US3629480A - Rhythmic accompaniment system employing randomness in rhythm generation - Google Patents
Rhythmic accompaniment system employing randomness in rhythm generation Download PDFInfo
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- US3629480A US3629480A US27258A US3629480DA US3629480A US 3629480 A US3629480 A US 3629480A US 27258 A US27258 A US 27258A US 3629480D A US3629480D A US 3629480DA US 3629480 A US3629480 A US 3629480A
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- pulses
- master timing
- measure
- timing pulses
- rhythmic
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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
- G10H1/40—Rhythm
- G10H1/42—Rhythm comprising tone forming circuits
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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
- 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
- G10H2210/341—Rhythm pattern selection, synthesis or composition
- G10H2210/366—Random process affecting a selection among a set of pre-established patterns
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- 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
- Y10S84/12—Side; rhythm and percussion devices
Definitions
- RHYTHM ACCOMPANIMENT SYSTEM accompaniment sounds from a free running repetitive ramp EMPLOYING RANDOMNESS IN RHYTHM waveform having a controllable repetition rate, there being a GENERATION series of master timing pulses developed by triggering ap- 31 Claims, 11 Drawing Figslitiste circuits at different ramp voltage levels during each 52 U S Cl ramp cycle. Certain of the master timing pulses are selected to 84/l.03, f each required rhythmic pattern the sdected pluses 1 Cl being employed to trigger voice circuits to produce desired nt. tones.
- CONT'DL GENERRTDR CONTROL B C m 17 a OFF g H HUTQMHT ⁇ C REPETmvE um RHYTHM g amp put i SELECTlDN 22E313 Q OENERH'TDR GENERATOR MHTPAX gwrrc g-g ROLL 3 I CONTROL aese'r l g 'IS 23 2 sin? VOICE .E I I ⁇ Ssg/ ClRCUlTS AMDL' H s im comm.
- the present system is of the free running type and is disclosed in a preferred embodiment along with alternative circuitry for providing certain features.
- Thesystem may be built into a musical instrument, such as an electronic organ. or may be separate and apart from any musical instrument or instruments with which it might be utilized for rhythmic accompani' ment.
- a rhythmic accompaniment system is actuable to function as a free running rhythm system producing selected rhythm patterns in selected tempos and tone voices and is deactuable to permit the operator to completely control the tempo and rhythm pattern.
- the system is capable of producing any one or combination of a plurality of rhythms, each rhythm comprising a two measure pattern consisting of two single measure patterns which alternate continuously. Alternatively, the two patterns may be evoked randomly if so elected by the operator.
- a downbeat lamp flashes on the first beat of each measure, and means are provided to permit tempo selection over a wide range of measures per unit time. Both manual and automatic operation may be employed either separately or together to achieve desired rhythmic effects.
- the system utilizes 13 master timing pulses per measure, the pulses being spaced by integral numbers of fixed time units to provide an overall l3 pulse measure of 24 timing units duration.
- the 13 master timing pulses are derived at corresponding levels of a repetitive ramp waveform, each ramp corresponding to one measure.
- two ramps are provided during each measure, each ramp producing seven primary pulses of which only six are employed during alternate half-measures to produce the total of l3 pulses per measure.
- various ones of these timing pulses are chosen during each measure and applied to selected voice circuits to produce the desired rhythmic sounds.
- rhythmic patterns extend over two measures.
- the musical part completed by one rhythmic pattern may be the same for all measures, while another voice in the same pattern may be two measures long.
- the part played by the bass drum is the same for each measure whereas the part played by the conga drum is periodic over two measures.
- provision is made for automatically alternating two rhythmic measures. and alternativelyfor randomly evoking two different rhythmic measures.
- four pattern modes are actuableby the operator wherein a first or second rhythmic measure may be continuously repeated, the first and second rhythmic measures may be continuously alternated, and the first and second rhythmic measures may be randomly evoked.
- a further provision of the present invention permits adjustment of the slope of the timing ramp to permit the operator to control the measure time and hence the tempo of the automatic rhythmic accompaniment.
- a further feature of the present invention permits resetting of the timing ramp whenever the system is started to assure that the system always starts on the downbeat or first beat of each measure.
- a novel cowbell voice circuit which gates on a l kHz. oscillator and a linear gate for 2 kHz. continuous oscillator, the two signals being combined to provide a realistic cowbell tone.
- certain pulses gated from a rhythm selection matrix are employed to initiate and eventually terminate trigger signals applied to drumsimulating voice circuits to produce drum roll effects over a desired number of beats in each measure.
- Still another object of the present invention is to provide a rhythmic accompaniment instrument capable of operation in four different rhythmic measure modes, including continuous alternation of two different rhythmic measures. and the random selection of said two rhythmic measures.
- Still another object of the present invention relates to the generation of 13 uniquely spaced master timing pulses from which substantially any desired rhythm pattern can be generated.
- Still further objects of the present invention include the generation of cowbell and drum roll rhythm sounds by means of novel circuitry.
- FIG. 1 is a block diagram of a preferred embodiment of the present invention
- FIGS. 2a and 2b taken together comprise a schematic circuit diagram of the timing circuits of the embodiment illustrated in FIG. 1;
- FIGS. 3a and 3b taken together comprise a schematic diagram of the rhythm selection matrix employed in the embodiment illustrated in FIG. I;
- FIGS. 4a and 4b taken together comprise a schematic cir cuit diagram of voice generator circuits utilized in conjunction with the system illustrated in FIG. 1;
- FIG. 5 is a timing diagram illustrating various master timing pulses and rhythmic patterns produced in the system of FIG.
- FIG. 6 is a schematic diagram of an alternative circuit for producing the master timing pulses required for the system of FIG. 1;
- FIG. 7 is a schematic diagram of a portion of an alternative matrix circuit for use in place of the circuit illustrated in FIGS. 3a and b;
- FIG. 8 is a schematic diagram of an alternative circuit to be provided in the system of FIG. I to permit four different modes of a rhythmic pattern operation.
- FIG. 1 of the accompanying drawings there is illustrated a block diagram of a rhythmic accompaniment system wherein closure switch S1 actuates a repetitive ramp generator 10, the frequency of which is selectively adjustable by means of frequency control element 1].
- the ramp signal is applied to a timing pulse generator 13 which provides a plurality of master timing pulses on individual signal lines, at each pulse provided at a time corresponding to a respective level of the ramp signal provided by generator 10.
- the master timing pulses occur in a repetitive pattern which comprises a musical measure.
- the master timing pulses are spaced in time in accordance with the criteria described in detail hereinbelow and are applied to respective lines in a rhythm selection matrix 15.
- Matrix 15 also receives one or more signals from automatic rhythm selection switches 17, matrix 15 being arranged so that predetermined ones of the timing pulses are provided as output pulses in accordance with which of the automatic rhythm selection switches are actuated.
