Communications: electrical – Digital comparator systems
Patent
1975-10-28
1977-07-19
Pitts, Harold I.
Communications: electrical
Digital comparator systems
340365S, 340365R, 340365C, 340384E, 340336, H04Q 514
Patent
active
040372006
ABSTRACT:
A switching matrix adapted to interface blind persons with electronic signals of the type used to drive a visual digital display device is disclosed. The matrix includes at least one series of raised electrically conductive terminals grouped into sets of braille coded characters representative of the digits 0 through 9 mounted on, but insulated from, an electrically conductive substrate. Each set is adapted to short circuit to the surrounding substrate when touched with a fingertip, thus forming a touch controllable switch.
An electronic circuit employing the matrix is also disclosed which produces an audible signal when the user touches a set of the terminals energized by a signal driving the corresponding digit of a visual digital display device.
REFERENCES:
patent: 3488449 (1970-01-01), Scheitler
patent: 3523161 (1970-08-01), Lewin
patent: 3576433 (1971-04-01), Lee
patent: 3584398 (1971-06-01), Meyer
patent: 3629665 (1971-12-01), Hoste
patent: 3725906 (1973-04-01), Quick
patent: 3766404 (1973-10-01), Larson
patent: 3845473 (1974-10-01), Kawashima
patent: 3877029 (1975-04-01), Larson
Cox Donald L.
Pitts Harold I.
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