Auditory Icons and Earcons in userface (Human interactions)

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Research and explain the difference between auditory icons and earcons.
Give reasons why and when/where audio can be useful, and give examples.
Explain when sound is not a good idea in an interface, and give examples.
Describe some of the obstacles to speech recognition or speech production (or both) and give examples.
Explain what accessibility and redundancy mean and why they are appropriate to incorporate in ethical design.