Abstract: In accordance with the present invention, twelve different partials for a bass rhythm pattern are stored in only four columns of a ROM (Read Only Memory). The first three columns comprise a straight binary encoding of six different partials including the bass root, as well as no bass, while the fourth column is used for determining which of two octaves is to be played.

Abstract: Disclosed is a musical instrument and method for generating musical sound. Digital circuits produce a sequence of numbers which are converted to analog electrical signals which are periodically sampled to drive a conventional speaker. The digital circuits operate in accordance with a method of forming each sample by evaluation of a closed-form expression including a first function of time, either periodic or non-periodic, transformed by a second function of time where the second function is non-linear, non-sinusoidal and differs from the first function. The frequency spectra of the resulting musical sound can be finite and the amplitudes of frequency components do not have unwanted limitations.

Abstract: This invention relates to electric or electronic musical instruments for the production of audible musical composition ranging from quite simple to very complex arrangements. More particularly this invention is a device for the creation and editing of a musical work produced by the composer or arranger and which enables the immediate rehearsal of the fully or partially completed musical arrangement.The device is designed to be connected to an electronic musical instrument which replays the recorded composition. Such an instrument, for example, can be an electronic organ and/or an electronic musical synthesizer which accordingly either incorporates or is connected to the device.

Abstract: The electronic musical instrument is provided with a plurality of musical tone generating channels of a number smaller than that of the keys and a channel processor for randomly assigning key information representing depressed keys to the musical tone generating channels. Furthermore the musical elements including the pitch, the tone color and the envelope of the musical tones generated by respective channels are made to be different thereby imparting a random property (casualness) to the generated musical tone.

Abstract: A special effects circuit for use in an electronic musical instrument, preferably an electronic organ, including a filter circuit having variable bandpass characteristics and a tone source supplying a signal to the input of the filter circuit. The bandpass characteristics of the filter circuit are modified in accordance with a control signal. Upon the occurrence of an input signal, a control circuit provides the filter circuit with the control signal at a random or pseudo-random value. The instrument player may select the source of input signals from a variety of sources within the organ thereby determining the times or frequency at which the control signal changes but the value of the control signal is random or pseudo-random. The tone signal output from the filter circuit has randomly or pseudo-randomly attenuated frequency characteristics and is coupled to standard organ output circuits for audio presentation.

Abstract: A fixed formant filter for a digital electronic instrument of the type in which musical tones are generated from waveshape data calculated independently of frequency of the tone from constituent generalized Fourier components. The Fourier components are individually scaled by scale factors selected from a set of stored scale factors which define the transfer characteristic of the fixed formant filter. Each separately addressable stored scale factor corresponds to a different frequency value in the musical scale. A scale factor is selected for separately scaling each harmonic of the tone generated in response to the particular note of the musical scale keyed on the instrument. The selected scale factors may be modified by a frequency deviation signal to provide vibrato or other frequency modulation effects.

Abstract: Random rhythm-pattern generators have been proposed that can select one of several rhythm-patterns (i.e. pulse trains with different repetition cycles) prepared beforehand, change their playing order, and if necessary change the kind of instrumental musical sounds whenever the beating reaches a predetermined number, in order to produce a random accompaniment rhythm sound. The prior art rhythm-pattern generators played the rhythm-patterns only in a fixed order. Therefore, they had the disadvantage of providing a musical performance which was monotonous. According to this invention, this monotony of performance can be avoided because of the following construction: a random pulse generator supplies output pulses representing plural bits of a binary number to a decoder that in turn supplies an output pulse randomly to designate one of the pulse trains with different repetition cycles.

Abstract: A cybernetic music system is provided that comprises digitized music-information input capable of transmitting in real time the required music information over a narrow bandwidth channel. The system includes a peripheral music synthesizer and audio output means and is capable of reproducing the music information aurally in at least four voices. The peripheral music synthesizer comprises control circuitry, voice logic circuitry, and volume control circuitry. The system is particularly useful for individualized student instruction in and composition of music.

