Abstract: An electronic musical instrument is of a type in which tones are produced by a limited number of tone production channels which are efficiently used for a larger number of tones utilizing channel assignment technology. Normally, three of the channels are exclusively occupied for production of three tones to constitute a triad chord. But at time a bass tone is to be produced, the specific one of the three channels is compulsively used for production of the bass tone, giving up exclusivity for production of the chord tone. This eliminates the need of providing an additional channel for the bass tone production.

Abstract: Musical accompaniment is provided in different musical styles to the playing of an instrument, upon selection of one of the styles. A preferred tempo rate, or a range of acceptable tempo rates, are provided in response to selection of the musical style, causing the accompaniment to be sounded at or near a musically correct tempo in all cases. In one embodiment, a preferred tempo rate and a range of acceptable deviation from that rate are provided for each style, causing the accompaniment to be played at the preferred rate unless altered within the acceptable range by a performer.

Abstract: A plurality of channels for generating musical tones are provided in LSI chips. A CPU allots a performance mode selected by select switches to the channel or channels. The melody sounds or accompaniment allotted to the channels are generated by a time divisional processing under control of the CPU. The generated sounds are sounded through a loudspeaker, after being subjected to processing by a mixing circuit.

Abstract: A rhythm controller for producing a selected number of clock pulses for a musical beat interval comprising an oscillator, first and second counters coupled to the oscillator and a divider coupling the first counter to the oscillator to reduce the output frequency of the oscillator to the first counter. Input means generates a pulse at the onset of each beat interval and enables the first counter to count the divided output of the oscillator for a first beat interval. A comparator receives the count of the first counter, compares the count for the first beat interval with the count of the second counter and produces a clock pulse upon a coincidence. The clock pulse resets the second counter which continues to recount and to be reset after each coincidence until the end of a beat interval, thereby causing a selected number of clock pulses, i.e., a timebase, to be produced for the first beat interval.

Abstract: An automatic rhythm performing apparatus capable of simultaneously producing a plurality of rhythmic tones having the optimum volume relationship irrespective of the total volume of the rhythmic tones. A plurality of rhythmic tone signal generating devices generate a plurality of rhythmic tone signals corresponding respectively to a plurality of rhythmic musical instruments. A combining device combines the rhythmic tone signals to provide a combined output signal as an output of this apparatus, the level of which can be varied by a signal level varying device. There are provided a detecting device for detecting the level of the combined output signal and a controlling device for separately controlling respective signal levels of the rhythmic tone signals in accordance with the detected level of the combined output signal, thereby making the volume relationship of the plurality of the rhythmic tones optimum.

Abstract: An automatic rhythm performance device of an electronic musical instrument having an expression pedal is constructed of an operation amount detector, a rhythm selector, and a rhythm tone generator. The operation amount detector detects the operation amount of the expression pedal. The rhythm selector selects a rhythm to be performance among a plurality of rhythms. The rhythm tone generator generates rhythm tones which have rhythm patterns determined by the selected rhythm respectively, the number of rhythm tones to be sounded increasing automatically in proportion to the operation amount. This increment of rhythm tones further enriches a musical tone produced by manual performance whose volume is increased by the expression pedal operation.

Abstract: A musical tone forming system includes a waveform storage device for storing data representative of an attack portion of a musical tone waveform and data representative of part of the other portion of the musical tone waveform following the attack portion. An address device addresses the waveform storage device to first read the data representative of the attack portion and to then repeatedly read the part of the waveform from the waveform storage device to thereby form a musical tone signal. There is provided a device for generating data varying with time. The address device feeds an address data to the waveform storage device in accordance with the time-varying data to randomly designate as a starting address one of those addresses of the waveform storage device storing the data of the part of the waveform, thereby realizing a noisy nature characteristic of a percussion instrument.

