Sound generating system for a keyboard
US4694725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1985 |
| Grant date | Sep 22, 1987 |
| Priority date | — |
| Expiry date | Sep 3, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/165
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for establishing the volume level of a tone generator associated with a keyboard in which the tone generator will output a click tone when each key on the keyboard is actuated. In establishing the volume level of a click tone, the keyboard is put into a volume setting mode by the actuation of two key members of the keyboard. The subsequent actuation of each key member will produce a different volume level of the click tone. The actuating of a key member results in the storing of a count in a storage member. The storage member is then downcounted until it reaches zero. Upon reaching the count of zero, processing means generates a pulse train in which the pulse width is determined by the time it takes for the storage member to count down to zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.