- the output pulses from matrix 15 are applied to voice circuits 19 wherein appropriate accompaniment tones are generated in response to each output pulse from the matrix.
- the generated tones are combined and applied to an amplifier 21 and in turn to loud speaker 23.
- Rhythm selection matrix 15 also receives two gating signals from measure alternation control unit 25 which is essentially a bistable device. When unit 25 is in a first state it provides a B" signal which causes a rhythm selected by switches 17 to be produced in a first rhythmic pattern of output pulses from matrix 15 during each measure. Likewise, when unit 25 is in a second state it provides a C" signal which causes the selected rhythm to be produced in a second pattern during each measure.
- the state of the measure alternation control unit 25 is illustrated as being controlled either by downbeat pulse generator 27 or random oscillator 29.
- Downbeat pulse generator 27 receives the ramp signal from repetitive ramp generator and provides a pulse corresponding to the downbeat or first pulse in each measure.
- This downbeat pulse lights lamp 31 at the console of the unit and also changes the state of measure alternation control unit 25. Consequently, when downbeat pulse generator 27 is in control of unit 25, the two rhythmic pattern measures produced by signals B and C will alternate.
- the Roll oscillator output is fed to the Roll control unit 32 which responds to appropriate output pulses applied thereto from matrix 15 to apply a return Roll signal to the matrix.
- This signal gates one or more input signals to the voice circuits 19 for a predetermined period of time between two master timing pulses supplied by generator 13. During this predetermined period of time the appropriate voice circuit simulates a drum roll as opposed to the relatively short percussive sound produced by the usual output pulse for matrix 15.
- Voice circuits 19 may be actuated manually, either in conjunction with or independently of automatic voice circuit actuation, by appropriately actuating various ones of manual rhythm switches 33. lf for example, the clave manual switch is closed, each pedal actuation at console unit 35 initiates a trigger pulse, via trigger circuit 37, which passes through the pedal clave switch at unit 33 to trigger the clave voice circuit. Actuation ofa key at unit 35 likewise initiates a trigger at circuit 37 which passes through the appropriate accompaniment rhythm switch to trigger an appropriate voice circuit at unit 19.
- repetitive ramp generator 10 of FIG. 1 comprises a variable resistor P1 connected in series with fixed resistor R5 between +28 volts DC and the emitter electrode of PNP- transistor 01.
- the collector ofQl is connected via resistor R1 to the base of NPN-transistor Q3 which, along with O1, comprises a monostable multivibrator.
- the emitter of Q3 is connected directly to ground and its base is connected to ground via resistor R2.
- the center arm of variable resistor P1 is connected via resistor RS2 to the emitter of y PNP transistor Q2, the base of which is connected to +22 v. and the collector of which is returned to ground via timing capacitor C1.
- the collector of O2 is also connected to the base of NPN-transistor 04, the emitter of which is connected to the base of further NPN-transistor Q5.
- the emitters of Q4 and OS are returned to 50 volts DC through respective resistors R10 and R11.
- Transistors Q4 and Q5 and resistors R10 and R11 comprise a compound emitter follower circuit which serves to buffer the linear ramp applied to the base of Q4 from the threshold switching circuits Q6-Ql3 connected to the emitter of Q5.
- a resistor R6 which is also connected to the collector of Q3 via diode D1 and to a one-half measure bistable circuit, to be described in detail below, via diode D2.
- the collector of Q3 and the base of 01 are connected via a series connected resistor R4 and capacitor C2.
- the collector of Q3 and the emitter of 01 are connected via resistor R3 at +22 v.
- Transistor Q2 in conjunction with resistors RS2, P1. and R5, comprises a constant current generator, the current from which flows from the collector of 02 at a level depending upon the setting of P1.
- the constant current charges timing capacitor C1 to produce the required linear ramp of voltage at the base of transistor Q4; that is, if C] is initially uncharged, the voltage thereacross increases linearly.
- the linear ramp voltage which also appears at the emitter of O5, is applied in parallel to each of resistors R12 through R19, inclusive.
- Each of R12 through R19 feeds the base of a respective NPN-transistor Q6 through Q13 which are connected to progressively increasing (in a positive sense) emitter potentials.
- resistors RS1 and R20 through R33 inclusive comprise a complex voltage divider network connected between R5 and ground from which various taps are connected to the emitters of Q6 through Q13.
- the potentials connected to the various emitters vary in accordance with a desired pulse timing sequence such that normally nonconducting transistors Q6 through Q13 are gating or. at times corresponding to predetermined voltage levels of the ramp appearing at the emitter of Q5.
- Nonconduction of Q6 through Q13, in the absence of the ramp voltage at the emitter of O5, is assured by virtue of the slightly negative voltage appearing at the emitter of 05 via resistor R11.
- the collectors of ()6 through Q12 are AC coupled via capacitors C3 through C9 inclusive to the bases electrode of respective NPN-transistor switches Q14 through Q20, inclusive.
- Transistors Q14 through Q20 have their emitters returned to ground and are biased to normally conduct from +28 volts DC through their collector-emitter circuits through respective collector resistors R51 through R57. This biased-on condition is accomplished by means of +28 volts DC applied to the bases of Q14 through Q20 via respective base-bias resistors R44 through R50.
- the collectors of each of transistors Q14 through Q20 are connected to the anode of respective diodes D5 through D11, the cathodes of which are tied together and connected to the collector of NPN-transistor Q31.
- Q31 The operation of Q31 is described in greater detail subsequently; however, for present purposes it is to be understood that when Q31 conducts, diodes D5 through D11 shunt the collectors of Q14 through Q20 to ground and render them unable to provide positive-going output pulses.
- Q6 through Q12 are sequentially turned on.
- the transition from off to on of each ofthese transistors transmits a corresponding negative-going pulse via coupling capacitors C3 through C9 to the base of the appropriate transistor Q14 through 020, rendering the latter momentarily nonconductive.
- the nonconductive intervals from Q14 through Q20 produce positivegoing primary pulses at the collectors of these transistors, assuming of course that transistor Q31 is not conducting and therefore diodes D5 through D11 do not shunt the collectors to ground.
- Q13 is also turned on, causing O1 to conduct. This effectively tires the monostable circuit comprising Q1, Q3, R1, through R4, and C2.
- Pulses are applied to the base of respective NPN-transistors Q51 through Q63 inclusive.
- the emitters of these transistors are connected via respective emitter resistors REl through RE13, inclusive, to 50 volts DC, the bases being connected via respective base resistors RBI through RB13, inclusive, to +50 volts DC.
