 renders the transistor T, of flip-flop circuit F, nonconductive and the transistor T, conductive.
  • This condition persists even after disappearance of the chord-detected output.
  • the depression of keys of chord keyboard 1 corresponding to notes C and G has been memorized.
  • the first matrix 10 supplies its control output to the base terminal K of transistor T, of the flip-flop circuit F to render transistor T, nonconductive to provide bass tone signals corresponding to notes G and D for the output terminals and 0
  • the transistor T of that flip-flop circuit is rendered conductive.
  • the second and third bass selectors l4 may be constructed identically to the first bass selector 13, in which case a single bass tone signal is impressed on respective flip-flop circuits and this signal is supplied to bass gate circuits [8 and 19 via single output terminal.
  • FIG. 6 shows a circuit diagram of the pulse distributor 23 shown in FIG. 1.
  • Timing pulse encoder 22 supplies three negative pulses P P and P A3 of different phases corresponding to three beats of rhumba, beguine and waltz. Pulses P P, and P are impressed upon first, second and third gate control circuits 60, 61 and 62, respectively.
  • Each gate control circuit includes a monostable multivibrator comprised by transistors T and T and a phase inverter circuit comprised by a transistor T
  • Each multivibrator is constructed such that its transistor T is made normally conductive.
  • Input pulses P P and P are impressed upon the collector electrode of transistors T of respective multivibrators to render the respective transistors T nonconductive, thus producing positive pulses P P and P of a constant pulse width from their collector electrodes.
  • These output pulses P P and P from the multivibrators are applied to the phase inverters T to produce negative output pulses P P and P respectively.
  • Pulse P is impressed upon the first bass gate circuit 16 through a diode whereas pulses P and P are combined and commonly impressed upon the second bass gate circuit 17 through independent diodes.
  • the output from the c second matrix 11 contained in chord detector 9 (see FIG. 1) for detecting the third note and the output from the third matrix 12 for detecting the major sixth or minor seventh note are also supplied to the pulse distributor 23.
  • Negative-going output signals from the second and third matrixes 11 and 12 are applied to normally conductive transistors T and T, of the fourth and fifth gate control circuits 63 and 64, thus rendering these transistors nonconductive.
  • the emitter follower outputs from transistors T and T are applied to normally conductive transistors T and T thus rendering them nonconductive.
  • the positive output pulse P from the monostable multivibrator contained in the second gate control circuit 61 is supplied to the collector electrodes of transistors T and T
  • the positive pulse P impressed upon the collector electrode of transistor T while it is maintained nonconductive is applied to a shunting transistor T through a series circuit including a resistor and a diode, thus rendering conductive the shunting transistor T which is provided in the circuit with respect to the pulse P included in the second gate control circuit 61.
  • the output pulse P is shunted by the transistor T so that it is prevented from being applied upon the transistor T of the second gate control circuit 61. Consequently, the pulse P is not impressed upon the second bass gate circuit 17.
  • the positive pulse P impressed upon the collector electrode of transistor T while it is maintained nonconductive is impressed upon transistor T and T, through a series circuit including a resistor and a diode thus rendering these transistors conductive.
  • the pulse P impressed upon the collector electrodes of transistors T and T while they are maintained nonconductive is to be impressed upon the third and fourth bass gate circuits l8 and 19 respectively through phase inverter T and a diode.
  • the transistors T, and T are turned on by the positive pulse P which is impressed upon the collector electrode of transistor T while it is maintained nonconductive.
  • negative pulse P corresponding to pulse P is applied upon only the fourth bass gate circuit 19.
  • the pulse P from the first gate control circuit 60 in response to the pulse P, from timing pulse encoder 22 derives a bass tone signal from the first bass gate circuit l6 corresponding to the C note which is the root note of the first beat, then the pulse P obtained from the fourth gate control circuit 63 in response to the output from the second matrix 11 and the pulse P from the timing pulse encoder 22 derives a bass tone signal from the bass gate circuit 18 corresponding to the E note which is the third note of the second beat.
