Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1990-04-26
1991-01-22
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
181182, 181184, 181160, 381 96, H04R 300
Patent
active
049875647
ABSTRACT:
An acoustic apparatus comprising a resonator having a resonance radiation unit for radiating an acoustic wave by resonance, a vibrator arranged in the resonator, and a vibrator drive means for driving the vibrator. The vibrator has a diaphragm having a direct radiator portion for directly radiating an acoustic wave, and a resonator driver portion for driving the resonator. The vibrator drive means has a drive control means for controlling the drive condition so as to equivalently reduce or invalidate the internal impedance inherent to the vibrator.
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patent: 4712247 (1987-12-01), Swarte
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"Synthesis of Loudspeaker Mechanical Parameters by Electrical Means: A New Method for Controlling Low-Frequency Loudspeaker Behavior" by Karl Erik Stahl, 61st Convention of the Audio Engineering Society, New York, 1978; Revised 1981.
"Loudspeakers In Vented Boxes: Part I", A. N. Thiele, Journal of Audio Engineering Society, pp. 382-392, May 1971, vol. 19, No. 5.
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"A New Approach to Loudspeaker Damping"; Warner Clements, Audio Engineering; Aug. 1951.
Eldred J. Woodrow
Jordan Charles T.
Yamaha Corporation
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