Abstract: An audio frequency generating device includes a storage unit, a selecting unit, a processing unit, a first speaker and a second speaker. The storage unit stores at least one chord and each chord includes N fundamental frequencies. The selecting unit is electrically connected to the storage unit. The selecting unit selects M fundamental frequencies from the N fundamental frequencies of at least one of the at least one chord. The processing unit is electrically connected to the selecting unit. The processing unit uses the M fundamental frequencies to generate a first audio frequency. The processing unit uses a frequency difference to adjust each of the M fundamental frequencies to generate a second audio frequency. The first speaker is electrically connected to the processing unit and outputs the first audio frequency. The second speaker is electrically connected to the processing unit and outputs the second audio frequency.

Abstract: A signal generator for a musical instrument includes a voltage-controlled oscillator (VCO) comprising a control voltage input and a VCO output. The control voltage input controls a frequency of the VCO output. A controller is configured to control the voltage-controlled oscillator by inputting a sequence of analog control voltages from a plurality of preloaded control voltage inputs.

Abstract: A sound reproduction system (10) is disclosed in which a sound barrier (14) defines a horn passageway having an upstream (22) and a downstream section (24). A driver (12) is mounted at the throat (16) of the upstream section (22) so that its rearward directed output communicates with the downstream section (24). Output from the upstream section and the rearward directed output of the driver are merged at a tap point located at the beginning of the downstream section. By altering the respective areas and lengths of the upstream and downstream sections a variety of different frequency dependent responses are obtained. In one example, low-frequency response systems of heretofore unobtainable compact size are realized.

Abstract: A loudspeaker includes a toroidal shaped housing and at least one driver positioned within the housing. The driver is mounted within an arcuate enclosure such that a forward portion of the driver transmits sound beyond the enclosure and the rearward portion of the driver is substantially confined within the enclosure.

Abstract: A method for handling with polyphony limits in an electronic organ, that is provided with at least one keyboard, one pedalboard, a series of organ stops, which can be turned on by a user to determine which voices are assigned to each key and to each pedal, and with a sound module, which is provided with a number of independent sound generators; when a user turns on a number of organ stops exceeding a maximum number depending on the number of independent sound generators, some organ stops are automatically turned off according to a pre-determined selection rule, in order to have a number of really operating stops that does not exceed the mentioned maximum number.

Abstract: Apparatus to widely change the control amount used for of mixing control in an audio mixer and to momentarily change a knob to a desired setting can be reproduced by selecting a mode in which the control amount for controlling the mixing of audio signals is continuously output and a mode in which the temporarily the stored control amount is output.

Abstract: A preselector for a musical instrument includes a memory that stores data for controlling sound parameters emitted by the musical instrument when read from memory in response to actuation of a finger or pedal bar switch. For each independent parameter to be controlled, there is a set of lighted momentary push-button switches that determines the magnitude of that parameter. These values are written into the memory during a first mode at an address determined by the number of depressions of any actuating bar, such as a finger bar or toe bar. The lights behind the switches indicate the magnitude of the parameter. Alternatively, a variable potential converted to a digital signal by an analog-to-digital converter can be used to define the magnitude of the parameter. Just before performance after the values of all the parameters have been written into the memory in the sequence in which they are to be used, an address counter is reset to its initial value.

Abstract: An electronic musical instrument comprises a plurality of keyboards each having a plurality of keys, a control circuit for controlling a manner of tone production, and a musical tone production circuit responsive to respective depressed keys of respective keyboards. The control circuit controls the musical tone production circuit in response to operation of a switch mounted on a control panel for manually selecting one of a plurality of sets of preset parameters corresponding to a kind of a musical tone to be performed. The musical tone production circuit modifies a tone specified by a depressed key in any keyboard according to the selected switch on the control panel.

Abstract: An operating member control device of an electronic musical instrument is constructed by a main unit and a plurality of subunits, each of which has a operating member for setting a musical tone element and a drive mechanism for moving the operating member. The main unit transmits in serial form a set of control data signals, which are preset in advance, designating desired target positions of the operating members respectively. The subunits further include serial to parallel converters, each of which receives the control data signals and serial-to-parallel converts the corresponding one of the control data signals. The operating members are moved from the current positions to the desired positions designated by the parallel converted control data signals respectively. By the construction as above, this operating member control device need a single line only with respect to the connection of the main unit and the subunits basically, thereby enabling simple wiring.