  • the pulse P obtained from the third gate control circuit 62 in response to pulse P derives a bass tone signal from the second bass gate circuit 17 corresponding to G note which is the fifth note of the third beat.
  • the pulse P obtained from the third gate control circuit 62 in response to pulse P derives a bass tone signal from the second bass gate circuit 17 corresponding to G note which is the fifth note of the third beat.
  • FIGS. 7 and 8 illustrate such a modified electronic musical instrument and a modified pulse distributor therefor.
  • Corresponding elements shown in FIGS. 7 and l are designated by the same reference numerals for eliminating duplicated description.
  • an output pulse I as shown in FIG. 9 is supplied to the timing pulse encoder 22 from the pulse generator 21.
  • the timing pulse encoder 22 comprises, for instance, a ring counter or a plurality of cascade-connected flip-flop circuits and a plurality of AND circuits to which are applied a plurality of combinations of the affirmation outputs and the negation outputs from respective flip-flop circuits.
  • four AND gate circuits contained in the timing pulse encoder produce four output pulses I,, I,, l and I of different phases as shown in FIG. 9 and these output pulses are supplied to distributor 23. Pulses are supplied to the first through fourth bass gate circuits 16 through 19 from distributor 23 in the order of O, to selected by the distributor.
  • output conductor group 85 connected to rhythm selector switch S diodes D are connected at crossing points between output conductor 85A and input conductor 80A; between output conductor 85B and input conductor 80B; between output conductor 85C and input conductor 80C, and these output conductors 85A, 85B, 85C and 85D are connected to output terminals 0,, O O and 0,, respectively.
  • the pulse distributor 23 shown in FIG. 8 operates as follows: when rhythm selector switches S, to S are opened, as the positive voltage (+l2V) is impressed upon the cathode electrodes of respective diodes D, these diodes are maintained nonconductive. For this reason, even when input pulses I to I are impressed upon input conductors 80A to 80D, no output (negative spike) will appear on the output terminals O to 0,.
  • rhythm selector switch S for example is closed, the positive voltage (+l2V) will be impressed upon the anode electrodes of respective diodes D connected to output conductors 81A, 81B and 81C with the result that these diodes are ready to be turned on.
  • output pulses I to l as shown in FIG. 9 are applied to input conductors 80A to 80D, respectively, from timing pulse encoder 22, output conductors 81A, 81B and 81C produce outputs which are differentiated by the action of capacitor C and resistor R Differentiated pulses are sequentially applied to the first, third and second bass gate circuits 16, 18 and 17 respectively through output terminals 0,, O and 0 as shown in FIG. 7.
  • FIG. 10A shows output pulses appearing at output terminals 0,, O and 0 of pulse distributor 23 when input pulses I, to I, shown in FIG. 9 are applied and when rhythm selector switch S, is closed
  • FIG. 108 shows the output pulses when rhythm selector switch S is closed.
  • FIG. 11 shows another embodiment of this invention which is characterized by the provision of a chord memory 25. It
  • FIG. 11 shows only one bass memory 13 and only one bass gate circuit 16.
  • chord keyboard 1 corresponding to notes C, E G of the chord [C] are depressed for a short interval so as to store the type of the chord in the memories 25 and 13, by the chorddetected output from the chord detector 9, whereupon tone signals are supplied to respective gate circuits 5 and 16 from the memories. Since timing pulses are supplied to the gate circuits 5 and 16 from the rhythm pattern pulse generator 20 the chord and bass performances as shown in FIG. 12 are performed.
  • chord keyboard when the chord keyboard is operated from a short interval at the beginning of the measure including a new chord the chord performance and the bass performance corresponding to the chord [C] will be automatically provided until the chord keyboard is operated next time, that is in the illustrated example, over a period of two measures.
  • chord keyboard when keys corresponding to notes G, B and D contained in a chord [G] are depressed for a short interval at the beginning of the third measure, the chord and bass performances corresponding to the [G] chord can be provided.
  • chord memory 25 may be comprised by a plurality of flip-flop circuits in the same manner as the bass selector shown in FIG. 5.
