Kabushiki Kaisha Kawai Gakki Seisakusho

Kawai Musical Instruments Mfg. Co., Ltd.

Kawai Musical Instruments Manufacturing Co., Ltd.

Yasushi Sato

Gen Izumisawa

Akiko Komatsu

Mineo Kitamura

Junichi Takano

Toru Aoyama

Fumiaki Ohta

Atsushi Noguchi

Satoshi Fujimoto

A plurality of instructions to be executed in an order of being issued without an appointment of a waiting time or a starting moment are designed to be executed after a certain waiting time; instructions to be executed in an order of being issued without designation of starting moment or waiting time are provided with starting moment or waiting time information so that the instructions can be executed in an order designated by the time information.

Apparatus, method and computer program for processing instruction

An electronic musical sound generator prevents a sound production sequence to be stopped from continuing to be produced even through the key is released. Even if an erroneous instruction is sent to prevent identification data from being compared, in other words, if a sound production sequence which should be stopped, continues to be produced because of failure to find the sound production sequence to be stopped, the production of the musical sound can be stopped due to the key release because a second decision block searches data in a storage block, regards a key having identification data different from the one sent as the released key, according to the sequence being produced and the key is number, and determines the sound production sequence to be stopped.

Electronic musical sound generator

The component tone signal commonly shared by a plurality of keys does not turn to a release signal if one of the keys is released to stop a tone and also while tones of other keys are sustained; the on-data of each key of the keyboard is multiplied in multiplier by the amplitude data set by the draw-bar circuit with the multipliers, added with adder and sent to the sound source circuit; the sine waves of the same waveform and different cycles are generated according to the amplitude data, are synthesized with envelopes from envelope generator, and the added with adder; this envelope generator is disposed at every sound source circuit, that is, every one of the common component tone signals; the component tone signal/sine wave commonly shared by a plurality of keys does not turn to direct to a release state if one of the keys is operated to stop a tone, and also directs not to turn to a release state but to maintain a sustain state while tones of the other keys are sustained.

Component tone synthetic apparatus and method a computer program for synthesizing component tone

In an electronic musical instrument, playing data are produced by depressing a key in a keyboard, and divided into plural groups. At least one of the semi-automatic playing channels processes sound data of a musical piece read out of a memory to generate musical tones in synchronism with the playing data of at least one group. The sound data may be corrected according to sound correcting data before being used to generate musical tones.

Electronic musical instrument with semi-automatic playing function

An electronic musical instrument according to the present invention has oscillators for generating a tone waveform; a modulator for modulating a musical tone; a modulation controller for determining a degree of modulation to be performed by the modulator; and a central control unit for controlling the oscillators, the modulator and the modulation controller. A memory stores a current control value of the modulation controller, and an input/output device reads a control value stored in the memory, by the central controller, and/or writes a control value stored in the memory into the central controller to ensure the control of the degree of modulation and the alteration of frequency bands.

Multiple oscillator electronic musical instrument having a reduced

Timbre control apparatus, for an electronic musical instrument that, in response to a tone-ON command, reads timbre data from storage memory where a plurality of timbre data to be employed have previously been stored, and produces musical tones in consonance with the timbre data. The timbre control apparatus has a first storage memory for storing first timbre data common to all tone ranges; a second storage memory for storing second timbre data inherent to specific tone ranges; a calculation circuit for, in response to a tone-ON command, performing a predetermined calculation employing the first timbre data read from the first storage memory and the second timbre data read from the second storage memory; and tone production circuit for producing a musical tone having a predetermined timbre in consonance with data calculated by the calculation circuit.

Timbre control apparatus for an electronic musical instrument

A key assigner, for an electronic musical instrument that has a plurality of oscillators and that employs for the production of a specific timbre only the number of oscillators that is actually required. The key assigner comprises a control for, upon reception of a tone-ON command, assigning timbre generation to the oscillators by control unit, each of which includes the maximum number of oscillators required for timbre generation. Once timbre generation assignments to all the control units have been effected, and a tone-ON command for a timbre that requires fewer oscillators than compose each of the control units is received, the key assignor assigns the timbre generation to an oscillator, of one of the control units, to which timbre generation assignment has not previously been made.

Key assigner for an electronic musical instrument

A tone generating apparatus that employs a read-out system comprises a waveform memory wherein are stored, as waveform data for a transient portion, waveform data that have a weighted attenuation characteristic and that are stored at a predetermined interval within a stationary portion following a rising portion of the musical tone, and waveform data that are obtained by extracting and linking multiple sets of the waveform data at the predetermined interval within a stationary portion, by filtering the resultant waveform data by employing a filtering process that does not alter phase information, by extracting from filtered waveform data waveform data for an interval equivalent to the predetermined interval, by linking together the extracted waveform data in numbers equivalent to the number of waveforms included in the predetermined interval, and by weighting the resultant waveform data with a rising characteristic; and wherein are further stored, as waveform data for a repetitive portion, the filtered waveform data.

