Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-04-28
1983-09-20
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
340365S, G06F 302
Patent
active
044059175
ABSTRACT:
A capacitance keyboard matrix screening and grounding arrangement and method are disclosed in which scanning drive means and scanning sense means sequentially address drive and sense conductors in drive and sense conductor arrays respectively and maintain a reference potential on all conductors except for individual conductors while they are being addressed. The scanning drive and sense means are implemented with demultiplexers whose output terminals are each connected to a drive or sense conductor through an inverter.
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IBM Technical Disclosure, Bufford, vol. 21, No. 11, Apr. 1979, pp. 4548-4549.
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IEEE Journal of Solid-State Circuits, Katz et al., vol. SC-13, No. 5, Oct. 1978, pp. 561-565.
Patent Abstracts of Japan, vol. 2, No. 156, p. 10106E 78, Dec. 26, 1978.
Groody James J.
Honeywell Inc.
Rubow Charles L.
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