- the bases of Q51 through Q63 are connected to the anodes of respective diodes D31 through D43, inclusive, the cathodes of which are connected to the collectors of different ones of transistors Q14 through Q20. More particularly, the collector of Q14, which provides primary pulse No. 1, is connected to the cathodes of D3] and D38. Likewise, primary pulse No.
- each of transistors Q51 through Q63 is biased off by the fact that its base junction is shunted to ground by its base diode connected in series with one of the normally conducting transistors Ql4 through Q20.
- a positive-going primary pulse applied to the cathode of any one of the diodes D31 through D43 biases that diode off and thereby increase the voltage at the base of the associated transistor Q51 through Q63. If that transistor has +28 volts DC applied to its collector by the appropriate secondary pulse control line, that transistor is rendered conductive and a positive pulse, corresponding to the positive pulse applied to its base diode, appears across the emitter resistor of that transistor.
- the various signal lines numbered 1 through 13 and connected to the emitter electrodes of corresponding transistors Q51 through Q63 carry secondary pulses, or master timing pulses, to respective horizontal lines 1 through 13 of the rhythm selection matrix to be described in detail below in relation to FIGS. 30 and 3b.
- the half-measure bistable circuit comprises four NPN-transistors Q21 through Q24, inclusive, interconnected by respective coupling resistors and capacitors to pro vide bistable operation. Output transistors Q21 and Q24 are always of opposite states in accordance with the existing state of the half-measure bistable circuit.
- Secondary pulse control line 1 which as described above is connected to the collector electrodes of Q51 through Q57, is derived from the emitter electrode of Q24.
- Secondary pulse control line 2 which as described above is connected to the collector electrodes of Q58 through Q63, is derived from the emitter electrode of Q21.
- Trigger pulses are applied to the half-measure bistable circuit via capacitor C from the collector of Q3 each time the master timing ramp waveform is reset.
- the half-measure bistable circuit alternates states, and likewise secondary pulse control lines 1 and 2 alternate states.
- Q51 through Q57 are gated on by the master timing pulses
- Q58 through Q63 are gated on by the primary timing pulses.
- Q51 through Q63 are gated on sequentially over two ramp periods to provide 13 secondary or master timing pulses.
- the 13 master timing pulses constitute a musical measure, and consequently two timing ramp periods determine the duration of each measure.
- the relative spacing between the master timing pulses is determined by resistors RS1 and R20 through R33 associated with the emitter circuits of Q6 through Q13. A particular set of values, indicated in the drawings, yield a preferred timing relationship between these pulses such as that illustrated in the top line of the timing diagram in FIG. 5.
- the 13 pulse measure is divided into 24 equal time units, with adjacent master timing pulses being separated by integral numbers of units. More particularly, each ramp period or half-measure (during which pri mary pulses No. 1 through No.7 are generated) is divided into 12 equal timing units wherein primary pulses No. l and No. 2 are separated by three timing units, pulses No.2 and No.3 No. one timing unit, pulses No. 3 and No. 4 by two timing units, pulses No.
- the constant current delivered to timing capacitor C1 to generate the master timing ramp is determined by the setting of the center arm of the variable resistor P1.
- the greater the current the shorter the period of time required for the ramp voltage to trigger each successive rcsistor Q6 through Q13 and recycle itself. Since the number of ramps generated per unit time can be controlled in this manner, the measure time, and hence the tempo ofthe accompaniment system, is controlled by means of P1.
- Resistor RS2, in series with the emitter of Q2 and the center arm of P1, is preferably selected to provide a tempo of two measures per second when the center arm of P1 is set to the minimum resistance or fast" tempo position.
- RSI is selected to provide a two timing unit spacing between pulses No. 7 and No. 1, which is the same spacing as between primary pulses No.4 and No.5.
- transistor Q24 in the half-measure of bistable cir cuit is rendered conductive, signifying the start ofa measure, a pulse is applied via coupling capacitor C11 and resistors R63 and R64 to the base ofa transistor Q25.
- the collector-emitter circuit of transistor Q25 is connected in series with an indicator lamp L1 and resistor R91 between +28 volts DC and ground.
- NPN-transistor Q25 turns on, providing a current path by which lamp L1 may be lit.
- Capacitor C17 is connected across lamp L1 to ground to maintain the lamp lit for a period of about milliseconds at each downbeat or first master timing pulse in each measure.
- the control circuitry for achieving this is illustrated in the FIG. 2b and includes an alternate bistable circuit comprising NPN-transistors, Q32 and Q33 interconnected by various resistors and capacitors to provide conventional bistable operation.
- a 8" control signal is provided from the collector of Q33 and a C" control signal is provided from the collector of Q32.
- one of the B and C control signals is at +16 volts DC while the other is at substantially ground.
- Trigger signals are applied to the alternate bistable circuit via coupling capacitor C14 from the arm of a toggle switch S2.
- each pulse through downbeat lamp L1 is conducted through S2 and C14 to trigger the alternate bistable circuit.
- the alternate bistable circuit is switched by the first timing pulse of each measure and has a switching frequency which is half that of the half-measure bistable circuit.
- a trigger is applied to the alternate bistable circuit via capacitor C14 from a random oscillator circuit comprising NPNtransistors O34, Q35, and Q36. More particularly, transistors Q34 and Q35 are interconnected by appropriate resistors R84, R85, and R86 and capacitor C16 provides an oscillatory signal at the emitter of Q35 which signal has a low frequency on the order of Hz.
- This signal is applied via resistor R87 to the base of Q36 which has its collector emitter circuit connected in series with the resistor R88 between +22 volts DC and ground.
- the collector of Q36 thus provides a train of positive-going pulses of approximately 50 millisecond pulse width and approximately 200 milliseconds period. These pulses, with S2 in the random position, trigger the alternate bistable circuit at the 5 Hz. rate, which is random relative to the frequency of the ramp timing signal.
- the B and C control signals alternate state and, in a manner to be described in relation to FIGS. 30 and 3b below, determine the rhythmic pattern to be produced during each measure.
- FIG. 2b Also illustrated in FIG. 2b is a stop/start bistable circuit comprising NPN-transistors Q29 and Q30 interconnected by appropriate resistors and capacitors to operate in bistable fashion. It is the state of this bistable circuit which influences the condition of transistor 031 such that in one state of the stop/start bistable circuit Q31 is conductive to shunt the col lectors of Q14 through Q of FIG. 2a to ground via diodes D5 through D11, thereby inhibiting the primary timing pulses. In the other state of the stop/start bistable circuit, transistor Q31 is nonconductive, conduction through diodes D5 through D11 is blocked, and the master timing pulses are sequentially generated. Stop/start switch S3, a normally open grounding switch, when actuated changes the state ofthe stop/start bistable circuit via triggering capacitor C13 and a bounce suppression network including resistors R70 and R71, diode D20 and capacitor C19.
