The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 1977
Filed:
Aug. 11, 1975
Norio Tomisawa, Hamamatsu, JA;
Yasuji Uchiyama, Hamakita, JA;
Takatoshi Okumura, Hamamatsu, JA;
Toshio Takeda, Hamamatsu, JA;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JA;
Abstract
This key switch system (1) scans closed (or open) key switches in a matrix to produce corresponding key data, (2) encodes these key data into corresponding key codes, and (3) effectively registers the encoded key codes into time-shared channels of a key code memory. The key switch system may be incorporated in an electronic musical instrument. The system includes a key data generator which produces block data consisting of one pulse per scanning cycle in a time slot representing a block to which a key switch which is ON belongs, and note data consisting of a pulse in a time slot representing the particular key switch which is ON in the block indicated by the block data. A key coder encodes the block data and note data supplied from the data generator into key codes each representing the key name of the depressed key. A channel processor allots the key codes to storage channels of a key code memory having a number of such channels equal to the maximum number of tones to be reproduced simultaneously.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile