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The number of times an electronic signal changes its state is measured by ____

(a) word rate

(b) signal rate

(c) bit rate

(d) baud rate

The question was asked in exam.

My doubt is from Hardware Architecture topic in division Software Defined Radio Architecture of Cognitive Radio

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Correct answer is (d) baud rate

To explain I would say: Baud rate gives the rate at which information is sent in a communication channel. The number of times an electronic signal changes state is measured by baud rate.

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