- a one-shot multivibrator including NPN-transistors Q26 and Q27 and PNP-transistor Q28 has the function of resetting the timing ramp to its start condition whenever the system is started, as by actuation of switch S3.
- the base of Q26 is connected to the collector of Q29 in the stop/start bistable circuit and its collector is connected to +28 volts DC.
- the emitter of Q26 is connected to ground via resistor R65 and is coupled to the base of Q27 via capacitor C12 and resistor R66.
- Thejunction between capacitor C12 and resistor R66 is connected to the cathode of clamping diode D14, the anode of which is connected to ground.
- the base of Q27 is connected to 50 volts DC via resistor R67.
- the collector ofQ27 is connected to +28 volts DC via resistor R68 and to the junction between resistor R6 and diode D1 via diode D2, poled for conduction through the collector-emitter circuit of Q27.
- the emitter ofQ27 is tied directly to the emitter of Q28 and, via resistor R69, to the collector of Q28.
- the base of Q28 is connected to the emitter of transistor O6, in FIG. 2a, Q6 being the first to trigger during each ramp period.
- the system is started when transistor Q29 turns off. At this time Q27 is turned on for nominally 6 milliseconds under the influence of capacitor C12 and resistor R66 via buffer Q26. The drop across C12 necessary to provide the correct transient time for Q27 is achieved by clamping diode D14 which quiescently (i.e. when 027 is off) clamps one-side of C12 substantially to ground potential.
- Q27 is conductive, timing capacitor C1 is discharged via R6, D2, and the collector emitter circuits of transistors Q27 and Q28. This effectively turns off Q6 and assures, for all practical purposes, that the ramp waveform and timing pulses produced therefrom are recycled when the system is started.
- the positive transient voltage appearing at the junction of C12 and R66 when Q29 turns off is employed via resistors R90 and R62 to trigger the alternate bistable and half-measure bistable circuits respectively. This assures that the B control signal, at the alternate bistable circuit, and secondary pulse control line 1, at the half-measure bistable circuit, are rendered positive when the system starts.
- Stop/start switch S3 is described above as being effective to stop or start the automatic rhythm accompaniment tones of the present invention.
- S3 is preferably a foot switch which when employed to stop the accompaniment effectively shunts the timing pulses to ground via diode D5 through D11 as described. Note however that the timing circuit is still opera tive in the sense that the master timing ramp sequentially actuates 06 through 013.
- switch S which is ganged to variable resistor P1
- switch S is opened to thereby apply 50 volts DC to the collectors of Q4 and Q5 via resistor R93. This effectively cuts off Q4 and Q5 and prevents application of the ramp voltage to Q6 and through Q13.
- Resistor R72 connected between the base of the emitter of 030 in the stop/start bistable circuit serves as a bias during turn on of the system power supply such that the system settles in a condition whereby Q31 is conductive to inhibit the prima ry timing pulses from 014 through Q20.
- a roll oscillator comprising NPN-transistors Q39 and Q40 interconnected by appropriate resistors and capacitors to provide an oscillatory output signal at a frequency of approximately 25 Hz.
- This signal taken from the collector of Q40, is applied to the base of PNP-transistor Q41, the emitter of which is connected to +28 volts DC and the collector of which is connected to a common junction from which the brush roll control signal (via resistor R and diode D14) and snare roll control signal (via resistor R81 and diode D15) are provided, these signals being positive pulses at the 25 Hz. rate if Q41 is not inhibited.
- NPN-transistor 037 which, along with NPN-transistor Q38 and appropriate resistive and capacitive interconnecting circuitry, comprises a roll control bistable circuit.
- NPN-transistor 037 In one state of the roll control bistable circuit 037 is conductive to ground, effectively shorting out the brush and snare roll control signals.
- Q38 In the opposite state of the roll control bistable circuit Q38 is conductive and Q37 is not, thereby rendering the brush and snare roll control signal operative to effect the appropriate simulated drum rolls as described hereinbelow.
- the state of the roll control bistable circuit is determined by the roll start signal applied to the base of Q38 and the roll finish signal applied to the base of Q37, both of which signals are received from the rhythm selection matrix described in detail in reference to FIGS. 3a and 3b.
- the roll start signal triggers Q38 on and Q37 off to enable the brush and snare roll control signals; the roll finish signal triggers 037 on to inhibit the brush and snare roll control signals.
- Shush 1 and shush 2 signals are shown. Shown is a term which refers to the background noise appropriate to some rhythm accompaniments.
- Shush l is a consistent noise level realized by connecting R7 to a suitable voice circuit in the manner described hereinbelow with reference to FIGS. 4a and 4b.
- Shush 2 refers to a noise character which decreases through the beginning portion of the measure until reaching a consistent level at the middle of the measure, which level is retained until the measure is completed. This is realized by mixing a steady noise signal, set up by RS, and a noise signal having a triangular envelope during the first half of the measure, and employing only a steady level during the second half of the measure.
- the triangular envelope is generated from the master timing ramp during a first ramp cycle via resistor R9 connected to the emitter of 05.
- secondary pulse control signal 2 provided by the emitter of Q21, is supplied by diode D4 to override the ramp signal and provide a steady level for the shush 2 signal.
- FIGS. 3a and 3b of the accompanying drawings there is illustrated a resistive matrix in which the horizontal lines are 13 in number, corresponding to the 13 master timing pulses which are applied thereto and which are illustrated in the top line of each measure in FIG. 5.
- a total of 47 vertical matrix lines are illustrated, the vertical lines being divided into eight groups representing different rhythms.
- the number of rhythm groups illustrated is by way of example only and not to be considered limiting on the scope of the present invention.
- Vertical lines and horizontal lines are selectively interconnected at appropriate junctions by 100 K resistors so that a signal is provided on each vertical line in time coincidence with a pulse on a horizontal line to which that vertical line is resistively coupled.
- vertical line 1 is seen to be resistively coupled to horizontal lines 1, 4, 7, 8, II and 13, indicating that during each measure the I, 4, 7, 8, l1, and 13 master timing pulses appear on vertical line 1.
- vertical line 29 is resistively coupled to the 4 and 8 master timing pulse lines to thereby provide the 4 and 8 master timing pulses during each measure,
- the groups into which the vertical lines are divided are as fOlIOWSl
- the LATIN III rhythm can represent the cha-cha, mambo, or samba according to the tempo selected by variable resistor P1.
- the other rhythms are self evident.
- Each vertical line l-47 is connected to the anode of a respective diode D14 through D60, respectively.
- the cathodes of D14 through D18, in the SWING rhythm group are connected to one pole ofa two-pole SWING switch which, when not actuated effectively grounds the cathodes of these diodes and thereby shunts positive pulses appearing on vertical lines 1-5 to ground.
- the SWING switch leaves the cathodes of D14 through D18 floating, thereby enabling vertical lines lto conduct their resistively coupled master timing pulses further along the circuit.