Abstract: A system for automatically generating an accompaniment note pattern and a bass pattern programmed therein by the player. The system includes a programmable microprocessor wherein two patterns, one sounding in the frequency range of the solo and accompaniment manuals and the other in the frequency range of the pedals, can be programmed into a programmable and reprogrammable memory by the player by means of a separate keypad or one or two octaves of keys on the regular keyboards. The patterns are programmed in without regard to key, and on playback, the microprocessor is responsive to the chord being played at that time on the accompaniment manual to transpose the read out patterns to a compatible key. Means are provided for phase locking simultaneously occurring notes of the two patterns if they are of the same or octavely related frequencies. This is accomplished by causing both notes to be taken off the same divider string if a match of pitch occurs.

Abstract: An electronic musical instrument having a keyboard has a sound wave-shape generating circuit comprised of a pitch ROM connected to the keyboard. A first selector is connected to the keyboard, and a second selector is connected to the pitch ROM. A drum rhythm sound pitch data generating circuit and a pitch forming circuit are each connected to the first and second selectors. A wave-shape memory and a noise rhythm sound forming circuit are each connected to the pitch forming circuit. A third selector is connected to the wave-shape memory and the noise rhythm sound forming circuit. An envelope counter is connected to the third selector and the output of the envelope counter is fed to an audio amplifier. In use, a play/rhythm switching signal is selectively applied to the first, second and third selectors so that both a drum rhythm sound and a noise rhythm sound can be generated using only the one wave-shape memory.

Abstract: A timbre modulation circuit for an electronic musical instrument having an automatic rhythm accompaniment system. The timbre modulation circuit is provided in a musical scale tone signal path and includes a means for generating a control pulse series synchronized with an automatic rhythm sound generation timing and a variable timbre circuit responsive to the control pulse series whereby the timbre characteristics are caused to vary in response to the control pulse series thereby modulating the timbre of the musical scale tones.

Abstract: Frequency information is stored in a tone coefficient memory and accumulated to obtain address information for reading out a musical sound from a musical waveshape memory by a musical sound generating circuit. Envelope information is stored in an envelope coefficient memory and accumulated to obtain address information for reading out an envelope waveshape from an envelope memory by an envelope generating circuit. An address counter performs address assignment for operating the musical sound generating circuit and the envelope generating circuit on a time-divided basis. The frequency information and the envelope information are respectively accumulated by a common accumulator on the time-divided basis. Further, attack and decay coefficients are stored in the envelope memory by higher and lower order bits of the same address, respectively, and the contents of the higher and lower order bits are selectively read out.

Abstract: When a player plays a musical piece on a keyboard of a musical instrument, the instrument provides an event datum at every event of the key depression and key release. The event datum includes information on the time of such depression or release and information on the note pitch. Thus a sequential train of these event data constitutes performance data which represents the progression of the music actually played. According to a reference tempo clock, a barline datum indicative of the time for a barline is provided at every period of a time length which defines a measure.

Abstract: An automatic performance device is of a type in which the automatic performance is executed in accordance with musical data read out successively. It comprises a fast feed stop control circuit for advancing the progress of the automatic performance when an actual key depression timing is faster than an ideal key depression timing indicated by the read out musical data and for temporarily stopping the progress when the former delays behind the latter. Comparison between the actual key depression timing and the ideal key depression timing is made by comparing the content of a counter counting the tempo pulses which decides the tempo of the automatic performance with note-length information included in the musical data. It further comprises a tempo control circuit for changing a period of the tempo pulses based on a tempo of a performance made by the actual key depression.

Abstract: An electronic keyboard musical instrument is capable of inputting rhythmic patterns by setting desired rhythmic patterns in memory circuits using the keys of keyboards. The set rhythmic patterns operate a rhythm source circuit when read out from the memory circuits during performance and thereby output rhythm sounds.

