Music – Instruments
Patent
1975-08-04
1977-08-16
Schaefer, Robert K.
Music
Instruments
84 103, G10H 100
Patent
active
040418260
ABSTRACT:
An electronic musical instrument called a music synthesizer has channels equal in number to a maximum number of tones to be reproduced simultaneously and can produce a plurality of musical tones simultaneously. Note voltages are sampled by actuating corresponding key gate circuits and the sampled note voltages are allotted to corresponding channels in time-shared sequence. Musical tones are reproduced from the note voltages allotted to the respective channels. A key gate control signal for actuating the key gate circuit is obtained by detecting ON-OFF states of keys and generating a key code corresponding to a key which is ON, storing this key code in a key code memory having channels of the maximum number of tones to be reproduced simultaneously under certain conditions and decoding the key code produced from the key code memory. The musical instrument comprise means for producing the key gate control signal at a slower rate than the rate of scanning the keys.
A channel corresponding to the key which was released first is detected, a key gate control signal corresponding to this channel is cancelled and a key code representing a newly depressed key is stored in this channel to produce a corresponding key gate control signal whereby the channel corresponding to the key which was released first is detected.
REFERENCES:
patent: 3639913 (1972-02-01), Watson
patent: 3696201 (1972-10-01), Arsem
patent: 3697661 (1972-10-01), Deutsch
patent: 3746773 (1973-07-01), Uetrecht
patent: 3828110 (1974-08-01), Colin
patent: 3871247 (1975-03-01), Bonham
patent: 3882751 (1975-05-01), Tomisawa
patent: 3890871 (1975-06-01), Oberheim
patent: 3899951 (1975-08-01), Griffith et al.
patent: 3986423 (1976-10-01), Ressum
patent: 3991645 (1976-11-01), Luce et al.
Miska Vit W.
Nippon Gakki Seizo Kabushiki Kaisha
Schaefer Robert K.
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