Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1985-10-01
1988-02-16
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340703, 358 30, 358 32, G09G 116
Patent
active
047258330
ABSTRACT:
In a tone control device in a monochromatic tone display apparatus, when an intensity signal and at least one of the R, G and B signals is active, an AND gate generates a maximum tone level signal. A selector/adder having OR gates and resistors receives the maximum tone level signal and the R, G and B signals. When the maximum tone level signal is inactive, the selector/adder generates a tone level signal in response to the active state of the R, G and B signals. When the maximum tone level signal is active and all the R, G and B signals are inactive, the selector/adder generates a minimum tone level voltage. However, when the maximum tone level signal and at least one of the R, G and B signals is active, the selector/adder generates a maximum tone level voltage.
REFERENCES:
patent: 4158200 (1979-06-01), Seitz et al.
patent: 4236175 (1980-11-01), Groothuis
patent: 4251755 (1981-02-01), Bryden
patent: 4481529 (1984-11-01), Kerling
IBM Personal Computer XT Hardware Reference Library, Technical Reference, "IBM Color/Graphic Monitor Adaptor", (No Date of Publication).
Brigance Gerald L.
Kabushiki Kaisha Toshiba
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