Apparatus and associated method for recovering lost break codes for wireless keyboards
US5955975A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for recovering "break" codes transmitted by a keyboard that are not properly received by the receiver of the computer system. The keyboard is an infrared keyboard that transmits to a receiver in the computer system "make" codes when the keys are depressed and transmits to the receiver "break" codes when the keys are released. Upon receipt of the "make" and "break" codes, the receiver keeps track of the status of each of the keys, i.e., depressed or released, by updating a database in response to receipt of the "make" and "break" codes. At select time intervals, the keyboard transmits to the receiver an "idle" code containing data corresponding to the status of each key. Upon receipt of the "idle" code, the receiver compares the "idle" code with the status of each key as indicated by the data base. The receiver then generates a "break" code for each of the keys that do not compare.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.