Abstract: An electronic percussion synthesizer is disclosed which includes a plurality of pressure transducers, each representing a different percussive musical instrument. Each transducer is responsive to an external striking force for generating analog pulses, each pulse representing one beat of the respective musical instrument. The transducers are mounted to a synthesizer housing in a manner which mechanically isolates the transducers from each other. Each transducer is supported within a pair of housing portions by a resilient coupler maintained in compression between the interior surfaces of the housing portions.

Abstract: Electronic equipment having a tone generating function has a memory which stores rhythm patterns. Rhythm pattern data which is stored in the memory is sequentially read out by key-in operation at a key input section which selects a desired rhythm pattern. The number of depressing operations by a tempo setting key at the key input section is counted at a counter. The rhythm pattern data which is read out from the memory is set in a predetermined pattern. A control circuit controls the readout speed of the rhythm pattern data in accordance with the counting value of the counter.

Abstract: An automatic performance apparatus for use in combination with a manually operable musical tone generating instrument. The automatic performance apparatus includes a tempo signal generator, a reference timing signal generator, a tempo setting circuit and a tempo controller. The tempo controller measures the number of manual operations of the manual tone generating instrument in respective predetermined intervals before and after generation of the reference timing signal from the reference timing signal generator. The generation of the tempo signal from the tempo signal generator is controlled in accordance with the measured number obtained from the tempo controller, so that the tempo of the automatic performance is controlled.

Abstract: On a first keyboard (4) the time value of each musical note and/or the time value of each pause of the musical sequence to be reproduced is introduced. After the introduction of each note value, the respective pitch value of this note can be introduced with the aid of a second keyboard (50). The introduced sequence can include up to 8 measures and is reproduced repeatedly after actuating a start switch (11) on a visual display (13) and/or with an acoustic output (34) in a frequency which is selected with the help of a switch (20). The visual display (13) has (4) seven segments elements which show the sequence continuously, measure after measure. The acoustic output (34) can produce, at choice, white noise signals or sounds. The white noise signals have impulses which decrease exponentially from a maximum.

Abstract: An automatic rhythm performance device is constructed of a rhythm pattern memory, an instrument memory and a rhythm tone generator. The rhythm pattern memory delivers a variety of rhythm patterns corresponding to the selected rhythm. The instrument memory delivers instrument names of instruments to be performed corresponding to the selected rhythm too. The rhythm tone generator generates percussive instrument tones of the delivered instrument names at the timing designated by the corresponding rhythm patterns, respectively. In the above rhythm performance device, the selectable rhythms are grouped into some groups in advance. This grouping enables the instrument memory to be constructed of two stage memories. One stores group numbers identifying such groups, and the other stores the instrument names in every such group. The delivery of the instrument names is performed by addressing by the outputted group number to which the selected rhythm belongs.

Abstract: Bar codes representing rhythm data corresponding to rhythm pattern, rhythm progression or a certain kind of rhythm are printed in relation to a musical score, and are read out by scanning with a bar code reader. The rhythm data thus read out are stored in RAMs under the control of a CPU. The rhythm data stored in the RAMs are read out by the CPU and supplied through an amplifier to a loudspeaker, for producing sounds.

Abstract: A musical instrument comprises an input circuit for entering pitch information and duration information of a note, a counting circuit for counting the time when the input means continues to be actuated in order to fix the duration information, a memory circuit for storing the pitch information and the duration information, and an output circuit for actuating the memory circuit so as to develop the pitch information and the length information.

Abstract: In an electronic musical instrument, an apparatus and method are described for automatically generating arpeggios from selected chords while requiring only a minimum amount of performance sophistication and dexterity. In the preferred embodiment, a plurality of voice priority switches are included, each of which corresponds to a voice-related rhythmic pattern or an arpeggio variation of tones played. The desired variation of the voice-related rhythmic pattern of tones is implemented as selected notes are played. The played notes and corresponding notes in higher octaves are stored in a random access memory and subsequently accessed by a microprocessor which searches up or down in frequency to find the available notes in the random access memory. Subsequently, the microprocessor converts chosen notes to audible tones.