Abstract: An electronic musical instrument is provided with a keyboard circuit, a voltage-controlled tone signal generating circuit arrangement and a sequencer for sequentially coupling memorized pitch voltage signals to the voltage-controlled tone signal generating circuit arrangement, thereby realizing automatic arpeggio performance. The sequencer is so connected as to receive a pitch determining voltage signal from the keyboard circuit at a given timing and is so arranged that the magnitudes of pitch voltage signals coupled to the tone signal generating circuit arrangement are shifted in accordance with the pitch determining voltage signal from the keyboard circuit, thus achieving transposition of arpeggio.

Abstract: An electronic musical instrument develops digital pulses corresponding to electronic waves that are subsequently converted to audio sound such as by means of a loudspeaker. The musical instrument is provided a source of master frequency generated binary related numbers which act in conjunction with a read only memory, an adder, and a comparator, and also a counter, to control a J/K flip-flop to produce a pulse train output in which for any given cycle the starting time and duration of each pulse is controlled, thereby to determine the harmonic content of the electronic waves that are converted to audio sound.

Abstract: A device for automatic tonal accompaniment in musical instruments equipped with a rhythm unit, the fundamental, the quint, or another tone related to a chord being held and/or the chord itself becoming available in a predetermined sequence in a selected rhythm, for at least one tonal key a chord sensor is provided at whose output a signal appears in the presence of a chord, and an associated switching device is connected thereto which in the absence of a chord switches the chord sensor to detection of individual tones.

Abstract: An electronic musical box is disclosed in which a musical score can be readily stored and reproduced and the musical score can be easily changed to another. The musical box includes a pulse generator for generating a unitary pulse for a note whose duration is the shortest in the musical score and generating integer numbers of unitary pulses for other notes in the musical score. A tone pitch generating circuit generates tone pitch signals coded by a plurality of tone pitch switches so as to correspond to the tone pitches of the notes in the musical score. The coded tone pitch signals are stored in a memory, and a musical tone generating circuit reads data stored in the memory and generates musical tones.

Abstract: The device of the invention extracts a fundamental frequency from signals coming from a played musical instrument. From this is synthesized a waveform with the same fundamental frequency which can be given an arbitrary form, so that an audical impression of e.g. a violin, a trumpet or a guitar can be given to sound produced by the waveform. The waveform is produced by making a pulse train with frequency n times the fumdamental frequency, leading the pulse train to a counter activating cyclically and sequentially n different outputs. The outputs are summed with different and adjustable weights, and the waveform is determined by adjusting the n weights. The number n can be any number. An embodiment is shown with n=16.

Abstract: Circuitry for generating rhythmic patterns of notes corresponding to notes of a selected chord wherein tone signals according to the notes of the selected chord are connected to the inputs of keyers each time a chord playing key is depressed and control a current which flows through the keyers to the organ output circuitry in accordance with a selected pattern sequence of notes which is provided to a plurality of envelope generators at a rhythmic rate. The keyers are grouped to correspond to the four components of a selected chord and each of the keyer groups has an individual envelope generator connected thereto which activates the keyer group under the command of the selected pattern and imparts a characteristic attack and decay envelope to the tone signal.

Abstract: An electronic circuit for simulating the sound of a skin head percussive instrument struck with a stick includes a pair of ringing oscillators of different frequencies both triggered by pulses from the rhythm pattern generator of an electronic organ, a circuit for combining the output signals from the two ringing oscillators in preselected amplitude proportions, and a circuit for distorting the combined signal in such a way as to non-linearly amplify the combined signal so as to produce an electrical signal having characteristics such that when acoustically reproduced produces a sound highly simulative of that produced when the membrane of a skin head instrument is struck with a stick.

Abstract: An automatic chord control system is readily incorporated in an electronic organ by means of large scale integrated circuit chips. The automatic chord control causes a chord or group of notes within an octave played on the lower manual keyboard to play through the upper manual voice in the octave below the lowest melody note being played on the upper manual keyboard. The proposed automatic chord control system has two operating modes. In the first mode, the notes transferred to the upper manual are generated in direct correspondence to the keys activated on the lower manual. In the second mode, the notes transferred to the upper manual are generated by a set of preset chords activated by single lower manual keys.

