Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1990-12-06
1993-02-02
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367163, 367174, 367176, 310337, 181160, 181182, H04R 1700
Patent
active
051843323
ABSTRACT:
A multiport underwater sound transducer including a hollow resilient housing enclosing a volume with at least two ported resonant chambers and a transduction driver disposed within the volume with opposite sides of the driver driving the two chambers. The two ports are set to resonate at slightly different frequencies and the tranducer proudces an additive output at frequencies between the two slightly different frequencies due to phase reversals of oppositely phased sound waves.
REFERENCES:
patent: 3562451 (1971-02-01), Mullen, Jr.
patent: 4413198 (1983-11-01), Bost
patent: 4549631 (1985-10-01), Bose
patent: 4628528 (1986-12-01), Bose et al.
patent: 4821244 (1989-04-01), Wood
Eldred J. Woodrow
Image Acoustics, Inc.
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