Microphone Sensitivity and Feedback: Difference between revisions
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It is a common misconception that a microphone that has lower sensitivity (in other words, a sound of a given intensity at the microphone produces a lower electrical signal than a microphone of higher sensitivity) is somehow more susceptible to microphone feedback. | It is a common misconception that a microphone that has lower sensitivity (in other words, a sound of a given intensity at the microphone produces a lower electrical signal than a microphone of higher sensitivity) is somehow more susceptible to microphone feedback. | ||
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Feedback occurs when the sound from the loudspeaker (or loudspeakers if a microphone is connected to more than one) is louder at the microphone than the sound of the voice. | Feedback occurs when the sound from the loudspeaker (or loudspeakers if a microphone is connected to more than one) is louder at the microphone than the sound of the voice. | ||
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This fundamental fact is shown in the figure below. | |||
[[Image:Feedback fig 1.jpg|800px|Microphone Feedback]] | |||
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If you just decrease the microphone sensitivity, the sound from the loudspeaker goes down by the amount of the sensitivity reduction. | If you just decrease the microphone sensitivity, the sound from the loudspeaker goes down by the amount of the sensitivity reduction. | ||
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So it all comes down to one thing: when there is enough loudness in the room, how much better can the microphone hear the desired source than it hears the sound system? Sensitivity doesn't enter into this equation. | So it all comes down to one thing: when there is enough loudness in the room, how much better can the microphone hear the desired source than it hears the sound system? Sensitivity doesn't enter into this equation. | ||
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[[Category:Feedback]] | |||