Abstract: An electronic tone synthesizer in which a master data list of digital values representing the amplitudes of points defining the waveform of a musical tone are transferred to a digital-to-analog converter at a rate proportional to the pitch of the tone being generated. Noise is superimposed on the musical tone by means of a random binary signal generator which controls a circuit for modifying selected ones of the digital values as they are transferred from the master data list to the converter. Modification of the selected values may be by a right shift operation, a 2's complement operation, or by selective delay.

Abstract: A key input apparatus is provided with a plurality of input operation keys and a time signal generating circuit which in correspondence to the number of these input keys performs a step operation to generate in turn a different timing signal. Input signals produced by actuation of the input operation keys pass through a group of first AND gates in synchronism with the corresponding timing signals generated from the timing signal generating circuit. A shift register having bits corresponding in number to the gates of the group of first AND gates receives the output signal of the AND gates via an OR gate. The output signal from the OR gate is applied to one input terminal of a second AND gate of which the other input terminal is coupled with the last bit position of the shift register through an inverter. The outputting operation of the second AND gate is controlled by the shift register and inverter.

Abstract: A keyboard electronic musical instrument comprises a note information processing device capable of processing note information required for automatic arpeggio and automatic bass performances. This note information processing device includes a generation circuit for generating a plurality of note information representing a plurality of notes to be sounded in relation to the key depression, a selection circuit for sequentially selecting a note information designating a note to be sounded from among the plurality of note information from the generation circuit in accordance with a predetermined priority order; an output circuit for delivering out the note information selected by the selection circuit, the selection at each sequence being conducted dependent on the selection at the preceding sequence.

Abstract: An automatic arpeggio for a keyboard-operated instrument in which a tone generator is assigned to a key when the key is actuated, the fundamental frequency of the assigned tone generator being determined by octave and note data stored as a control word in a memory in response to operation of the key. On keying the different notes of the arpeggio chord on the keyboard and activating an arpeggio Load switch, a control word is loaded in the memory for each key of the arpeggio chord, the words being coded to identify the value of the note and the sequence number of the note in the arpeggio chord. The arpeggio chord control words in memory are transferred one at a time to a tone generator in a sequence according to the stored sequence numbers of the control words. Arithmetic means, in synchronism with an arpeggio clock, generates note sequence numbers by which the control words are addressed in memory. The note value is transferred to the tone generator together with octave information from the arithmetic means.

Abstract: A method and apparatus for memorizing and playing back an accompaniment passage in an electronic organ wherein the keyboard is multiplexed to develop a serial input data stream having keydown signals in the time slots corresponding to the depressed keys, selectively writing into a programmable random access memory data corresponding to the absolute address of the first occurring keydown signal in the pulse train and then writing into the memory data corresponding to the intervals, expressed in terms of time slots in the multiplexed data stream, between a number of the first occurring keydown signals, beginning with the first occurring signal. The data is read out of the memory and converted to a serial time division multiplexed data stream by means of comparators which produce a pulse each time there is a compare condition between the output of the memory and the count produced by the master counter/subcounter.

Abstract: An electronic organ includes a read-only memory which stores eight bit binary words each having a digital value proportional to the frequency of a different note. When a chord keyswitch is actuated, a corresponding chord selector controlled by a multiplexer circuit causes the randomly addressable memory to sequentially generate binary words corresponding to the frequencies of the notes forming the selected chord. Each binary word is stored in a latch associated with a different universal tone generator capable of generating any tone as controlled by the stored binary word. Each universal tone generator includes a comparator which recognizes a match between the associated latch and a counter which receives clock pulses from a single fixed frequency oscillator. The comparator resets the counter and generates an output pulse which is divided to form an audible tone signal.

