Acoustics – Diaphragm and enclosure – Reflector baffle
Patent
1997-04-08
1998-10-13
Dang, Khanh
Acoustics
Diaphragm and enclosure
Reflector baffle
181144, 181152, 381 99, H05K 500
Patent
active
058214704
ABSTRACT:
An acoustical transmitting system and method for producing a narrow beam of acoustic energy over a broadband operating frequency range utilizes a parabolic reflector dish, a horn-loaded compression driver for directing acoustic energy toward the dish's reflecting surface, and a low frequency driver mounted behind a central aperture in the dish for producing acoustic energy that combines and interacts with the reflected acoustic energy produced by the horn-loaded compression driver. An input signal processing circuit is provided to condition the audio signal to the horn-loaded compression driver and the low frequency driver to achieve on-axis gain and off-axis cancellations at low frequencies. The addition of the low frequency driver to the reflector dish system effectively extends the ability of the system to produce and transmit acoustic energy in a narrow distribution pattern at frequencies below 1000 Hz using a four foot diameter dish.
REFERENCES:
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patent: 5532438 (1996-07-01), Brown
Meyer Sound Catalog Sheet, 1993 Accoustical Ranging Transceiver System.
Kohut Paul J.
Meyer John D.
Beeson Donald L.
Dang Khanh
Meyer Sound Laboratories Incorporated
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