Podcast
Questions and Answers
What is the main factor that determines the directivity of a microphone?
What is the main factor that determines the directivity of a microphone?
What is the characteristic polar pattern of a pressure gradient microphone?
What is the characteristic polar pattern of a pressure gradient microphone?
How do sound sources arriving edge-on at the diaphragm affect a pressure gradient microphone?
How do sound sources arriving edge-on at the diaphragm affect a pressure gradient microphone?
What is the effect of partially closing the backside of a capsule in a microphone?
What is the effect of partially closing the backside of a capsule in a microphone?
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What is the name of the microphone type that responds to changes in pressure regardless of the direction of the sound source?
What is the name of the microphone type that responds to changes in pressure regardless of the direction of the sound source?
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What is the primary reason for the figure-eight directivity pattern of a pressure gradient microphone?
What is the primary reason for the figure-eight directivity pattern of a pressure gradient microphone?
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What is the main function of the interference tube in a microphone?
What is the main function of the interference tube in a microphone?
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In what way do the inner elements of a microphone affect its directivity?
In what way do the inner elements of a microphone affect its directivity?
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What is the difference between a pressure gradient microphone and a pressure transducer microphone?
What is the difference between a pressure gradient microphone and a pressure transducer microphone?
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How do the polar patterns of microphones relate to their capsule design?
How do the polar patterns of microphones relate to their capsule design?
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What is the significance of the diaphragm in a microphone?
What is the significance of the diaphragm in a microphone?
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Study Notes
Capsule Design and Directivity
- The shape of the microphone defines its directivity, with inner elements such as the structural shape of the capsule playing a major role.
- Outer elements, including the interference tube, can also influence directivity.
Pressure Gradient Microphones
- In pressure gradient microphones, both sides of the diaphragm are exposed to incident sound, making the microphone responsive to pressure differential (gradient) between the two sides of the membrane.
- Sound sources arriving edge-on at the diaphragm produce no pressure differential, resulting in a figure-eight, or bi-directional pattern.
- Pressure gradient microphones respond to the pressure difference between the two sides of the diaphragm.
Pressure Transducer Microphones
- In pressure transducer microphones, the capsule is closed on one side, resulting in an omnidirectional pattern that responds to changes in pressure regardless of direction to the source.
Polar Patterns
- Combining pressure gradient and pressure transducer effects in different ways creates various polar patterns.
- The cardioid pattern, for example, features a partially closed backside.
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Description
Learn about the importance of microphone design, including the shape of the capsule and its inner elements, and how it affects directivity. Discover how pressure gradient microphones work and how they respond to sound sources.
