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A standard microphone is omni directional which means it picks up sounds from all around you and amplifies it. A directional microphone is one that only picks up sounds in front and beside you and amplifies it but does not amplify sounds from behind you. These microphones are designed to help people hear in the presence of background noise. With advancements in technology, hearing aids will now function in an omni directional mode in quiet and will switch automatically to a directional mode in a noisy environment.
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