Abstract: An electronic musical instrument by which a performer can provide a musical accompaniment in different musical styles. The performer selects a desired musical style and plays on a standard keyboard in order to express a desired harmony. The instrument translates the keyboard playing into a chord type and root that defines the harmony expressed by the performer. A processor generates parameter signals defining a segment of music including a plurality of accompaniment notes arranged in the selected musical style and related harmonically to the selected chord type and root. Output circuitry converts the parameter signals to sound so that a performer of limited skill or musical knowledge can play an appropriately-styled accompaniment to a melody written in any one of a variety of musical keys.

Abstract: An automatic musical performance device follows in tempo a manual performance and is controllable to change the tempo of automatic performance independently of the tempo of manual performance. The automatic musical performance device comprises means for generating reference tempo data, means for generating tempo return instruction and tempo control means for controlling the tempo of automatic performance so as to usually follow up the tempo of manual performance and for controlling the tempo of automatic performance in accordance with the reference tempo when the tempo return instruction signal is generated. The reference tempo data and the tempo return instruction can be generated by either one of record means and manual set means.

Abstract: The present invention is a chord teaching system and method which assists the organist in learning musical chords. The system functions in several different modes and the various modes are selected by the learning organist. The chord teaching system enables the learning organist to select a chord without demonstrating any knowledge of the correct finger position on the keyboard of the organ necessary to play the chord. The system, depending upon the mode of operation, plays the chord selected and indicates to the learning organist the key corresponding to the root note of the selected chord or indicates to the organist the keys corresponding to the notes of the selected chord or enables the organist to depress the keys that the organist believes form the selected chord and indicates a correct response if the organist depresses the proper key and indicates the correct keys that form the notes of the chord if the response is incorrect.

Abstract: A percussion generator for an electronic musical instrument, such as an electronic organ, wherein the percussion generator is responsive to a time division multiplexed serial data stream produced by scanning the keys of the keyboard. A control pulse is produced each time that a new key on the keyboard is depressed, and this pulse, which has a duration equal to or greater than a plurality of scans of the keyboard, is employed to produce a burst of keydown pulses in the data stream. The percussion generator is responsive to the serial data stream and each of the aforementioned control pulses to produce keydown pulses in the appropriate time slots of the data stream in a plurality of successive sequences thereof and then terminate the keydown pulses even though the associated keys remain depressed.

Abstract: A synchronizing signal generator includes a tape recorder which is adapted to record click signals in response to actuations of a manual switch. Counting clock signals go on while the click recorded signals are reproduced, especially during a length of time extending from receipt of a particular one of the click signals to receipt of the next succeeding click signal. The resultant count is divided by a given numeral value and then the quotient is stored. The clock signals developing between the respective click signals are further counted during the course of reproduction of the click signals from the tape recorder and a pulse signal is delivered whenever the instantaneous count coincides with the stored quotient. Tempo clock signals are obtained through the division of the pulse signal at a selected division ratio out of a plurality of division ratios. The tempo clock signals are fed to a sequencer which in turn generates a control voltage and gate signals synchronous with the tempo clock signals.

Abstract: An electronic percussion synthesizer is disclosed which includes a plurality of pressure transducers, each representing a different percussive musical instrument. Each transducer is responsive to an external striking force for generating analog pulses, each pulse representing one beat of the respective musical instrument. The transducers are mounted to a synthesizer housing in a manner which mechanically isolates the transducers from each other. Sound signal generating circuits are provided which are responsive to the analog pulses for generating sound signals comprising the beat of the respective musical instrument. The amplitude of the signal representing each beat is proportional to the magnitude of the force used to generate the respective analog pulse. The synthesizer also includes storage and playback circuitry for digitally storing a series of pulses, each pulse representing a percussive beat; for playing back the stored pulses; and for storing additional pulses in an interleaving manner.