  • An electronic musical instrument comprising tone generators; a chord keyboard provided with key switches for selectively keying tone signals from said tone generators; a chord detector including first, second and third detector matrixes responsive to operation of said chord keyboard for detecting the root and fifth notes, the third note, and the major sixth or minor seventh note contained in the chord being played on said chord keyboard and delivering control outputs for corresponding bass notes; first, second and third bass selectors responsive to said control outputs from said chord detector matrixes for selectively deriving bass tone signals corresponding to respective notes included in the chord from said tone generators; a chord gate circuit supplied with tone signals from said tone generators through the operation of said chord keyboard; first, second, third and fourth bass gate circuits supplied with each bass tone signal corresponding respectively to the root note, fifth note, third note and major sixth or minor seventh note from said bass selectors; and a rhythm pattern pulse generator coupled to said chord gate circuit for applying timing pulses to said chord gate circuit for opening the same in accordance with a predetermined rhythm pattern and further coupled to the individual base gate circuits
  • each one of said first, second and third matrixes comprises a plurality of column conductors and a plurality of output conductors crossing said column conductors, said plurality of column conductors of each matrix corresponding to respective notes included in one octave and being connected to respective key switches actuated by the keys of said chord keyboard corresponding to said notes, each one of said column conductors of said first matrix being connect to a source of voltage via a first resistor, each one of the output conductors of said first matrix being connected to two selected output conductors of said second and third matrixes through a pair of diodes connected in series opposition, each one of the output conductors of the first matrix being grounded through a second resistor, the juncture between said diodes which are connected in series opposition being connected to said source of voltage through a third resistor, diodes being connected at two crossing points between one output conductor of said first matrix and said plurality of column conductors, and a diode being connected at
  • each one of said bass selectors comprises a plurality of flip-flop circuits, each including a normally conductive first transistor and a normally conductive second transistor, the emitter electrodes of said second transistor being connected to a common feedback impedance element, the base electrode of said first transistor being connected to output terminal of said chord detector matrix, and the collector electrode of said first transistor being connected to said tone generators whereby a bass tone signal is derived from the collector electrode of said first normally conductive transistor only when said first transistor is rendered nonconductive in response to the output from said chord detector.
  • said rhythm pattern pulse generator includes a pulse distributor for supplying timing pulses to said respective bass gate circuits which comprises first, second and third gate control circuits supplied respectively with pulses of different phases to produce timing pulses for controlling said first and second bass gate circuits, the outputs of said second and third gate control circuits being combined, a fourth gate control circuit responsive to the output from said second chord d detector matrix for preventing application of the timing pulse from said second gate control circuit to second bass gate circuit and for supplying said timing pulse to said bass gate circuit, and a fifth gate control circuit responsive to the output from said third chord detector matrix for preventing application of said timing pulse from said second and fourth gate control circuits to said second and third bass gate circuits and for supplying said timing pulse to said fourth bass gate circuit, thereby carrying out bass performance in conformity with the chord being played on said chord keyboard.
  • said rhythm pattern pulse generator includes a pulse distributor for supplying timing pulses to said respective bass gate circuits which comprises a plurality of input conductors supplied respectively with pulses of different phases, a plurality of groups of output conductors of the number corresponding to a plurality of rhythms to be played, a plurality of normally nonconductive diodes which are disposed at crossing points between output conductors of said respective groups and said input conductors in accordance with rhythm pattern corresponding to said group of output conductors, and a plurality of rhythm selector switches connected to the respective groups of output conductors for rendering conductive the diodes connected to said output conductors, whereby when one of rhythm selector switches is selectively closed, said timing pulses are supplied to said respective bass gate circuits from said respective output conductors connected to said closed selector switch.
  • chord memory which memorizes respective notes contained in a chord in response to respective outputs from said chord detector matrixes produced by operation of said chord detector matrixes produced by operation of said chord keyboard and applied continuously the tone signals to said chord gate circuit form said tone generators, thereby carrying out chord performance without necessity of continuously depressing the keys of said chord keyboard.

