Review of active methods for acoustic echo cancellation

Christian D. Audoly

doi:10.1117/12.148469

23 July 1993 Review of active methods for acoustic echo cancellation

Christian D. Audoly

Proceedings Volume 1916, Smart Structures and Materials 1993: Smart Materials; (1993) https://doi.org/10.1117/12.148469
Event: 1993 North American Conference on Smart Structures and Materials, 1993, Albuquerque, NM, United States

Abstract

One of the technical goals in underwater acoustics is to design coatings to reduce the acoustic echo from submerged structures to avoid detection versus active sonar systems. At sufficiently high frequencies, this can be done using passive materials. At low frequencies, however, the task is more difficult, and active systems are under consideration. The purpose of this paper is to summarize the different principles of acoustic active control that can be considered and to point out advantages and difficulties, with a few examples. They include: (1) piezoelectric (pseudo-passive) coatings; (2) control of the impedance of a piezoelectric transducer; (3) distributed array of local sensor/actuator systems; (4) combined sensor and actuator arrays.

Citation Download Citation

Christian D. Audoly "Review of active methods for acoustic echo cancellation", Proc. SPIE 1916, Smart Structures and Materials 1993: Smart Materials, (23 July 1993); https://doi.org/10.1117/12.148469

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