Truncate prioritization system for multi channel electronic musi

Details Truncate prioritization system for multi channel electronic musi Truncate prioritization system for multi channel electronic musi

1986-04-23

1987-11-03

Witkowski, S. J.

Music

Instruments

84DIG2, 84 101, 340365S, 3408255, 328137, 328154, 307231, G10H 122, G10H 700

Patent

active

047036800

ABSTRACT:
An electronic musical instrument comprises a keyboard for generating tone data or key codes each representative of a tone to be generated and a tone generating circuit having a plurality of tone generating channels. The electronic musical instrument also comprises a RAM having a plurality of storing positions for storing the key codes each of which is assigned under the control of a central processing unit (CPU) to a respective one of the tone generating channels to thereby generate a tone determined by the assigned key code. When a key is newly depressed on the keyboard, each of the key codes stored in the RAM is read therefrom and supplied to an envelope generator which in turn generates data representative of an amplitude of each of the envelopes given to the tones. The key codes read from the RAM are also supplied to a ROM to read therefrom weighting data. The CPU modifies each of the envelope amplitude data based on a respective one of the weighting data, and selects one of the key codes stored in the RAM in accordance with the modified envelope data. Then, the CPU replaces the selected key code in the RAM by the key code generated in response to the new depression of the key.

REFERENCES:
patent: Re31931 (1985-07-01), Tomisawa
patent: 4041826 (1977-08-01), Oya
patent: 4335639 (1982-06-01), Okamoto
patent: 4357849 (1982-11-01), Ezawa et al.
patent: 4481851 (1984-11-01), Swain et al.
patent: 4570520 (1986-02-01), Deutsch et al.

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