Tone generating apparatus producing smoothly linked waveforms

A tone generating apparatus comprises a wave memory for consecutively storing first tone wave data acquired by performing pulse code modulation on a tone waveform in a first predetermined interval starting at an attack of a musical tone, second tone wave data provided by adding that tone wave data which is obtained by performing pulse code modulation on a tone waveform in a second predetermined interval following the first predetermined interval and is then weighted with a fade-out characteristic and that tone wave data which is acquired by synthesizing waveform components of a tone waveform in a third predetermined interval following the second predetermined interval and is then weighted with a face in-characteristic after being linked for the second predetermined interval, and third tone wave data produced by synthesizing waveform components of a tone waveform in a third predetermined interval following the second predetermined interval based on a characteristic of the tone waveform in the third predetermined interval. The first tone wave data, the second tone wave data and the third tone wave data are read out once in the named order from the wave memory, and then the third tone wave data is repeatedly read out, thereby generating a tone signal.

Tone generating apparatus utilizing preprogrammed fade-in and fade-out

A tone generating apparatus comprising a first tone signal generator including the same number of oscillators as a polyphonic number each for generating a tone signal of that tone component of tone components constituting a musical tone which has a relatively long tone-ON time; a first assigner for assigning tone generation to one of the oscillators of the first tone signal generator; a second tone signal generator including oscillators each for generating a tone signal of a different one of the tone components constituting a musical tone than the tone component having a relatively long tone-ON time, a quantity of the oscillators being less than the polyphonic number; and a second assigner for assigning tone generation to one of the oscillators of the second tone signal generator, whereby when a tone generation is specified, a tone signal output from one of the oscillators of the first tone signal generator assigned by the first assigner and a tone signal output from one of the oscillators of the second tone signal generator assigned by the second assigner are synthesized to produce a tone signal.

Tone signal generation from fewer circuits

A musical tone data compensation apparatus which detects chord components in a performance data stored in accordance with operation of a keyboard and modifies touch data of each tone composing a chord. New touch data are generated by compression or expansion of each difference in touch data with referring to a representative touch data in a block of chord tones, so that emphasis or smoothness is given to a sequence of chords.

Musical tone data compensation apparatus

A fluctuation generator for use in an electronic musical instrument comprises uniform random generator for generating a random number having a uniform probability distribution, and a function circuit, which receives the random number from the uniform random generator and produces a random number MOD having a probability distribution according to a predetermined function. The function circuit may be constituted by a ROM. The fluctuation generator generates a tone signal in accordance with the random number MOD from the function circuit. According to this fluctuation generator, the uniform random generator generates a random number having a uniform probability distribution, and sends it to the function circuit. The function circuit generates a random number in accordance with a function having a predetermined input/output characteristic to thereby generate a random number having a probability distribution close to the natural distribution (for example, a random number with the normalized distribution). A tone signal will be generated in accordance with this random number (for example, by adding the random number to a wave read frequency). A musical tone generated based on this tone signal should have fluctuation closer to the natural one.

Fluctuation generator for use in electronic musical instrument

A method for processing a waveform includes the steps of dividing an original musical tone into head data, mix data, and loop data. The data is subjected to several processing steps, including cross-fade mixing. All processing steps are carried out before the processed waveform is stored in memory. Therefore, when the stored data is read out to reproduce the original musical tone, no interpolation steps are required to link the head, mix, and loop data together because that data has been smoothly linked together prior to storage in the memory. As each musical tone is read out, the head data is read out first, followed by the mix data, and then the loop data is read out in alternating directions. The smoothly linked head, mix, and loop portions of the musical tone provide a pleasing reproduction of the original musical tone.

Method for processing a waveform

A tone generating apparatus is provided with the same number of tone signal generating circuits as a polyphonic number, each of which generate multiple tone-component signals having a relatively long tone-ON time and combine the signals to produce a tone signal, and is also provided with the same number of tone signal generating circuits as a predetermined number smaller than the polyphonic number, the latter circuits each generating a tone-component signal having a relatively short tone-ON time. With this arrangement, when tone generation is specified by depression of a key, for example, generation of a musical tone having a relatively long tone-ON time is assigned to one of the former tone signal generating circuits, and, at the same time, generation of a musical tone having a relatively short tone-ON time is assigned to one of the latter tone signal generating circuits, thereby generating a single tone signal.

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Hamamatsu, Japan

Yasushi Sato