For a keynote speaker's speech, a unidirectional microphone, particularly a cardioid microphone, is often the best choice. Here’s why:
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Unidirectional/CARDIOID Microphones: These microphones are designed to pick up sound primarily from one direction (the front) while rejecting noise from other directions (sides and back). This is ideal for a keynote speaker, as it focuses on the speaker's voice and minimizes background noise from the audience or venue.
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Omnidirectional Microphones: These pick up sound from all directions, which can be useful in some situations, but for a controlled speech environment, they may also pick up unwanted noise.
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Bidirectional Microphones: These are designed to pick up sound from two opposite directions (front and back) and are less commonly used for solo speaking engagements.
In summary, a cardioid (unidirectional) microphone is usually the best option for a keynote speaker, as it helps ensure clear audio from the speaker while minimizing background noise.