Abstract: An electronic organ employing the technique of multiplexing at least the solo portion of the keyboard and which includes an automatic chord playing circuit which plays chords in the solo voices corresponding to the accompaniment portion of the keyboard in response to depression of one of a predetermined group of keys of the accompaniment portion of the keyboard. The organ includes circuitry for automatically sounding notes corresponding to the chord selected in the accompaniment portion singly and sequentially from a selected end of the solo portion of the keyboard to the opposite end thereof, and further selectable to begin at one end of the solo manual proceeding to the other end thereof and sounding in reverse order back to the first mentioned end of the manual. If desired, the arpeggio run may be terminated at a selected point on the keyboard short of either end thereof.

Abstract: An electrical musical instrument having a digital circuit which automatically generates selected chordally related tone signals in response to manual selection of a root note. A root encoder provides a binary code representative of the root note in response to note selections, and an interval code generator automatically provides code signals having binary number values equal to the number of half steps from the root for a given interval. An adder arithmetically adds the root code and the interval code to generate a code for a chordally related note having both octave and note information corresponding to the automatically generated tone signal. In one mode of operation, the root code represents the root of the root-fifth pair of highest priority around the circle of fifths selected on a manual keyboard. In another mode, the root code is representative of a note selected on the pedal clavier.

Abstract: In an electronic musical instrument, numerical values corresponding to respective notes are generated on a time-shared basis, the generated numerical values are cumulatively added for each note in synchronism with a predetermined time slot and carry signals coming out as results of the accumulations of the respective numerical values respectively constitute note frequency signals. By simplifying a tone source circuit in this manner and by selecting generated frequency signals in accordance with depression of keys, the number of conductors connecting a keyboard circuit with the tone source circuit can be reduced.

Abstract: An electronic rhythm generator particularly suited for incorporation in an electronic organ. A counter, clocked by time sequential rhythm clock pulses, produces a cyclically repeating series of counts comprising binary words having a most significant bit and a plurality of least significant bits which address a read only memory having a plurality of preprogrammed rhythm patterns stored therein. The memory comprises two sections in which a first set and a second set of rhythm patterns respectively are stored and which is programmed such that one of the sections is enabled only when the most significant bit of the counter output is a logic 1 and the other section is enabled only when the most significant bit is a logic 0. The memory responds to a series of sequential enabling signals on certain of its address lines corresponding to the respective least significant bits of the binary words to produce at its output rhythm signals in the rhythm patterns selected within its enabled section.

Abstract: An electronic musical instrument comprises an automatic rhythm performance device, an automatic bass chord performance device and an automatic arpeggio performance device. Each device has its own start-stop control circuit and a control in/out terminal. When a device is start-stop controlled, a control signal appears at the control in/out terminal, whereas if a control signal is externally applied to the control in/out terminal, the device is start-stop controlled. The control in/out terminals of the respective devices are connected together by a common line so that a start-stop of one device causes the start-stop of other devices.

Abstract: A circuit intended for use with electronic organs and, more specifically, with those electronic organs in which the keyboard switches are multiplexed, and which circuit provides a method for automatically sounding in succession either the natural notes (white keys) or the sharped notes (black keys) to create a glissando effect, beginning at either the upper, or lower, end of the solo manual and continuing down, or up, the manual at least until the note which is depressed by the player is reached. This simulates the effect of the organist running his finger from one end of the manual partially down, or up, the manual and reaching the previously mentioned depressed key.

Abstract: A CPU of a computer, or preferably a so-called microprocessor controls the tone waveshape generation. A tone generator unit, an instrument keyboard unit, a tone quality control unit are connected to a common data bus to which the CPU and the associated memories are also connected. Thus, the tone generator unit may be considered as a terminal unit of a computer system. Hence, the freedom in selecting the algorithm for generating a waveshape and the freedom in selecting and changing the parameters related to the waveshape generation are substantially increased. And therefore a gradually changing waveshape is very easily generated in one embodiment of this invention.

