Accession Number:

ADA512913

Title:

A Simple Adaptive First-Order Differential Microphone

Descriptive Note:

Conference paper

Corporate Author:

LUCENT TECHNOLOGIES INC MURRAY HILL NJ

Personal Author(s):

Report Date:

1999-08-24

Pagination or Media Count:

11.0

Abstract:

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.

Subject Categories:

  • Electrical and Electronic Equipment
  • Theoretical Mathematics
  • Miscellaneous Detection and Detectors
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE