Nippon Gakki Seizo Kabushiki Kaisha

Akinori Endo

Hirokazu Kato

Hirokazu Katoh

Yasunori Mochida

Takamichi Sawase

An automatic playing musical instrument is provided in which the amount of storage medium to be used is substantially decreased. The automatic playing musical instrument is provided with a key information generating circuit for generating key information corresponding to a depressed key among the plurality of keys. A change of the key information is then detected, and a time interval between one of the change and the other which follows immediately after the one of the change is measured so as to generate a time period data representative of the time interval. Each time the change is detected, a musical performance data comprising the key information and the time period is stored in the storage medium, while on the other hand if the change is not detected, no musical performance data is stored thereby saving the amount of the storage medium to be used. The musical performance data stored in the storage medium is reproduced by supplying it to a driving circuit which drives the corresponding key in accordance with the musical performance data.

Automatic playing musical instrument

An electronic musical instrument of a channel assignment type wherein depressed keys from among a larger plurality of keys are respectively assigned to a smaller plurality of tone producing channels for generating wave of musical tones. The assigner comprises a microprogram, an arithmetic section, a memory, and an interruption control circuit to assign the depressed keys to available tone producing channels. The current on-off information of the keys is subjected to calculation to form a key-on request file and a key-off request file. A tone request file is formed on a plurality of tone data as designated by the tone levers. A channel assignment table is formed, based on the key-on and key-off request files, to indicate a status of assigning the depressed keys to the tone producing channels. The channel assignment table is stored in the memory and the contents thereof are supplied to the wave generator, whereby a plurality of musical tones are generated simultaneously by the wave generator as controlled by the microprogram.

Assigner for electronic musical instrument

In a wave generator for an electronic musical instrument, a plurality of sampling values of a musical tone waveform having a given envelope are simultaneously carried out in a time division system according to the musical tone waveform calculation sequence which can be varied as required; more specifically, calculation for generating a musical tone waveform is carried out while advancing phase, the envelope given to the musical tone waveform is divided into plural segments whose time intervals can be changed as desired, and phase increment values are set for the segments thus obtained while increment values are set for the phase increment values, respectively, these values being accumulated to carry out the calculation of the musical tone waveform, whereby the musical tone waveform and its envelope are varied intricately to produce musical tones rich in natural feeling.

Wave generator for electronic musical instrument

An automatic performance system in an electronic musical instrument comprises circuits for forming digital performance information signals by converting the displacement of movable members operated according to the contents of a performance into digital signals, and circuits for forming musical tone information signals corresponding to the contents of the performance from harmonic rich tone signals by controlling predetermined signal paths with electronic switches operated in response to the performance information signals, the digital performance information signals being detected and stored, and read out into the electronic switches at proper time instants, whereby all of the performance information signals are automatically reproduced as musical tone information signals with fidelity. The digital performance information can be automatically modified as desired in the process of storage and reproduction thereof to obtain modified musical tone information, and can furthermore be stored as information in a compressed state which contains digital signals indicating the occurrence of events in the performance and relative time information between the events.

Electronic musical instrument

Tone lever switches deliver respective digital information signals each representing the manipulated state of each tone lever. A memory circuit memorizes plural sets of the information signals. A write/read control circuit determines whether the memory circuit memorizes the digital information signals from the tone lever switches or it delivers out the memorized digital information signals. A tone color control circuit controls the respective intensities of the tone signals of respective voices in accordance with the information signals read out from the memory circuit.

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Hamamatsu, Japan

Akinori Endo