Abstract: An electronic musical instrument comprises an upper keyboard channel, a lower keyboard channel and a pedal keyboard channel. The lower keyboard channel includes a tone gate which is actuated by a chord rhythm pattern pulse generated by an automatic rhythm generator to gate the lower keyboard tones. The pedal keyboard channel includes a root/subordinate tone generator which provide a root tone designated by the depressed pedal key and subordinate tones related to the root tone with predetermined musical intervals, and a tone keyer which is actuated by a bass rhythm pattern pulse generated by the automatic rhythm generator to gate the bass tones.

Abstract: A digital electronic musical instrument which produces musical notes by approximately reproducing a waveshape based on information of points of extremal values on a musical waveshape, storing the approximate waveshape after sampling it with the number of the frequency at which the notes are to be produced and reading out the stored waveshape with a predetermined clock.

Abstract: A pedal teaching system for an electronic musical instrument, specifically an electronic organ. In the rehearse mode of operation the system rhythmically energizes selected ones of a plurality of lights mounted above the pedal clavier to illustrate which pedals form a bass note accompaniment routine for a specific group of keys depressed by the organist and automatically sounds the bass note routine. In the perform mode of operation the system rhythmically energizes selected ones of the plurality of lights to illustrate which pedals form the bass note accompaniment routine and disables the automatic bass note musical output routine so that the organist must physically depress the actual pedals to provide the bass note accompaniment.

Abstract: In an electronic musical instrument of the type in which pitch selection is achieved by pulse position modulation, and a rhythm accompaniment is played automatically under the direction of a read-only memory, a shift register is used to create pulse position modulation instructions for harmonic footages of the fundamental note, and selected combinations of these footages are rhythm-modulated and rhythm-counter-modulated under the control of logic gates which are responsive to various manually operated stop tabs.

Abstract: An electronic musical instrument including key switches which are connected in a matrix of twelve note lines times six octave lines. The note lines are scanned cyclically at a high speed and the octave lines are detected one by one cyclically to determine the closed key switches. Everytime a closed key switch is detected, the scanning operation pauses for a predetermined period of time and a note indicating signal is delivered. The note indicating signal causes the production of a tone signal of that note for a predetermined octave. The number of the detection cycles is counted by a counter, and the detection of the same note in the next cycle causes the production of a tone signal of the same note for the next octave, the counter causing the shifting of the sounding octave. The octave shifting is repetitively carried out upward or downward or reciprocally within a range of certain octaves. Thus an automatic arpeggio performance is realized.

Abstract: The present invention is an arpeggio system for use in a musical instrument having a multiplexed keyboard, wherein operated playing keys are represented by cyclic pulses in corresponding time slots in a serial time division multiplex data format, connected over a single bus to a multiplexed pitch generator system for producing tones at pitches corresponding to the time slots in the serial data stream in which the cyclic pulses representing operated playing keys appear. The arpeggio system is connected in the serial data path in repeater fashion so as to be operated under control of the serial data stream received from the keyboard to selectively retransmit cyclic pulses in the serial time division multiplex data format to the pitch generator system.

Abstract: This disclosure pertains to a digitalized music synthesizer functioning in the real time domain to continuously update, in an asynchronous manner, a continuing approximation of a desired waveform by utilizing its memory of the recent history of the operation of the keyboard of the apparatus. A real time clock and a microcomputer are both driven by a single crystal oscillator, operating at any arbitrary frequency that need not correspond with the frequency of the fundamental or harmonic waves to be produced by the apparatus. A memory of the recent history of keyboard events is maintained. The microcomputer utilizes an algorithm employing square waves as a basis and a differential correcting technique which minimizes the quantity of square wave defining terms that need be computed by only recomputing at each time, corrections to the previous computation.

Abstract: A multichannel recording medium storer which samples the time course of notes produced by an instrument and an address for each of these samples. An interchangeable keyboard transmits a signal or signals to an electronic computer as to which note or notes are to be reproduced. The electric computer reads the note or notes to be reproduced from the recording medium and from the sample produces a faithful reproduction of the sustained note or notes. The result is available for recording on one channel of the recording medium or for reproduction on a speaker. The instrument is useful for the preparation of musical compositions and for educational purposes and demonstrations.