- the diodes associated with the BALLAD lines 6 through 11 are shorted to ground by one pole of the BALLAD switch unless the latter is actuated.
- the sequential pulses appearing on the vertical lines are connected to various appropriate voice circuits of FIGS. 4a and 4b, described in detail hereinbelow.
- the voice circuits respond to application of positive trigger pulses thereto to produce rhythmic sounds which simulate those produced by musical accompaniment instruments.
- the following voice circuits connected to respond to the triggers produced by the matrix of FIGS. 3a and 3b Cymbal, Snap, Snare, Bass Drum, Clave, Cowbell, and Conga Drum.
- the Cymbal trigger line is resistively coupled to vertical lines 5, I7, 26, and 47 of the rhythm selection matrix.
- the snap trigger line is a combination of the Snap A, Snap B, Snap C signals.
- the snap A signal is connected directly to the Snap trigger line and receives pulses from vertical lines 6, l2, 18, 21, 27 and 35 of the matrix.
- the Snap B signal is selectively gated to the Snap trigger line by means of series diode 87 and shunt diode 86, the cathode of the latter being connected to the B control signal provided by the alternate bistable circuit in FIG. 2b.
- the B control signal is positive, diode D86 is blocked and the Snap B signal is conducted through diode D87 to the Snap trigger line.
- the B control signal is grounded diode D86 shunts pulses appearing on the Snap B line to ground and inhibits their application to the Snap trigger line.
- the Snap B signal is derived from vertical line number 1 of the matrix.
- a Snap C signal is applied selectively to the snap trigger line via a diode gate comprising series diode D89 and shunt diode D88, the cathode of the latter being connected to the C control signal provided by the alternate bistable circuit of FIG. 2b.
- the C control signal is positive D88 is blocked and the pulses appearing on the Snap C line are connected to the Snap trigger line.
- D88 acts to shunt all Snap C signals to ground and prevent their conduction to the Snap trigger line.
- the pulses appearing on the Snap B line or those appearing on the Snap C line are conducted to the snap voice circuit via the Snap trigger line during any given measure.
- the Snap A pulses are conducted to the Snap voice circuit during every measure, irrespective of the state of the alternate bistable circuit.
- Snare A, Snare B, Snare C Bass A, Bass B, Bass C, Clave B, Clave C, Cowbell A, Cowbell B, Cowbell C, Conga A, Conga B, and Conga C signal lines, which apply pulses to their respective voice circuits.
- All of the pulses appearing on a B trigger line are gated through to their respective voice circuits only when the B control signal from the alternate bistable circuit is positive.
- all of the pulses appearing on a C trigger line are gated through to their respective voice circuits only during measures in which the C control signal provided by the alternate bistable circuit is positive. The signals are applied to their respective voice circuits during every measure.
- vertical lines 10 and 44 of the matrix are combined to provide the roll start signal, which is applied to the base of Q38 in the roll control bistable circuit of FIG. 2b.
- vertical lines I1 and 45 are combined to provide the roll finish signal, applied to the base of 037 in the roll control bistable circuit.
- the brush and snare roll control signals provided at the collector of Q41 are connected to the Snap A and Snare A lines respectively to provide a repetitive positive voltage to these signal lines, and thereby to their corresponding voice circuits, whenever a roll is to be simulated.
- Each of the SWING, BALLAD, and WALTZ automatic rhythm switches have an extra pole ganged thereto for purposes of providing shush effects. More particularly, the shush 1 signal is applied to the second pole of the SWING switch which, when actuated, applies to the shush 1 signal to the Cymbal voice circuit, to be described below in reference to FIGS. 4a and 4b.
- the second pole of the BALLAD and WALTZ automatic rhythm switches selectively apply the shush 2 signal to the Cymbal voice circuit.
- the Bass A signal is pulsed by the first, fourth, eighth, and I lth master timing pulse during each measure, these pulses being equally spaced (by six timing units) to provide the standard four beats to the measure required for the SWING rhythm.
- the Snap trigger line is pulsed by the Snap B signal during B measures at the first, fourth, seventh, eighth, llth and 13th master timing pulses, and by the Snap C signal during C measures at the first, fourth, eighth, 10th, llth and 13th master timing pulses.
- the Snap voice circuit is triggered by different pulse patterns in each measure.
- the Bass C signal pulses the base voice circuit during C measures at the seventh master timing pulse to provide an effective prebeat (by the Bass Drum) before the third pulse of alternate measures.
- the Cymbal voice circuit is triggered by the fourth and I 1th master timing pulse of each measure.
- each measure permit accurate and realistic rhythmic patterns to be produced by the present system. More particularly, since 24 is readily divisible by two, three, four, 6, six, eight and 12, a larger variety of basic rhythms are readily reproducible. For example, 4 beats to a measure, as required by the BALLAD, SWING, etc., is readily provided by simply utilizing pulses l, 4, 8, and II in each measure, these pulses being separated by six timing units each. Three beats per measure, as required by the WALTZ, is readily achieved by means of pulses l, 5, and 10, separated by 8 timing units each, in each measure.
- a faster waltz though not provided for expressly by the circuitry illus trated and described herein, can likewise be reproduced by utilizing pulses l, 3, 5, 8, l and an additional master timing pulse between pulses 11 and 12, spaced two timing units from pulse 11.
- the variety of selectable rhythms is thus substantially unlimited by virtue of the particular timing arrangement selected.
- each of the voice circuits may be triggered via specially provided manual rhythm switches (FIG. 4a) such as the bass pedal, brush pedal, clave pedal, cymbal pedal, brush accompaniment, snare accompaniment, conga accompaniment, and cowbell accompaniment switches.
- the pedal switches receive a pedal trigger generated in a manner described hereinbelow and, when actuated, apply this trigger to the corresponding voice circuits of FIGS. 4a and 4b.
- the accompaniment switches are operative to apply accompaniment triggers, generated in the manner described hereinbelow, to corresponding voice circuits.
- These manual rhythm switches are operative in conjunction with an on/off button which; in the off position, shunts the accompaniment and pedal trigger signals to ground and which, in the on position, permits application of these trigger signals to the appropriate voice circuits.
- an accompaniment trigger amplifier comprising transistors Q20 and Q21 connected in monostable multivibrator configuration. Actuation of appropriate keys at the keyboard of the electronic organ provides a signal to the accompaniment input terminal which triggers the monostable circuit to provide an accompaniment trigger pulse to four of the manual rhythm switches.
- the accompaniment trigger pulse is approximately +22 volts in amplitude and has, nominally, a 5 millisecond duration.
- a pedal trigger amplifier is illustrated and is similar to the accompaniment trigger amplifier except that two mutually exclusive input circuits are provided. One of these is used in conjunction with the monophonic pedal latch system and the other with a polyphonic system.
