ITI 1100 Lecture Notes - Boolean Expression, Digital Electronics
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10 Oct 2022
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Lecture 4 - boolean algebra and logic gates (chapter 2 part 2) The boolean expression (un-simplified) can be obtained from the truth table: consider the following arbitrary truth table. Using the false terms in the truth table. Sometimes it is easier to work with the terms that describe when the function is false. For example, if a function has four variables then there are sixteen possible states. If for instance thirteen out of sixteen were true, then only three out of sixteen are false. In our example, two out of eight are false. The boolean expression (un-simplified) can be obtained from the truth table using false terms. Design a digital circuit that will be used to control an alarm bell. This alarm bell is to be installed in a room to protect it from unauthorized entry. Sensor devices provide the following logic signals. C = 1 the control system is active. D = 1 the room door is closed.