Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1979-05-07
1981-08-18
Brown, Thomas W.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
179146E, 179180, 181151, 181199, H04R 126, H04R 128
Patent
active
042848440
ABSTRACT:
A loudspeaker system makes use of a closed cubic enclosure the front of which is a square baffle having tapered edges, the intersections of which fit the outline of an imaginary sphere which substantially encompasses the enclosure. Wide dispersion of audible acoustic waves of low frequency with a minimal amount of diffraction from a woofer loudspeaker mounted in the baffle at the convergence of the tapered edges occurs. A tweeter is mounted in substantially freely spaced relationship with the enclosure to provide also for wide dispersion of acoustic waves of high frequency. The enclosure is tuned to enhance the low end of its frequency response. A semirigid foam front panel having beveled edges is disposed on the baffle over the woofer and acts as an acoustically transparent front grill for the system. The tweeter is encased in acoustically transparent material mounted on the top of the enclosure. The system has a uniform frequency response over the entire audible band and gives the image to the listener of an acoustic source of a size much larger than the actual size of the system.
REFERENCES:
patent: 1988250 (1935-01-01), Olson
patent: 3578103 (1971-05-01), Lennes
patent: 4008374 (1977-02-01), Tiefenbrun
patent: 4139734 (1979-02-01), Fincham
patent: 4161995 (1979-07-01), Pohlmann et al.
patent: 4169516 (1979-10-01), Honda
patent: 4182931 (1980-01-01), Kenner
"Direct Radiator Loudspeaker Enclosures", Harry F. Olson, Audio Engineering, Nov. 1951, pp. 34-36.
Belles Research Corp.
Brown Thomas W.
Lukacher Martin
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