- the pedal trigger amplifier comprising a one-shot multivibrator including transistors Q22 and 023, provides an output pulse of the same general character as the accompaniment trigger.
- the pedal trigger is also applied to four of the manual rhythm switches as described above.
- the cymbal, snap (brush) share drum, bass drum, clave and conga drum voice circuits are conventional in nature, each responding to an input trigger applied thereto for providing a percussive tone simulating the sound signified by the name of the voice circuit.
- the clave sound simulates two hard wooden rods struck together.
- a trigger received at the base of transistor Q12 of the clave circuit gates 012 on for the duration of the trigger pulse. This renders Q13 conductive and gates on the gated oscillator configuration including transistor Q13 to provide a sinusoidal signal of decaying amplitude and of such frequency to simulate the clave sound.
- the decay period is determined by resistor R34 and capacitor C23 connected in series between the emitter of Q13 and ground.
- each of the cymbal, snap, snare drum, bass drum, and conga drum circuits Similar operation ensues in each of the cymbal, snap, snare drum, bass drum, and conga drum circuits, wherein gated oscillator of approximate frequency is triggered on by a transistor switch in response to each applied voice trigger pulse. The oscillator amplitude then decaysupon removal of the trigger pulse.
- the triggers received by each of the conga drum, clave bass drum, cymbal and snare drum voice circuit are the appropriate automatic triggers supplied by the matrix of FIGS. 3a and 3/2, or by the accompaniment or pedal triggers supplied by the manual rhythm switches in FIG. 4a.
- the Snap voice circuit receives three triggers, namely the brush accompaniment and the brush pedal trigger, as well as the automatic trigger provided by the matrix. The brush or snap voice circuit may thus be triggered manually by either pedal or key actuation.
- a novel voice circuit included in FIG. 4b is the cowbell voice circuit which, when triggered, provides a combined 1 kHz. and 2 kHz. decaying tone, the frequency of the 2 kHz. signal being prevented from shifting during the decay of the tone.
- the cowbell circuit includes a gated 1 kHz. oscillator comprising NPN-transistor transistor Q17 and associated resistors and capacitors connected to produce the 1 kHz. oscillatory signal at the emitter of Q17 whenever gating transistor 018 is triggered on by an input trigger. To this extent, the 1 kHz. signal is actuated as in the other voice circuits. Thus, when triggered, Q18 remains on for the duration of the trigger pulse, gating on the 1 kHz.
- the 2 kHz. oscillator in the cowbell voice circuit comprises NPN-transistor Q16 and associated resistive and capacitive elements interconnected to provide a continuously running 2 Hz. oscillator.
- the 2 kHz. signal is applied via capacitor CS8 to a linear gate which includes diodes D4 and D5, capacitor C38, and resistors R56 and R57. When conductive, the linear gate applies the continuous 2 kHz. signal to the common voice circuit output line via resistor R66 and capacitor C45.
- PNP-transistor Q19 experiences a reduction in base voltage which renders it conductive. This supplies gating current via resistor R55 to the linear gate, turning the latter on and permitting passage therethrough of the 2 kHz.
- the output signals from all of the voice circuits are tied to a common output line which is connected to the center arm of the volume control, a variable resistor connected between the input terminal to the pedalpreamplifier and ground.
- the shush 1 and shush 2 signal proceeds when appropriate ones of the automatic rhythm switches are actuated as described in relation to FIG. 312. More particularly the shush output line from the automatic rhythm switches is connected to the cathode of diode D2, the anode of which is connected to transistor 06 in the cymbal voice circuit.
- the common shush line in combination with the actuated switch and either of the shush 1 or shush 2 lines, provide a path for emitter current through diode D2 for transistor 06.
- the latter conducts to feed suitable signal via the cymbal voice circuit (based on transistor 09) to provide cymballike noise at the system output unit for as long as the shush 1 or shush 2 signals are selected by the automatic rhythm switches.
- shush signals are not derived from rhythmic pulses gated through the rhythm selection matrix but rather are continuous sounds generated throughout each measure.
- a shush inhibit signal applied to diode D1 in FIG. 4a from the collector of transistor 030 in stop/start bistable circuit of FIG. 2b prevents generation of a shush signal when the automatic rhythm system is off. More particularly, when the system is off, transistor 030 in the stop/start bistable circuit is nonconductive rendering the shush inhibit signal positive. This biases diode D1 on at the cymbal voice circuit and applies a positive voltage to the cathode of diode D2, which voltage is greater than the quiescent voltage at the base of transistor 06. This prevents transistor 06 from conducting as long as the shush inhibit is positive; therefore no shush signals can be generated at this time.
- FIG. 6 of the accompanying drawings there is illustrated an alternative approach to generating the master timing pulses in the system of the present invention.
- the approach is to generate one linear ramp per measure, which ramp triggers all 13 master timing pulses directly, in the same manner as the seven primary pulses are triggered in the FIG. 2a.
- the circuit of FIG. 6 includes a constant current source based on transistor 0102 which is directly analogous to the constant current source which includes transistor 02 of FIG. 2a.
- the reset monostable circuit for the ramp generator includes transistor 0101 and 0103, analogous to transistors 01 and 03 of FIG. 20. Also provided is an emitter follower buffer circuit including transistors 0104 and 0105, analogous to transistors 04 and 05 of FIG. 2a.
- the values of the various resistors and capacitors associated with transistors 0101 through 0105 differ from the values of the components employed with transistors 01 through 05 of FIG. 2a, primarily because of the nature of the ramp generated in FIG. 6 which ramp must have a duration of twice that of the ramp of FIG. 2a.
- the emitter of 0105 is coupled in parallel to the base of each of l4 transistors 0111 through 0124.
- Transistor 0124 which is driven into conduction last of all transistors 0111 through 0124 during each ramp period resets the ramp signal by triggering the reset monostable circuit comprising 0101 and 0103.
- a trigger pulse is AC coupled to a respective one of pulse generators 111 through 123, all of which are identical, only generator 123 being illustrated in detail.
- Each of the pulse generators includes a pair of NPN-transistors 0125 and 0126 connected in cascade, with the input trigger being applied to the base of0125 and the output signal taken from the emitter of 0126.
- 0125 is normally conducting and 0126 is normally nonconducting.
- transistor 0123 for example, is driven into conduction by the input ramp, a negative going transition appears at the collector of 0123 which is coupled via an input coupling capacitor to the base of0125 to turn the latter off.
- This pulse is the master timing pulse provided by the pulse generator.
