(19)
(11) EP 0 376 342 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.11.1990 Bulletin 1990/48

(43) Date of publication A2:
04.07.1990 Bulletin 1990/27

(21) Application number: 89124128.3

(22) Date of filing: 29.12.1989
(51) International Patent Classification (IPC)5G10H 7/08, G10H 7/00
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 29.12.1988 JP 334158/88
29.12.1988 JP 334161/88
29.12.1988 JP 334162/88
29.12.1988 JP 334163/88
29.12.1988 JP 334166/88

(71) Applicant: CASIO COMPUTER COMPANY LIMITED
Shinjuku-ku Tokyo 160 (JP)

(72) Inventors:
  • Shiba, Kosuke Patent Dpt.Dev. Div. Hamura R&D Cent
    Hamura-machi Nishitama-gun Tokyo 190-11 (JP)
  • Daigo, Koichiro Patent Dpt.Dev. Div. Hamura R&D Ce
    Hamura-machi Nishitama-gun Tokyo 190-11 (JP)
  • Ogura, Kazuo Patent Dpt.Dev. Div. Hamura R&D Cent.
    Hamura-machi Nishitama-gun Tokyo 190-11 (JP)
  • Usami,Ryuji Patent Dpt.Dev. Div. Hamura R&D Cent.
    Hamura-machi Nishitama-gun Tokyo 190-11 (JP)

(74) Representative: KUHNEN, WACKER & PARTNER 
Alois-Steinecker-Strasse 22
85354 Freising
85354 Freising (DE)


(56) References cited: : 
   
       


    (54) Data processing apparatus for electronic musical instruments


    (57) A data processing apparatus for an electronic musi­cal instrument permits a microcomputer (31) to run a tone generating program for generating various types of musical tones. The microcomputer (31) calls the program by a timer interrupt signal and runs it for tone genera­tion. The tone generation process is executed to gene­rate a musical tone in synchronism with an envelope waveform process. Further, even if the time for sam­pling digital musical tones to be sent to a D/A con­verter is not constant, an analog signal free of distortion can be acquired.







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