Keyboard system for an electric musical instrument in which each key is provided with an independent output to a processor
US5883327A · kind A · utility
5Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1992 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Dec 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2220/271
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A keyboard system for an electronic musical instrument includes: a keyboard having a number of keys; a keyboard central processing unit (CPU) coupled to the keyboard; a switch connected to each key on the keyboard; a pull-up resistor serially connected to each switch; a unit for applying voltage to a serial circuit of each switch and each pull-up resistor; and a unit for parallel supplying a signal at an intersection point between each switch and each pull-up resistor to the CPU. The operation states of a plurality of keys can be independently detected by sequentially detecting the potential at the interconnection points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.