Abstract: A play data detecting system for an electronic musical instrument in which in the case of multiplexing together and scanning note select signals from key switches and function select signals from tablet switches and analog volumes, these signals are divided into a plurality of scan blocks of different scan periods. For the tablet switches, a processing routine is executed twice in one cycle of a main routine in view of a required number of scan addresses and, for the analog volumes, the results of parallel processing are used once in one cycle. This permits high-speed processing of the key switches and low-speed processing of the tablet switches and the analog volumes with sampling periods fit for them, respectively.

Abstract: An electronic musical instrument has internal memories for storing various panel data and a detachable present circuit having external memories of high-speed operation for storing panel data equivalent to those of the internal memories, by which panel data can be set from the outside. An advanced player can adjust and set a wide variety of tone variations through using various panel data by the external preset circuit, and a beginner who does not require such various tone variations can set panel data by the internal memories alone.

Abstract: Various types of information utilized for performance of an electronic musical instrument are stored in first and second memories. The information stored in the first memory represents parameters, as a preset data set, which determine a characteristic of a musical tone to be produced. The information stored in the second memory is auxiliary data representing information other than the parameters such as performance messages. The auxiliary data used in combination with the preset data set are stored in the second memory through auxiliary data input means, such as keys of the electronic musical instrument, and are read out of the second memory to be displayed on the display means.

Abstract: The present invention is an electronic piano that includes various "easy play" features that enable a person with little musical training to play the piano producing music similar to that of a skilled musician. The "easy play" feature automatically creates musical and rhythmic piano accompaniment patterns in response to playing either one key (One Finger Chord mode) or a chord (Funchords mode) with the left hand. The player plays the melody of the desired tune with the right hand. Instead of having to move the fingers of the left hand to play complex piano accompaniment patterns, as with a conventional piano, the player only needs to play a note or chord, and move the finger or fingers of the left hand to a different playing key or keys to change chords and patterns. In the standard piano mode, this instrument resembles an acoustic piano in function. The invention also includes a set of pushbutton switches which control the "easy play" features of the instrument.

Abstract: A tone generating system for an organ comprises a first group of tone generators for producing notes of a first chromatic scale and second group of tone generators for producing notes of a second chromatic scale, slightly offset from the first. The tone generators are addressed via a microprocessor in response to keyboard input, wherein the fundamental and a first plurality of selected harmonic components of a given note are generated by respective tone generators of said first group, and the remaining harmonics are provided by generators of the second group. Harmonic amplitude coefficients for particular organ waveforms are stored in random access memory and are subject to change according to stop inputs coupled to the microprocessor.

Abstract: A pipe organ in which information relevant to actuation of keys and stops at a console of the organ is stored in random access memory, and the specifications for stops are held in pre-programmed read only memory, the requirements for each pipe being examined in turn by scanning means.

Abstract: A blind capture system for organs and other electronically actuated musical instruments enabling the setting of control switches, such as voicing tabs or keys of the keyboard, to be stored for reactivation upon command. The system includes a programmable, random access memory capable of storing data representative of the composite states of the switches and includes a plurality of storage frames in which data corresponding to a plurality of separate combinations of actuated switches can be stored. The switches are scanned by a multiplexer to produce a time division multiplexed serial data stream, which is then loaded into the memory during the store mode in such a manner that the data will be entered into the proper storage frame. The data is read out of the memory as a serial data stream, which is demultiplexed to produce a parallel format signal which is connected to the control inputs for the system controlled by the switches over a bidirectional data bus.

Abstract: A tone quality presetting apparatus for use in an electronic musical instrument, arranged so that, when preset data of tone quality pattern are recalled from a memory to automatically set contents on tone quality setting members of manually operable setting units so as to establish agreement of the contents with the read-out preset data, the tone generator section of the musical instrument is controlled by the contents of the preset data during the period of time till the contents set on the setting members come to agree with the contents of the preset data, and that subsequent to the establishment of this agreement, the tone generator section is directly controlled by the contents set on the setting members, whereby the automatic setting operation of the setting members does not need to be performed at high speed and also the player is not bothered to pay attention to noises which otherwise would be generated in the setting members during automatic setting of contents thereon, and further that, during the pa

Abstract: An electronic organ circuit includes a multiplicity of keyers receiving control inputs from plural shift and store registers capable of operating any given keyer at different levels. The inputs for a given keyer are applied on a cyclic basis and for differing time periods in such manner that the keyer's output amplitude and waveshape vary in response to the number and duration of inputs. A processor responsive to keyboard key and stop actuation supplies information to shift register chains corresponding bit-wise to the operation of keyboard keys, and corresponding, in respect to bits destined for a given register, to the condition of organ stops. Individual registers are then operated on a duty cycle basis and provide outputs of selected duration for effecting different stop sounds.

Abstract: A non-volatile memory system for an electronic musical instrument having a plurality of player actuatable instrument controls, comprises a readable, writable memory. The memory includes addressing inputs and data input/outputs. The data input/outputs are coupled with at least selected ones of the plurality of player actuatable instrument controls. Player actuatable memory controls are also provided for selecting either the memory or the selected ones of the player actuatable instrument controls for control of the instrument.

Abstract: In an electronic musical instrument, a tone property setting device is provided in association with a musical tone forming circuit. The device delivers analog signals designating properties of the musical tone signals to be produced, which analog signals are converted into time division multiplexed digital signals, then processed through memories, converted back into analog signals, and are applied to the musical tone forming circuit, thereby to determine the tone properties. Digital processing utilizing the memory facilitates a variety of control.

Abstract: There is disclosed an actuator for the selector hooks of the capture type combination system used in mechanical or electro-pneumatic organs. All the selector hooks which have been shifted to operating position are simultaneously pulled down by a mechanism actuated by a crank system driven by an electric motor.

Abstract: An electronic musical instrument includes a programmed microprocessor for controlling selected functions of the instrument and a plurality of key and tab switches responsive to a scan control signal repetitively scanning the switches for developing a serial data signal defining operated key and tab switches during each of the scans. An interface circuit is interposed between the key and tab switches and the microprocessor for developing the scan control signal and for receiving the resulting serial data signal. The serial interface circuit includes means for converting the received serial data into a number of first multibit words each representing a depressed key and a number of second multibit words each bit of which represents the operational condition of a respective one of the tab switches.

Abstract: The present invention relates to economically fabricated means for the generation and processing, member selection, and acoustic radiation of pluralities of individual tone currents originating from at least one high frequency source and formed by note-information temporarily transferred through key depression, from permanent electronic memories to temporary memories in small numbers of standard tone units, in precise duplication of properties of pipe organ sound.There is described an electronic transfer organ for duplicating twenty-six known properties of pipe organ sound. The illustrative, inventive instrument employs completely standardized circuitry except for automatically programmable memories for each organ voice, which contain all the information required to form, switch and variously decouple all the notes in that voice.

Abstract: A blind capture system for organs and other electronically actuated musical instruments enabling the setting of control switches, such as voicing tabs or keys of the keyboard, to be stored for reactivation upon command. The system includes a programmable, random access memory capable of storing data representative of the composite states of the switches and includes a plurality of storage frames in which data corresponding to a plurality of separate combinations of actuated switches can be stored. The switches are scanned by a multiplexer to produce a time division multiplexed serial data stream, which is then loaded into the memory during the store mode in such a manner that the data will be entered into the proper storage frame. The data is read out of the memory as a serial data stream, which is demultiplexed to produce a parallel format signal which is connected to the control inputs for the system controlled by the switches over a bidirectional data bus.

Abstract: A microprocessor controlled electronic capture combination action system for use in an electronic organ for selecting a predetermined combination of stops to define the organ voicing. The system includes a plurality of stop tabs for setting and resetting the stops, a plurality of pistons for setting a desired combination of stops to a predetermined condition, a random access memory for storing data associated with a selected combination of stops, a read only memory containing a permanently stored operating program incorporating a plurality of operating instructions, an indicator light associated with each of the stop tabs and a microprocessor responsive to the operating instructions. The stop tab and pistons are continually and sequentially scanned to detect the contact closures. Actuated stop tabs cause the associated stops to be selected and the indicator lights illuminated.