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US115681A 1970-02-16 1971-02-16 Electronic musical instrument with automatic bass performance circuitry Expired - Lifetime US3624263A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP1278870 1970-02-16
JP45012787A JPS4944409B1 (enrdf_load_stackoverflow) 1970-02-16 1970-02-16
JP45012786A JPS4939691B1 (enrdf_load_stackoverflow) 1970-02-16 1970-02-16
JP45027177A JPS5011779B1 (enrdf_load_stackoverflow) 1970-04-01 1970-04-01

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DE (1) DE2107409C3 (enrdf_load_stackoverflow)
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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
US3749807A (en) * 1971-04-14 1973-07-31 T Adachi Orchestral effect producing system for an electronic musical instrument
US3760088A (en) * 1971-04-27 1973-09-18 Nippon Musical Instruments Mfg Automatic rhythm playing apparatus
US3763305A (en) * 1971-03-22 1973-10-02 Nippon Musical Instruments Mfg Automatic rhythm playing apparatus
US3803970A (en) * 1972-04-19 1974-04-16 Nippon Musical Instruments Mfg Automatic rhythm device with start and stop controller for clock oscillator and a gate
US3806624A (en) * 1972-07-14 1974-04-23 Chicago Musical Instr Co Discovery in keying circuit for a musical instrument
US3825668A (en) * 1972-05-30 1974-07-23 Nippon Musical Instruments Mfg Electronic musical instrument capable of providing a third type of musical tones by operation of two keyboards in addition to the ordinary melody and chord tones
US3832479A (en) * 1972-03-01 1974-08-27 L Aliprandi Electronic apparatus for programmed automatic playing of musical accompaniment systems
FR2218603A1 (enrdf_load_stackoverflow) * 1973-02-21 1974-09-13 Eminent Electron Orgels
US3837254A (en) * 1973-04-30 1974-09-24 Conn C Ltd Organ pedal tone generator
US3842184A (en) * 1973-05-07 1974-10-15 Chicago Musical Instr Co Musical instrument having automatic arpeggio system
US3872765A (en) * 1972-12-28 1975-03-25 Pioneer Electronic Corp Chord selection apparatus for an electronic musical instrument
US3889568A (en) * 1974-01-31 1975-06-17 Pioneer Electric Corp Automatic chord performance apparatus for a chord organ
US3918341A (en) * 1974-03-25 1975-11-11 Baldwin Co D H Automatic chord and rhythm system for electronic organ
US3958483A (en) * 1973-04-20 1976-05-25 Hammond Corporation Musical instrument rhythm programmer having provision for automatic pattern variation
US3962945A (en) * 1973-06-22 1976-06-15 Wade E. Creager Foot actuated electronic organ
USRE29144E (en) * 1974-03-25 1977-03-01 D. H. Baldwin Company Automatic chord and rhythm system for electronic organ
FR2355352A1 (fr) * 1976-06-16 1978-01-13 Bergman Sune Instrument de musique electrique
US4140039A (en) * 1976-04-12 1979-02-20 Faulkner Alfred H Hand held synthesizer
US4154132A (en) * 1976-10-07 1979-05-15 Kabushiki Kaisha Kawai Gakki Seisakusho Rhythm pattern variation device
US4216692A (en) * 1977-07-06 1980-08-12 Kabushiki Kaisha Kawai Gakki Seisakusho Keyboard type automatic accompanying system
US4232581A (en) * 1975-02-21 1980-11-11 Nippon Gakki Seizo Kabushiki Kaisha Automatic accompaniment apparatus
US4276801A (en) * 1979-11-19 1981-07-07 Yerusavage Joseph A Pedal actuated musical chord system
US4307644A (en) * 1979-06-25 1981-12-29 Nippon Gakki Seizo Kabushiki Kaisha Automatic performance device
US4630519A (en) * 1984-06-23 1986-12-23 Mutsuo Hirano Device for rhythmically driving an electromechanical vibrator

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GB1467870A (en) * 1973-10-15 1977-03-23 Matsushita Electric Ind Co Ltd Rhythm playing system
