Acoustics – Sound-modifying means – Intensifying horn
Patent
1987-11-16
1988-10-11
Fuller, B. R.
Acoustics
Sound-modifying means
Intensifying horn
181152, 181159, 181173, 181188, 181189, 381156, 381204, G10K 1110, H05K 500
Patent
active
047764287
ABSTRACT:
A sound projection system for use in diffusing sound of a frequency ranging from 160 Hz up to 5 KHz over a relatively long distance with a substantially constant distribution of the sound over a wide diffusion angle, whereby the quality and intensity of the sound transmitted by the system remain substantially constant for a listener even if this person is substantially offset from the general direction and orientation of the projection system. The system which is advantageously compact in size, comprises a cabinet defining an enclosure in which a loudspeaker is mounted. An acoustic channel of rectangular cross-section is connected to the cabinet in alignment with the loudspeaker. The channel which tapers laterally outwardly from its front end towards its rear end, comprises at least three profile shaped partitions extending vertically therein, the partitions being spaced apart in such a manner as to divide at least one substantial portion of the channel into a plurality of sub-channels substantially equal in size and shape. At least one of the partitions is centrally positioned in the channel in front of the loudspeaker. Each of the partitions has a front end projecting from the front end of the channel into the space defined by the cone-shaped diaphragm of the loudspeaker. Each of the partitions extends as close as possible to the diaphragm and is externally shaped to cause an air restriction adjacent the loudspeaker of the diaphragm and then a plurality of continuously expanding passages along the channel, through which the sound may expand.
REFERENCES:
patent: 2135610 (1938-11-01), Wente
patent: 2643728 (1953-06-01), Anthony
patent: 3136382 (1964-06-01), Thalen
patent: 3590169 (1971-06-01), Merhaut
patent: 3866710 (1975-02-01), Cesati
patent: 4181193 (1980-01-01), Isaac
Belisle Acoustique Inc.
Fuller B. R.
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