Abstract: An electronic musical instrument of a type having automatic performance functions includes means for switching a tone production mode to another tone production mode without stop of tone production when the automatic performance is stopped, so that a smooth continuation of a manual performance after the automatic performance is ensured. When an automatic arpeggio performance producing a tone of a percussion type envelope is stopped, the tone envelope is switched to a sustain type envelope and the tone is kept produced as long as the key for the tone is kept depressed. In an automatic bass/chord performance producing intermittent bass tones and chord tones, bass tones and chord tones are continuously produced after stopping of the automatic bass/chord performance.

Abstract: A key code generator for electronic musical instruments which has a group of memories respectively corresponding to blocks of key switches and temporarily storing their closed state, a block detector for detecting the memories corresponding to the blocks that even one key switch is in its closed state, a priority selector for sequentially designating the detected blocks in the order of priority, a block designating gate means for supplying clock pulses to the memories corresponding to the designated blocks to serially derive therefrom their information in accordance with the output from the priority selector, an encoder for encoding the output from the priority selector into a binary code, a counter for counting the clock pulses outputted from the block designating gate means, means for gating the count value of the counter and the binary code designating each block with the serial output read out of each memory, means for detecting a change in the binary code, and means for resetting the counter with the out

Abstract: An electronic musical instrument is of a type wherein musical tone waveforms are stored in a memory as their sampled amplitudes and sequentially and repetitively read out to constitute tone waveforms. A key depression brings forth key code in a digital representation. This key code is used for reading out frequency information from a frequency information memory. The frequency information is accumulated to make an address signal for reading out the waveform memory.When a key is depressed, a counter starts counting and opens a gate for a predetermined period of time. The gate passes a code representative of an interval of a grace note with respect to the note of the depressed key (i.e. principal note) to an addition and subtraction circuit for addition or subtraction between the key code and the code representative of the interval for the grace note. Accordingly, the key code is modified and the desired grace tone is produced.

Abstract: A programmable rhythm unit is disclosed for electrically simulating sounds of a plurality of rhythm instruments being played in selected ones of a plurality of different rhythmic patterns. A variable frequency oscillator cooperates with a counter/divider and decoder circuit to provide a predetermined number of beats or pulses per measure at a tempo which may be varied by the user. Also provided is a plurality of keyed audio circuits which each produce a characteristic burst of output signals that simulate the audible output or voice of a corresponding rhythm instrument. Switching means are provided whereby the user can select any of the voices to play at any beat position. In addition an alternate beat pulse source is provided which can be selected by the switching means to play any of the voices at a particular beat position every other measure. A pseudo-random generator is also included which may be selected to play any of the voices at a random beat position in each measure.

Abstract: An automatic accompaniment apparatus in an electronic organ having a keyboard for melody provided with a plurality of key switches for accompaniment, respective ends of the key switches being connected to a voltage generating circuit and respective opposite ends of the key switches being connected to a chord gate circuit through memory circuits. A key selection circuit for selecting a key of music is provided so that a rhythm accompaniment tone corresponding to a melody is obtained as an output signal from the chord gate circuit. A rhythm pulse is generated from a rhythm pulse generator. Connected between the key switches and the voltage generating circuit is a switch element and a keying pulse generator connected to the switch element.

Abstract: There is disclosed an electronically adaptive player piano roll to magnetic tape formatting system which adapts itself to play the expression music generated from different sources. A plurality of control bits are inserted into vacant or unused bit positions of a prior art time division multiplex frame of musical data encoded, preferably, in a bi-phase mark/space code. The control bits identify the particular type of player piano roll music which has been well known in the prior art, such as a Welte, Ampico or Duo-Art, each of which have different manners of expression for reproducing the playing style of the original artist.