Abstract: An electronic musical keyboard instrument that is controlled by a digital processor. Key and stops/effects statuses are sampled, during successive time intervals, and read into random access memory associated with the digital processor. After manipulation and/or supplementation of the status information to effect implementation of various features, key-representative signals are read out to tone generation and voicing circuits.

Abstract: Apparatus for sequencing an electronic organ through a plurality of different combinations of tone settings utilizes an addressable memory to store each setting combination as a separate addressable word in which each bit of the word indicates the setting of one tone characteristic. The words are read out in predetermined sequence at times controlled by the musician, the bits of each word controlling the immediate setting of all the tone control switches. Any word in memory can be read out at any time on command of the musician independently of the sequencing to establish a selected preset status of the tone control switches. The automatic setting of any tone control switch can be manually overridden at any time and the corresponding bit in associated control word in memory changed accordingly.

Abstract: An electronic musical instrument, such as a pipe organ, has a multiplicity of manually and electrically positionable knobs for selecting and restoring respective organ stops, any combination of signals representing selected and unselected stops being recordable in a nonvolatile memory from which that combination can be subsequently read out under the control of a keyboard and a set of pushbuttons. Whenever a new signal combination is called forth from the memory, switching instructions are loaded into a multiplicity of cascaded register stages whose outputs are connected via respective interface circuits to selecting or restoring coils of respective knobs. The interface circuits are unblocked simultaneously by a transfer instruction from the memory to establish the new knob positions.

Abstract: A computerized unit organ relay which utilizes computer hardware and software to interconnect the pipes of the organ with the organ console in such a fashion that the proper pipes are activated in response to the key-stop combinations designated at the console. All of the keys of the various keyboards, and their associated stops, are connected through appropriate input ports to the data processing device which, in a preferred form, comprises a programmed microcomputer. The computer software acts on the input data from the keys and stops to calculate which of the pipes should be activated in response to actuated keys and stops. This information is stored in a continuously updated array and is read out of the computer memory, via appropriate output interface devices, to activate the corresponding pipes of the organ.

Abstract: An organ stop switching system includes a plurality of stop switches and a random access memory within which combinations of stop switch settings are stored. The stop switch settings are multiplexed into a memory loop having a capacity fractionally smaller than the random access memory. This loop is used for an input and an output circuit for the random access memory during time slots corresponding to numbered pistons selected for storing and recalling stop setting combinations. A serial-to-parallel converter receives information from the memory loop and provides outputs for operating stop control circuitry of the organ.

Abstract: A solid state electronic relay system for a pipe organ having at least one input register connected to one or more organ manuals, respectively, to receive parallel input signals therefrom, and respectively convert same into a time based serial digital signal wherein each note of the keyboard occupies a particular interval of time in the digital signal. The serialized signal of an input register propagates through a digital delay line at a predetermined clock frequency. Selected ones of the delayed digital signals provided thereby are tapped to derive octave and mutation pitch signals. Accessory circuits receive the serialized digital signals and using combinational and sequential digital techniques modify the digital signals to provide reiteration, pizzicato, sostenuto and the like effects. The tapped signals and modified signals are selectively combined with logical gates under the control of the organ "stops" to provide the unification and accessory functions.

Abstract: A non-volatile programmable memory storage system for use with electronic musical instruments is provided which utilizes an erasable and reprogrammable read only memory (EPROM). The EPROM is provided with suitable erasure means, either electrical or ultraviolet light. Also provided is means for entering and retrieving data from the EPROM and means for bidirectionally transferring data between the EPROM and the electronic musical instrument.

Abstract: The present system is a capture action system for electronically recording stop tab configurations in an electric organ, and for recalling the stop tab configurations at will, by depressing of a single control piston for each desired configuration of stop tabs. The system includes provision for setting and recalling combinations of stop tabs associated with a single division of the organ, for example, the swell manual, but not affecting tabs in other divisions, and also includes provision for recording and recalling combinations of all tabs on the organ (general stop) without regard to division. The system further includes a divisional or general cancel function, for operated tab switches, resetting these to inoperative position, and reversible stop functions in which a control piston when actuated reverses the position of its associated stop tab, the reversible stops retaining their abilities to function within the divisional and general combinations.