A Simple Adaptive First-Order Differential Microphone
LUCENT TECHNOLOGIES INC MURRAY HILL NJ
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This talk covers the design and implementation of a novel adaptive first- order differential microphone that minimizes the microphone output power under the constraint that the solitary first-order microphone null is located in the rear-half plane. Although the solution presented does not maximize the signal-to-noise ratio, it can significantly improve the signal-to-noise ratio in certain acoustic fields. An adaptive differential microphone has been implemented by combining two omnidirectional elements to form back-to-back cardioid directional microphones. By combining the weighted subtraction of these two outputs, any first-order array can be realized. If certain constraints are placed on the combination weighting, the null location can be constrained to defined angular regions.
- Electrical and Electronic Equipment
- Theoretical Mathematics
- Miscellaneous Detection and Detectors