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Radio hearing sensors use sound propagation for ____

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Radio hearing sensors use sound propagation for ____

(a) converting electromagnetic signal into electrical signals

(b) positioning

(c) imaging

(d) navigation

This question was addressed to me during an interview.

I need to ask this question from Location Awareness topic in portion Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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The correct answer is (d) navigation

To elaborate: Radio hearing sensors convert acoustic signals into electrical signals. Sound propagation is used for navigation, detection, and communication. For example, acoustic location estimation maybe used for cognitive location aware systems.

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