GB1589984A (en) * 1976-08-23 1981-05-20 Nippon Musical Instruments Mfg Electronic musical instrument

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US3711618A (en) * 1971-02-22 1973-01-16 A Freeman Automatic harmony apparatus
US3763305A (en) * 1971-03-22 1973-10-02 Nippon Musical Instruments Mfg Automatic rhythm playing apparatus
US3749807A (en) * 1971-04-14 1973-07-31 T Adachi Orchestral effect producing system for an electronic musical instrument
US3760088A (en) * 1971-04-27 1973-09-18 Nippon Musical Instruments Mfg Automatic rhythm playing apparatus
US3708604A (en) * 1971-11-15 1973-01-02 Jasper Electronics Mfg Corp Electronic organ with rhythmic accompaniment and bass
US3832479A (en) * 1972-03-01 1974-08-27 L Aliprandi Electronic apparatus for programmed automatic playing of musical accompaniment systems
US3803970A (en) * 1972-04-19 1974-04-16 Nippon Musical Instruments Mfg Automatic rhythm device with start and stop controller for clock oscillator and a gate
US3825668A (en) * 1972-05-30 1974-07-23 Nippon Musical Instruments Mfg Electronic musical instrument capable of providing a third type of musical tones by operation of two keyboards in addition to the ordinary melody and chord tones
US3806624A (en) * 1972-07-14 1974-04-23 Chicago Musical Instr Co Discovery in keying circuit for a musical instrument
US3872765A (en) * 1972-12-28 1975-03-25 Pioneer Electronic Corp Chord selection apparatus for an electronic musical instrument
FR2218603A1 (enrdf_load_stackoverflow) * 1973-02-21 1974-09-13 Eminent Electron Orgels
US3958483A (en) * 1973-04-20 1976-05-25 Hammond Corporation Musical instrument rhythm programmer having provision for automatic pattern variation
US3837254A (en) * 1973-04-30 1974-09-24 Conn C Ltd Organ pedal tone generator
US3842184A (en) * 1973-05-07 1974-10-15 Chicago Musical Instr Co Musical instrument having automatic arpeggio system
US3962945A (en) * 1973-06-22 1976-06-15 Wade E. Creager Foot actuated electronic organ
US3889568A (en) * 1974-01-31 1975-06-17 Pioneer Electric Corp Automatic chord performance apparatus for a chord organ
US3918341A (en) * 1974-03-25 1975-11-11 Baldwin Co D H Automatic chord and rhythm system for electronic organ
USRE29144E (en) * 1974-03-25 1977-03-01 D. H. Baldwin Company Automatic chord and rhythm system for electronic organ
US4232581A (en) * 1975-02-21 1980-11-11 Nippon Gakki Seizo Kabushiki Kaisha Automatic accompaniment apparatus
US4140039A (en) * 1976-04-12 1979-02-20 Faulkner Alfred H Hand held synthesizer
FR2355352A1 (fr) * 1976-06-16 1978-01-13 Bergman Sune Instrument de musique electrique
US4154132A (en) * 1976-10-07 1979-05-15 Kabushiki Kaisha Kawai Gakki Seisakusho Rhythm pattern variation device
US4216692A (en) * 1977-07-06 1980-08-12 Kabushiki Kaisha Kawai Gakki Seisakusho Keyboard type automatic accompanying system
US4307644A (en) * 1979-06-25 1981-12-29 Nippon Gakki Seizo Kabushiki Kaisha Automatic performance device
US4276801A (en) * 1979-11-19 1981-07-07 Yerusavage Joseph A Pedal actuated musical chord system
US4630519A (en) * 1984-06-23 1986-12-23 Mutsuo Hirano Device for rhythmically driving an electromechanical vibrator
USRE32980E (en) * 1984-06-23 1989-07-11 Sanden Corporation Device for rhythmically driving an electromechanical vibrator

Also Published As

Publication number Publication date
NL169243C (nl) 1982-06-16
NL169243B (nl) 1982-01-18
NL7101958A (enrdf_load_stackoverflow) 1971-08-18
DE2107409C3 (de) 1982-10-28
DE2107409A1 (enrdf_load_stackoverflow) 1971-09-02
DE2107409B2 (de) 1978-11-30

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