- the 13 master timing pulses produced by pulse generators 111 through 123 are preferably spaced, as determined by the emitter biases for transistors 0111 through 0124, in the manner illustrated in the top line of the timing diagram of FIG. 5. As described, this particular spacing permits generation of authentic rhythm patterns not previously attainable in prior art rhythm systems. While other techniques for generating desired master timing pulse patterns may be employed in the scope of the present invention, those techniques described in relation to FIGS. 2a and 6 are believed the simplest and the most easily effected.
- FIG. 7 of the accompanying drawings there is illustrated an alternative approach to providing a rhythm selection matrix for performing the same function as the matrix illustrated in FIGS. 3a and 3b. More particularly, the 13 input timing pulses are applied to horizontal lines of the matrix just as in FIGS. 3a and 3b, and the vertical lines of the matrix are selectively resistively coupled with the various horizontal lines and grouped in accordance with the particular selected tempos. Whereas selection of the tempo in FIGS. 3a and 3b is achieved by ungrounding respective groups ofdiodes D14 through D61 by means of the automatic rhythm switches, in FIG. 7 the shunt diodes are eliminated and replaced by respective series sections of each automatic rhythm switch. Thus actuation of the SWING automatic switch closes 5 switches in series with vertical lines 1 through 5 to enable the selected master timing pulses resistively coupled to these lines to be applied to the various voice circuit trigger lines.
- the particular patterns illustrated in FIG. 5 are not limiting as to the scope of the present invention.
- Numerous combinations are of course applicable to produce other desired rhythmic effects.
- the patterns illustrated in conjunction with the matrices in FIG. 3b and 3a and FIG. 7 and in the timing diagram of FIG. 5 are believed to be most authentic in so far as simulation of standard rhythm patterns are concerned.
- additional rhythm patterns other than the eight illustrated in conjunction with FIGS. 5 and 3a and 3b may be provided by the techniques disclosed, their authenticity in simulating actual standard rhythm patterns being facilitated by the particular choice of master timing pulse spacing provided herein.
- FIG. 8 of the accompanying drawings there is illustrated a modified control circuit for providing greater flexibility in selecting measure patterns than is possible in the embodiment disclosed above. More particularly, there is illustrated in FIG. 8 the alternate bistable circuit, substantially identical to that illustrated in FIG. 2b, having a control switch S2 identical to that in FIG. 2b from which the state of the alternate bistable circuit may be controlled, either by the random oscillator or the downbeat signal as described in relation to FIG. 2b.
- a switch S6 schematically illustrated as having three positions, namely an off position, a B position, and a C position. In the B position switch S6 grounds the collector of Q32 of the alternate bistable circuit and in the C position grounds the collector of Q33.
- switch S6 therefore provides four different pattern modes, each capable of selection by the performer. These modes are:
- patterns B and C are switched at a random rate relative to the repetition rate of the measures in accordance with the random triggering from the random oscillator, thereby producing a continuously varying rhythm pattern.
- the B control and C control signals provided at respective collectors of transistors Q33 and Q32 may be employed as illustrated in FIGS. 3b to gate the various trigger lines at the output of the matrix. Alternatively these signals may be employed directly at the input circuits of each of the voice circuits of FIGS. 4a and 4b, as illustrated in FIG. 8.
- the Snap voice circuit illustrated in FIG. 8 and the Snap B and Snap C trigger lines are illustrated as being con nected to the anode of respective diodes D101 and D102, the cathodes of which are connected to respective collectors of transistors Q33 and Q32.
- diode D101 When the B control signal is high and the C control signal grounded, diode D101 is blocked and Snap B pulses are applied directly to the Snap voice circuit; diode D102 is grounded and thereby shunts the Snap C triggers to ground. Alternately, when the C control voltage is high, diode D102 is blocked permitting application of Snap C triggers to the Snap voice circuit; D101 shunts the Snap B triggers to ground.
- generator means responsive to application of pulses thereto for generating corresponding rhythmic sounds; and control means for randomly applying said first and second patterns of pulses to said generator means.
- bistable means having first and second stable states
- gating means responsive to said bistable means in said first stable state for passing said first pattern of pulses to said generator means and inhibiting passage of said second pattern of pulses to said generator means, and responsive to said bistable means in said second stable state for passing said second pattern of pulses to said generator means and inhibiting passage of said first pattern of pulses to said generator means.
- control means is selectively actuable to each of at least two discrete states for:
- timing means for providing at least first and second patterns of pulses, each of said patterns having a period corresponding to a measure of music
- generator means responsive to application of pulses thereto for generating corresponding rhythmic sounds
- control means selectively actuable to each of at least three discrete states for:
- control means is actuable to a fourth discrete state for applying only said second pattern of pulses to said generator means during each measure.
- timing means comprises:
- a matrix comprising a first plurality of conductors, a second plurality of conductors and means for conductively coupling predetermined ones of said first plurality of conductors to predetermined ones of said second plurality of conductors;
- each switch means being actuable for shorting to ground all of the conductors in its operatively associated groups via said diodes.
