Casio Computer Co., Ltd.

Yoshiki Negoro

Jun Hosoda

Takashi Akutsu

Hajime Manabe

Kazuo Ogura

Yoshito Yamaguchi

Ryuji Usami

Teruo Jinbo

Koichiro Daigo

Kosuke Shiba

Satoru Koguchi

A main CPU and a sub CPU take share of executing a tone generating process to generate multiple tone signals on a real-time basis without using an exclusive tone generator. The main CPU and sub CPU are formed on a one-chip LSI, thus facilitating realization of a compact electronic musical instrument. According to another structure, the main CPU executes tone generation while the sub CPU performs an effect process, thereby permitting a one-chip LSI to generate an effect-added musical tone.

Multi-channel tone generation apparatus with multiple CPU's executing

Apparatus for executing respective portions of a process by main and sub

An automatic performance apparatus which easily changes the tempo and direction of automatic performance of a musical instrument, for example, to a rhythm of a rap music such that a disc jockey operates a scratch disc. Clock frequency SQCK of sequence counter 202 is changed in accordance with the speed and quantity of rotation of disc 102 and ball 1101 rotated with user's fingers, so that the timing of reading event data and event time data out of sequencer memory 206 is controlled and the tempo of the automatic performance is changed. When the user changes the rotational direction of disc 102, counter 202 performs a decrementing operation in accordance with a rotational direction signal output from rotational direction detector 110, thereby giving a reverse automatic performance. At the start of the automatic performance, disc 102 starts to rotate at a predetermined rotational speed in accordance with tempo data read out of sequencer memory 206 to thereby determine the initial tempo of the automatic performance (FIG. 1).

Automatic performance apparatus with operated rotation means for tempo

Digital information processing apparatus with multiple CPUs

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Fussa, Japan

Yoshiki Negoro