Abstract: A sequence generator for a polyphonic tone synthesizer in which a repetitive sequence of musical notes or chords are generated automatically. During a Code mode of operation, each key operated on the keyboard causes an associated data word identifying the specific key by keyboard, octave and note to be stored in a memory. Time data as to the relative time the note is to go on and go off is also stored as part of the data word. During a Play mode of operation, the data words are read out of memory in the sequence in which they were generated. The words are decoded and the time data compared with a real time clock to provide signals to the output of the keyboard which duplicate the signals from the corresponding keys. The time duration of these signals is controlled by the time on and time off data to duplicate the required time that the respective notes are to be played.

Abstract: An electronic musical instrument comprising a plurality of tone forming systems having mutually different tone production modes. One of such tone forming systems can produce a tone continuously while another of such systems can produce a tone intermittently. Further, in a case where a plurality of tones are to be produced, one of such systems can produce these tones intermittently one tone after another while another of such systems can produce these tones simultaneously and intermittently. By producing tones from such systems of different tone production modes, an intricate musical tone effect is obtained.

Abstract: An electronic musical instrument capable of producing a performance effect resembling arpeggio. Tones corresponding to one or more depressed keys are sequentially produced from the lowest tone or the highest tone and an octave range in which tones are produced is shifted toward a higher octave or a lower octave at completion of each cycle of the tone production sequence. This shift of octave is continued to a certain predetermined octave and, after the tone production in the predetermined last octave has been completed, the tone production is repeated from the original octave or the tone production is conducted with the octave range being shifted in a reverse direction.For realizing simulation of arpeggio, plural key information produced by depressing a plurality of keys needs to be selected in a predetermined sequence. To this end, an up-down counter is employed in an example of the present invention.

Abstract: An organ performance supporting device which has means for detecting ON signals of actuating switches of combination units to provide control code signals, means for setting signals indicating the individual operative states of the switches by the switch-ON detecting signals, a read-only memory for storing coded control signals necessary for the presetting and selection of registrations, the coded control signals being selectively read out in reply to the detected control code signals, a combination registration memory composed of a writable memory and a read-only memory, the combination registration memory storing registrations required by the combination unit and selectively read out in reply to the detected control code signals, a register supplied with a signal from a stop switch and reading out the writable and read-only memories in a predetermined operative state to store the state of the combination unit and the ON-OFF state of the stop switch, a register for storing the registration output from each c

Abstract: Disclosed is a digital arpeggio system for an electronic organ that through the use of digital techniques permits arpeggios, note sequences as well as strum, multi, organ, and normal modes of operation to be played automatically. Two counters scan by counting through an 8.times.8 matrix of 64 words covering the 61 notes of an organ in rapid sequence upon the playing of one or more organ keys. Each word is fed to a corresponding one of 61 decoders, one for each note of the keyboard. If a corresponding key has been played, the decoder provides a signal to a corresponding pulser circuit which enables a corresponding keyer to transmit an audio signal from an audio oscillator corresponding to the played key to an output system and loudspeaker. The two counters are stopped by a clock control while the note is sounded and then the counters are enabled by the counter control to continue counting through the matrix until the next actuated key is located.

Abstract: A bell tower arranged to permit a single person to ring a substantial number of bells as in the playing of a musical selection. The bell tower includes a stand for supporting a plurality of bells suitably to be rung by the selective striking thereof as by a mallet or other ringing element. The instrument includes a control for selectively damping rung bells. The control may be foot pedal operated and may be arranged to damp selected groups of the bells of the tower. The bells may be supported on the tower stand to define octaves corresponding to the notes of a conventional piano keyboard. The respective octaves may be vertically related. The damping control may be biased to a damping disposition and selectively released by the user in the playing of the instrument.

Abstract: A rhythm pattern variation device which has an address counter for generating a memory read-out address signal in accordance with a rhythm clock, a memory for outputting a prestored rhythm pattern in accordance with the address signal, means for selectively branching the outputted rhythm pattern to two lines, a variation circuit for producing a rhythm pattern of a desired time lag from the rhythm pattern on one of the two line, and means for combining the rhythm pattern on the other line and the delayed rhythm pattern from the variation circuit into a composition rhythm.