Abstract: A series of musical tone codes for musical performances and synchro start codes are stored in a main memory. A series of musical tone codes for one-key play or an automatic play are stored in a submemory. In the course of playing music on the basis of said musical tone codes read out from the main memory, when the synchro start code is read out, an automatic play on the basis of musical tone codes stored in the submemory is performed accompanied by the musical tone codes stored in the submemory under control of a CPU, if necessary.

Abstract: An electronic musical instrument includes first and second ROM's addressable for producing respective two-bar musical patterns representing independent automatic rhythm and music style features. Both ROM's are operable in response to a common clock signal to facilitate synchronous operation thereof regardless of the order in which the two features are played. In particular, the states of a rhythm counter clocked by the clock signal are decoded for generating a first control code tracking the extent of completion of the two-bar automatic rhythm pattern, the first control code being used to initialize start-up of the music style pattern during a performance of the automatic rhythm feature to insure completion of the two musical patterns in time coincidence. Upon start-up of the automatic rhythm feature during a performance of the music style pattern, a second control code is calculated to initiate the automatic rhythm pattern to insure time coincidental completion of the two musical patterns.

Abstract: An operator programmable rhythm variation system comprises a shift register for storing rhythm variation signals in a sequence specified by the operator. Variation select signals are generated by the operator of the musical instrument and provided to an input/output circuit which converts them to binary coded rhythm variation signals for storage in the shift register. The input/output circuit includes an output data latch, a visual display circuit and a gating circuit for gating the rhythm variation signals to the input of the shift register. The shift register is connected through a gate circuit such that data stored in the shift register can be rotated through the shift register for readout of stored rhythm variation sequences.

Abstract: A rhythm tone source which is provided with a noise generator composed of a plurality of shift registers which generate random pulses in synchronism with clock pulses supplied thereto, respectively, means for selecting the clock pulses to be applied to the shift registers, and means for controlling the input and output connections between the shift registers. The both means are changed over in combination with each other.

Abstract: An electronic circuit triggered by pulses derived from the rhythm pattern generator of an electronic organ simulates the sound of a group of people clapping hands by producing in bursts at least two different sound signals of differing characteristics and combining the signal bursts in a predetermined pattern which causes them to occur in close time proximity to each other but not at the same time. When the combined signal is acoustically reproduced, the resulting sound is simulative of that produced by a group of people clapping their hands in unison.

Abstract: In an automatic performing apparatus in which musical performance data are sequentially read out of a memory at time intervals corresponding to the durations of musical notes to thereby execute an automatic performance, a repeatedly played part is stored as subroutine data in the memory, together with main routine data, thereby to store much data in the memory having a limited capacity. The main routine data contains instruction data for calling the subroutine data and the subroutine data contains instruction data for the return to the main routine data. In response to a signal from a subroutine control circuit, the count of an address counter for designating an address in the memory jumps to an address of the subroutine data when the subroutine calling instruction data is read out, and jumps back to an address of the main routine data when the instruction data for the return to the main routine is read out.

Abstract: A chord performing apparatus for an electronic organ with a chord-former, comprises control inputs for control signals defining the chord tone, and control inputs for control signals defining the chord type and control units which can be preset in accordance with a pattern of chord tones and chord types to be played and outputs which are scanned and controlled in the rhythm of the melody for performing the same function as the switch elements, connected with the control inputs of the chord-former.

Abstract: Apparatus for eliminating feedback in stage monitors for selected musical instruments includes filter networks for attenuation of a broad frequency range including the entire range of frequencies contributing to the feedback. A combination of high order low-pass and high-pass filters is used to pass fundamental and second order components of a selected instrument, while attenuating the undesired feedback frequencies as well as extremely low range frequencies capable of damaging a speaker. A pair of passbands is provided, and a pair of frequency bands is suppressed, the two pairs providing alternate attenuation and pass-bands. Active filters having operational amplifiers and frequency selective circuits are used, along with buffering and summing circuits, to attain the desired frequency characteristic.

