Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-04-05
1977-05-31
Habecker, Thomas B.
Communications: electrical
Audible indication
Percussion-type sound producer
340365S, G08C 100
Patent
active
040273067
ABSTRACT:
A touch-responsive circuit uses an ohmic contact connected via a dc blocking capacitor to the high impedance input of an amplifier. A controllable impedance element shunts the capacitor and amplifier input. When the element is in the high impedance state, a weak voltage induced by touching the ohmic contact causes the amplifier to produce an output signal indicative of such touching. Touch response is disabled when the element is in the low impedance state. Advantageously, the controllable impedance element comprises a series-connected pair of diodes that are selectively forward or reverse biased; the element also may comprise an active electronic device such as a transistor.
A data input terminal employs a matrix of ohmic contacts each having an associated touch-responsive circuit. Column scanning is accomplished by conditioning the controllable impedance elements in all but a selected one column to the low impedance state so that touch response is enabled only in that one selected column. The ohmic contacts in each row are connected to a common amplifier for that row. A priority encoder provides an encoded signal designating which amplifier produces a touching-indicative signal, and hence designating which row in the enabled column contains the touched ohmic contact.
REFERENCES:
patent: 3786497 (1974-01-01), Davis et al.
patent: 3846791 (1974-11-01), Foster
patent: 3857100 (1974-12-01), Baars
patent: 3886539 (1975-05-01), Gould
patent: 3971013 (1976-07-01), Challoner
Nick, IBM disclosure Bulletin, vol. 6, No. 4, Sept. 1963, pp. 135, 136.
Habecker Thomas B.
Silber Howard A.
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