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Why is digital data not easily affected by noise?

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Why is digital data not easily affected by noise?

(a) High power transmission

(b) Cannot easily change binary 1 to 0

(c) High frequency transmission

(d) Low frequency transmission

I have been asked this question during an interview.

My query is from Digital Transmission of Data topic in section Digital Communication Techniques of Avionics

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Correct answer is (b) Cannot easily change binary 1 to 0

Best explanation: Noise is inevitable in a signal transmission. In a digital transmission the amplitude of the noise must be higher than the amplitude of the signal at binary ’1’, which is generally not the case, and vice versa. The receiver can differentiate between binary ‘1’ and ‘0’ with a significant amount of noise.

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