Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-12-21
1982-04-06
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
310319, 340365S, 400368, 400479, G06F 302
Patent
active
043238882
ABSTRACT:
A keyboard system having a plurality of actuable keys is coupled through a central processing unit to an indicia accessing unit for accessing indicia corresponding to said keys. An automatic repeat circuit also interconnects the keyboard system with the central processing unit and includes pressure transducer means responsive to actuating pressure on said keys for producing an amplitude variable signal which causes a signal convertor to produce a corresponding rate variable signal which when fed to the central processing unit causes repetitive accessing of the corresponding indicia at a selectable rate. Feedback from the central processing unit to the repeat circuit determines which key signals are to be operative for repetitive indicia access.
REFERENCES:
patent: 3436735 (1969-04-01), Hoiseth
patent: 3781874 (1973-12-01), Jennings
patent: 4020391 (1977-04-01), Baxter
patent: 4106011 (1978-08-01), Melanson et al.
IBM Technical Disclosure Bulletin, Harrod, vol. 20, No. 10, Mar. 1978, pp. 4039-4040.
IBM Technical Disclosure Bulletin, Dahl, vol. 20, No. 1, Jun. 1977, pp. 315-316.
Groody James J.
Megadata Corporation
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