A Simple Adaptive First-Order Differential Microphone

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.

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Document Details

Document Type
Technical Report
Publication Date
Aug 24, 1999
Accession Number
ADA512913

Entities

People

  • Gary W. Elko

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Absorption
  • Acoustic Fields
  • Acoustics
  • Algorithms
  • Anechoic Chambers
  • Background Noise
  • Detectors
  • Directional
  • Electroacoustic Transducers
  • Frequency
  • Frequency Response
  • Human Factors Engineering
  • Microphones
  • Noise
  • Signal Processing
  • Transducers

Readers

  • Calculus or Mathematical Analysis
  • Data Mining and Knowledge Discovery.
  • Phased Array Antenna Design.