Title: Key assigner

Abstract: A key assigner for use in an electronic musical instrument is capable of detecting changes in key switches by comparing present ON-OFF states of the key switches with previous ON-OFF states thereof. Only one of detection signals is delivered out by a priority circuit in a predetermined order of priority and a key code corresponding to this delivered out signal is produced. This key code is compared with key codes of respective channels previously stored in a key code memory having channels equal in number to an available tone number (i.e. a maximum number of tones to be reproduced simultaneously) to detect whether there is coincidence or not. A detection signal produced in a case where there is coincidence represents release of the key, whereas a detection signal produced in a case where there is no coincidence represents new depression of the key, and in this latter case the key code is stored in the key code memory. The outputs of the key code memory are decoded to provide tone generation control signals. An example is shown in which the priority circuit is applied to a monophonic music synthesizer.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Oya, Akiyoshi (Hamamatsu, JA)

Application Number: 609846
Filing Date: 1975-09-02
Publication_date: 1976-09-21
Assignee: Nippon Gakki Seizo Kabushiki Kaisha (JA)
Primary Class(es): 84/618 84/656, 84/684, 984/336, 984/377, 984/DIG1
Other Classes:
US Patent Ref:

3610799	Oct, 1971	Watson	84/1.
3697661	Oct, 1972	Deutsch	84/1.
3746773	Jul, 1973	Uetrecht	84/1.
3760358	Sep, 1973	Isii	84/1.
3828643	Aug, 1974	Morez	84/1.
3842184	Oct, 1974	Knierkamp	84/1.
3899951	Aug, 1975	Griffith et al.	84/1.

Other Refs:
Primary Examiner: Hix, L. T.
Assistant Examiner: Miska, Vit W.
Attorney: Ladas, Parry, Von Gehr, Goldsmith & Deschamps