Eisaku Okamoto

Electronic musical instrument having system for judging player's performance

An electronic musical instrument comprises a keyboard arranged to produce key code signals in response to key operations thereof and a memory storing performance data constituting progression of a music and corresponding to key operations to be effected on the keyboard to play the music. A key operation judging circuit is provided which compares the key code signals produced by the keyboard with the performance data read out of the memory to detect whether or not a pupil or trainee correctly operates keys in a corresponding relation to the performance data read out of the memory. The percentages of correct key operations are calculated and displayed with respect to the key-on timing and the pitch and duration of notes.

Automatic performing apparatus of electronic musical instrument

An automatic performing apparatus of an electronic musical instrument comprises a memory for storing musical note data representing progression of a music to be played and control data for controlling such a generation mode of music tones being generated as tone color and modulation effect. The generation mode of musical tone signals generated by a tone forming circuit in response to the musical note data read out of the memory is also automatically controlled by the control data read out of the memory.

Synthesizer type electronic musical instrument with volume envelope decay time control

A synthesizer type electronic musical instrument in which a volume envelope imparted to a tone signal decays with a decay time after release of a key. In such an electronic musical instrument, the decay time of the volume envelope is caused to vary according to the note of the key being actuated. As a decay time controlling signal, a pitch determining voltage signal is applied to a control voltage generator for a voltage-controlled amplifier, or is adapted to control a control voltage from the control voltage generator so that the control voltage may be of a waveform having a decay time which depends on the magnitude of the pitch determining voltage signal.

Synthesizer type electronic musical instrument

An electronic musical instrument includes a pitch determining voltage signal generating circuit adapted to produce one of 12 pitch determining voltage signals having different magnitudes corresponding to 12 notes in one octave in response to any of keys belonging to different octave ranges in a keyboard and having the same note name. A pitch determining voltage signal common to the different octave ranges is converted by a voltage converting circuit and taken out as a voltage signal having a magnitude corresponding to the note of a key being depressed on the keyboard. The voltage converting circuit includes a voltage dividing network having a plurality of output points and gate circuits connected to the output points, respectively. Each gate circuit is enabled in response to the depression of a key belonging to a corresponding octave range. Alternatively, the voltage converting circuit is constructed of a variable gain amplifier whose voltage gain is controlled dependent upon the octave range to which a key being depressed belongs.

Music data reading type electronic musical instrument

An electronic musical instrument having a reading device for reading music-playing data recorded on a part of a music sheet, comprises a musical instrument body having a first groove to support the music sheet during the play of a music and a second groove to initially receive the music sheet and to transfer the sheet into the first groove, with the first and second grooves being continuous to each other. The reading device reads the music-playing data from the sheet as the sheet is transferred through the second groove into the first groove, and supplies the data thus read to an internal memory device. Music is automatically played by successively reading out the music-playing data from the memory device.