Abstract: A talking metronome is disclosed which is programmable to generate a human voice pattern of a sequence of numbers at a selected tempo (mm) and time signature (cadence) at one or more beat patterns. The time signatures are produced from quarter, eighth and sixteenth note beat patterns and all other varied combinations of beat patterns known to music. The voice pattern in the preferred embodiment is generated by synthesized speech.

Abstract: A keyboard operated electronic musical instrument is disclosed for imitating the strummed and solo modes of playing plucked fretted musical instruments. The actuated keys do not directly control the set of tone generators, but are used to automatically select one of a library of chord types which is closest to the actuated keys. A root note is chosen for each selected chord type. The selected chord type is transposed to an open chord spanning the several octaves associated with a guitar-type instrument. The selected tone generators assigned to the transposed open chord are strum keyed in sequence at a rate adaptive to the speed in which successive chords are entered on the keyboard. Provision is made for up-down strumming and to automatically enter a solo tone mode when a sequence of single notes are entered on the keyboard.

Abstract: An automatic electronic musical instrument generates structured and pleasing musical sound patterns from a random sequence. One phase of the random sequence is supplied to a first shift register. A first plurality of outputs from the first shift register is used to control a rhythm oscillator. A second plurality of outputs from the first shift register is used to control a pitch oscillator. A second shift register receives a second phase of the random sequence and the rhythm signal produced by the rhythm oscillator. A programmed control input provides a song structure to the outputs of the second shift register. The outputs of the second shift register are supplied as inputs to a musical frequency generating means which has the capability of transforming dissonant frequency combinations otherwise selected by those inputs to compatible frequency combinations. The musical frequency generating means also receives the pitch signal from the pitch oscillator.

Abstract: A system for use in electronic organs and electronically actuated organs wherein a pattern of notes sounding as if played on the accompaniment or solo manual are played from the pedalboard. The pedalboard is encoded such that depression of a pedal will generate an encoded binary word corresponding to a chord having as its root the note corresponding to the depressed pedal. Individual notes of the chord are played in a rhythmic sequence at a rate determined by the rhythm generator of the organ and in a pattern which can be selected by the organist. As the pattern is being automatically played, the organist is free to manually play a melody on the solo manual and accompaniment chords on the accompaniment manual. The pattern is changed from a major key to a minor key having the same root note by actuating a knee paddle.

Abstract: The present invention provides a system in an electronic musical instrument for measuring the setting of a variable resistor for controlling tempo, displaying the tempo to which the setting corresponds, and controlling the tempo so that notes are sounded in accordance with the setting measured and displayed. The tempo control comprises a tempo potentiometer that is self-calibrating by means of a microprocessor which automatically measures the resistance of both the current setting of the tempo potentiometer and the maximum setting of the potentiometer so as to maintain the desired correspondence between the mechanical position of the tempo potentiometer and the tempo selected. A non-linear relationship is introduced between the mechanical position of the tempo potentiometer and the tempo selected in order to maintain a desirable correspondence between the mechanical position of the tempo potentiometer and the tempo selected.

Abstract: A central processor for an electronic organ in the form of a single, forty pin integrated circuit chip employing multiplexed technology and trinary and tri-level inputs to obtain maximum usage from each pin. The solo manual keys, chord keys, rhythm pattern switches and other control functions are multiplexed externally of the chip, fed into the chip as a time division multiplexed four bit byte over four pins, and demultiplexed internally of the chip. The solo manual information is multiplexed internally of the chip to form a single serial data stream, is combined with solo fill note data generated within the chip and then brought out over a single pin for external demultiplexing. The twelve tones of a musical octave are brought into the chip over twelve pins together with various static control signals, are decoded by tri-level decoders internally of the chip, and then utilized to generate the tones of the chords, also internally of the chip.

