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To display time in railway stations which digital circuit is used?

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To display time in railway stations which digital circuit is used?

(a) seven segment decoder

(b) eight segment encoder

(c) 8:3 multiplexer

(d) 9 bit segment driver

The question was posed to me in homework.

The origin of the question is Boolean Algebra topic in portion Boolean Algebra and Modeling Computations of Discrete Mathematics

1 Answer

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Right answer is (a) seven segment decoder

For explanation I would say: A seven segment decoder is a digital circuit which is used to construct a common type of digital display device i.e., a set of LED (or LCD) segments that display numbers from 0 through 9 at the command of a four-bit code. Moreover, the behavior of the display driver IC is represented by a truth table with seven outputs.

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