- said lastmentioned means comprises a plurality of manually actuable multisection switches, each switch section being connected in
Abstract
Description
Claims (31)
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US2725870A | 1970-04-10 | 1970-04-10 |
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US27258A Expired - Lifetime US3629480A (en) | 1970-04-10 | 1970-04-10 | Rhythmic accompaniment system employing randomness in rhythm generation |
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Cited By (27)
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US3742112A (en) * | 1970-10-27 | 1973-06-26 | Nippon Gakki Seigo K K | Automatic rhythm 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 |
US3764722A (en) * | 1972-06-16 | 1973-10-09 | Conn Ltd C G | Automatic rhythm system providing drum break |
US3813472A (en) * | 1971-08-20 | 1974-05-28 | Nippon Musical Instruments Mfg | Electronic musical instrument with rhythm selection pulse generator |
US3837254A (en) * | 1973-04-30 | 1974-09-24 | Conn C Ltd | Organ pedal tone generator |
US3902393A (en) * | 1974-05-01 | 1975-09-02 | Wurlitzer Co | Automatic rhythm control circuit for musical instrument accompaniment |
US3915047A (en) * | 1974-01-02 | 1975-10-28 | Ibm | Apparatus for attaching a musical instrument to a computer |
US3937115A (en) * | 1974-08-01 | 1976-02-10 | The Wurlitzer Company | Electronic piano circuit arrangement |
US3958483A (en) * | 1973-04-20 | 1976-05-25 | Hammond Corporation | Musical instrument rhythm programmer having provision for automatic pattern variation |
US3972258A (en) * | 1973-11-07 | 1976-08-03 | Nippon Gakki Seizo Kabushiki Kaisha | Automatic rhythm performance system |
USRE28999E (en) * | 1972-06-16 | 1976-10-12 | C. G. Conn, Ltd. | Automatic rhythm system providing drum break |
US4020728A (en) * | 1975-10-24 | 1977-05-03 | Kimball International, Inc. | Electronic organ with automatic keying of pedal notes |
US4058043A (en) * | 1974-11-01 | 1977-11-15 | Nihon Hammond Kabushiki Kaisha | Programmable rhythm apparatus |
US4148239A (en) * | 1977-07-30 | 1979-04-10 | Nippon Gakki Seizo Kabushiki Kaisha | Electronic musical instrument exhibiting randomness in tone elements |
US4292874A (en) * | 1979-05-18 | 1981-10-06 | Baldwin Piano & Organ Company | Automatic control apparatus for chords and sequences |
US4299154A (en) * | 1979-08-27 | 1981-11-10 | Kimball International, Inc. | Electronic rhythm generator |
US4300433A (en) * | 1980-06-27 | 1981-11-17 | Marmon Company | Harmony generating circuit for a musical instrument |
US4404883A (en) * | 1981-01-19 | 1983-09-20 | The Marmon Group, Inc. | Integrated harmony generating circuit for electronic organ |
US5153364A (en) * | 1988-05-23 | 1992-10-06 | Casio Computer Co., Ltd. | Operated position detecting apparatus and electronic musical instruments provided therewith |
WO1999039329A1 (en) * | 1998-01-28 | 1999-08-05 | Stephen Kay | Method and apparatus for generating musical effects |
US6087578A (en) * | 1999-01-28 | 2000-07-11 | Kay; Stephen R. | Method and apparatus for generating and controlling automatic pitch bending effects |
US6103964A (en) * | 1998-01-28 | 2000-08-15 | Kay; Stephen R. | Method and apparatus for generating algorithmic musical effects |
US6121533A (en) * | 1998-01-28 | 2000-09-19 | Kay; Stephen | Method and apparatus for generating random weighted musical choices |
US6121532A (en) * | 1998-01-28 | 2000-09-19 | Kay; Stephen R. | Method and apparatus for creating a melodic repeated effect |
US20170213534A1 (en) * | 2014-07-10 | 2017-07-27 | Rensselaer Polytechnic Institute | Interactive, expressive music accompaniment system |
US20220180848A1 (en) * | 2020-12-09 | 2022-06-09 | Matthew DeWall | Anatomical random rhythm generator |
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US3742112A (en) * | 1970-10-27 | 1973-06-26 | Nippon Gakki Seigo K K | Automatic rhythm instrument |
US3763305A (en) * | 1971-03-22 | 1973-10-02 | Nippon Musical Instruments Mfg | Automatic rhythm playing apparatus |
US3760088A (en) * | 1971-04-27 | 1973-09-18 | Nippon Musical Instruments Mfg | Automatic rhythm playing apparatus |
US3813472A (en) * | 1971-08-20 | 1974-05-28 | Nippon Musical Instruments Mfg | Electronic musical instrument with rhythm selection pulse generator |
USRE28999E (en) * | 1972-06-16 | 1976-10-12 | C. G. Conn, Ltd. | Automatic rhythm system providing drum break |
US3764722A (en) * | 1972-06-16 | 1973-10-09 | Conn Ltd C G | Automatic rhythm system providing drum break |
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 |
US3972258A (en) * | 1973-11-07 | 1976-08-03 | Nippon Gakki Seizo Kabushiki Kaisha | Automatic rhythm performance system |
US3915047A (en) * | 1974-01-02 | 1975-10-28 | Ibm | Apparatus for attaching a musical instrument to a computer |
US3902393A (en) * | 1974-05-01 | 1975-09-02 | Wurlitzer Co | Automatic rhythm control circuit for musical instrument accompaniment |
US3937115A (en) * | 1974-08-01 | 1976-02-10 | The Wurlitzer Company | Electronic piano circuit arrangement |
US4058043A (en) * | 1974-11-01 | 1977-11-15 | Nihon Hammond Kabushiki Kaisha | Programmable rhythm apparatus |
US4020728A (en) * | 1975-10-24 | 1977-05-03 | Kimball International, Inc. | Electronic organ with automatic keying of pedal notes |
US4148239A (en) * | 1977-07-30 | 1979-04-10 | Nippon Gakki Seizo Kabushiki Kaisha | Electronic musical instrument exhibiting randomness in tone elements |
US4292874A (en) * | 1979-05-18 | 1981-10-06 | Baldwin Piano & Organ Company | Automatic control apparatus for chords and sequences |
US4299154A (en) * | 1979-08-27 | 1981-11-10 | Kimball International, Inc. | Electronic rhythm generator |
US4300433A (en) * | 1980-06-27 | 1981-11-17 | Marmon Company | Harmony generating circuit for a musical instrument |
US4404883A (en) * | 1981-01-19 | 1983-09-20 | The Marmon Group, Inc. | Integrated harmony generating circuit for electronic organ |
US5153364A (en) * | 1988-05-23 | 1992-10-06 | Casio Computer Co., Ltd. | Operated position detecting apparatus and electronic musical instruments provided therewith |
US7342166B2 (en) | 1998-01-28 | 2008-03-11 | Stephen Kay | Method and apparatus for randomized variation of musical data |
WO1999039329A1 (en) * | 1998-01-28 | 1999-08-05 | Stephen Kay | Method and apparatus for generating musical effects |
US6103964A (en) * | 1998-01-28 | 2000-08-15 | Kay; Stephen R. | Method and apparatus for generating algorithmic musical effects |
US6121533A (en) * | 1998-01-28 | 2000-09-19 | Kay; Stephen | Method and apparatus for generating random weighted musical choices |
US6121532A (en) * | 1998-01-28 | 2000-09-19 | Kay; Stephen R. | Method and apparatus for creating a melodic repeated effect |
US6326538B1 (en) | 1998-01-28 | 2001-12-04 | Stephen R. Kay | Random tie rhythm pattern method and apparatus |
US6639141B2 (en) | 1998-01-28 | 2003-10-28 | Stephen R. Kay | Method and apparatus for user-controlled music generation |
US7169997B2 (en) | 1998-01-28 | 2007-01-30 | Kay Stephen R | Method and apparatus for phase controlled music generation |
US6087578A (en) * | 1999-01-28 | 2000-07-11 | Kay; Stephen R. | Method and apparatus for generating and controlling automatic pitch bending effects |
US20170213534A1 (en) * | 2014-07-10 | 2017-07-27 | Rensselaer Polytechnic Institute | Interactive, expressive music accompaniment system |
US10032443B2 (en) * | 2014-07-10 | 2018-07-24 | Rensselaer Polytechnic Institute | Interactive, expressive music accompaniment system |
US20220180848A1 (en) * | 2020-12-09 | 2022-06-09 | Matthew DeWall | Anatomical random rhythm generator |
US11756516B2 (en) * | 2020-12-09 | 2023-09-12 | Matthew DeWall | Anatomical random rhythm generator |
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