Abstract: An automatic rhythm performance device is of a type in which an intro performance which is in a rhythm pattern different from a rhythm pattern of main performance to be performed amidst music progression is automatically provided at the start of an automatic rhythm performance. To provide the intro performance, this device has a memory for storing special rhythm patterns in addition to regular rhythm patterns for main performance. At the start of the automatic rhythm performance, this memory is made operable for a predetermined time period so that the intro performance is executed on the basis of intro pattern pulses read out from the memory. The intro performance is inhibited when "synchro start mode" which starts the automatic rhythm performance in synchronism with key depression is being selected.

Abstract: A musical instrument combination including a rocket engine type combustion chamber and a system for firing it either by single drum beat control or by variable frequency control pulses. The effect achieved by the rocket engine output sound is similar to that of a pipe organ and resonator and further is of a pitch controllable by the barrel length and diameter of the rocket engine chamber exhaust structure.

Abstract: The invention relates to a device for the acoustic indication of the beats of a musical time in which the tempo at which the beats are reproduced is adjustable. According to the invention means are provided for varying the musical properties of the separate beats, e.g. the reproducing period, the volume and the pitch, said varying means being provided with N switch elements each having at least three switch settings, and a scanning element for the cyclic consecutive scanning of the N switch elements, wherein a tone is generated in a first channel during the scan period of each of the switch elements in the second switch setting of the switch element, while a tone is generated in a second channel in the third switch setting of the switch element and no tone is generated in the first switch setting of the switch element in either channel, both channels being common to the N switch elements.

Abstract: An automatic accompaniment circuit which is provided with a code detector for scanning key switches to detect the code of a depressed one of the key switches, a latch circuit for latching the output signal of the code detector by a bar clock pulse which is produced for each bar, a comparator for comparing the output signals of the code detector and the latch circuit to yield a coincidence signal, and control means for counting the coincidence signal from the comparator by a desired number of bars using the bar clock pulses and then providing a command signal for changing the pattern of an automatic accompaniment.

Abstract: An electronic music book for simplifying the storage and retrieval of musical scores in which a control panel operates electronic memories to locate a song in the memory for a musician's reading thereof. Optional modules may be added to the memory to expand the lilbrary of songs stored by the book. A variety of additional features may be included in the music book, such as audio playback of a selected song, tempo and rhythm control, and a temporary memory for musical works entered through a musical keyboard in the control panel. The book is adapted to be attached to a music stand and may be battery operated for portable use or permanently connected to a source of A.C. voltage.

Abstract: A tempo control device for automatic performance according to this invention is of a type wherein a tempo of automatic performance is caused to automatically follow that of manual performance as the latter changes during performance. When difference in tempo between manual and automatic performance falls within a predetermined range, this automatic follow-up control is performed by measuring the manual performance tempo with accuracy and by controlling the frequency of tempo clock pulses in the automatic performance on the basis of the value thus measured. The predetermined range may be one fixed range for all notes of various note-lengths, or alternatively, different ranges may be employed in accordance with the length of notes.

Abstract: An electronic musical instrument comprises a keyboard, a tone signal forming circuit to produce musical tone signals corresponding to keys being depressed on the keyboard, a memory to store musical performance data, a keyboard display device to visually instruct a pupil or trainee as to which keys are to be depressed on the keyboard in accordance with the performance data read out of the memory so that the pupil or trainee may effect a musical performance on the keyboard while following key indications, and an automatic musical performance device to effect an automatic musical performance of different type from the musical performance effected on the keyboard. The pupil or trainee may selectively effect the musical performance on the keyboard with or as the accompaniment by or for the automatic musical performance.

Abstract: An automatic rhythm accompaniment system comprises memory units storing a plurality of rhythm patterns and a designating switch for selecting a desired rhythm pattern. A memory unit is further contained in the system for previously storing chord progress data and further storing control data to fill in an ad-lib rhythm. Therefore, the rhythm accompaniment system may perform the ad-lib rhythm in place of the rhythm pattern by the switch designation for each measure. Additionally, the accompaniment based on the chord progress data may also be performed automatically.