Bar graph digital interface circuit

Details Bar graph digital interface circuit Bar graph digital interface circuit

1975-09-15

1977-01-04

Heyman, John S.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

328 72, 328 37, 328 48, 328121, 340324R, H03K 13258, H03K 1700

Patent

active

040016994

ABSTRACT:
A circuit for controlling the height of a bar graph display in response to a digital input signal. A first count, representing the particular cathode segment of the bar graph under energization, is developed by a counter which monitors the clock signal driving the bar graph display. A second count is developed by a counter stepped by a clock when the digital input signal is in a selected logic state. At the end of a selected interval, the counters contents are transferred to a register for supply to a digital comparator, which compares the first and second counts and produces a control signal upon their equality.

REFERENCES:
patent: 3299313 (1967-01-01), Giacchi
patent: 3424986 (1969-01-01), Vasseur
patent: 3657658 (1972-04-01), Kubo
patent: 3660842 (1972-05-01), Ballantyne
patent: 3818354 (1974-06-01), Tomisawa et al.
patent: 3824379 (1974-07-01), Tomisawa et al.

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