Folded acoustical horn

Details Folded acoustical horn Folded acoustical horn

1996-12-20

1998-03-10

Dang, Khanh

Acoustics

Diaphragm and enclosure

With horn

181177, 116140, H05K 500

Patent

active

057263965

ABSTRACT:
A folded acoustical horn is disclosed, having an acoustical transmission path that is generally arcuate about an axis, including a pair of arcuate mouths that are longitudinally spaced apart a selected distance and directed radially outwardly. A horn tuner is operable to selectively adjust the acoustical path to match selected sound frequencies.

REFERENCES:
patent: 3432002 (1969-03-01), Cohen
patent: 4378471 (1983-03-01), Shintaku
patent: 4689609 (1987-08-01), Ko et al.
patent: 4908601 (1990-03-01), Howze
patent: 5298690 (1994-03-01), Klein
FA-232073 Half-Mile Fog Signal Operating Manual of Automatic Power, Inc., pp.2-4 and three pages of drawings dated Aug. 16, 1968.
The "Stacked Array" SA-3C--Fog Signal System Operating Manual of Automatic Power, Inc., p. 1 and two pages of drawings dated Jun. 22, 1964 and Sep. 23, 1969, respectively.
DA-2 and DA-8 Fog Horn Operating Manual of Automatic Power, Inc., pp. 4, 8 and 9, and two pages of drawings dated May 18, 1982 and Jun. 18, 1982, respectively.
SA-850/1A Half-Mile Signal one undated page of promotional material of Automatic Power, Inc.
SA-850/3 Sound Signal one undated page of promotional material of Automatic Power, Inc.
SA-850/4A Battery Operated Two-Mile Sound Signal one undated page of promotional material of Automatic Power, Inc.
AB-26 Audiobeam.RTM. 1/2-Mile Fog Signal two pages of promotional material of Tideland Signal Corporation, dated 1984.
AB-560 Audiobeam.RTM. 2-Mile Fog Signal four pages of promotional material of Tideland Signal Corporation, dated 1986.
AB-860 Audiobeam.RTM. 2-Mile Fog Signal four pages of promotional material of Tideland Signal Corporation, dated 1989.
Finch, R.D. & Higgins, P.W., Optimizing the Monotone Performance of Electrodynamic Drivers Using Tubular Couplers, Journal of the Acoustical Society of America, vol. 60, No. 4, Oct., 1976, pp. 937-943.
Olson, H.F., Acoustical Engineering, D. Van Norstrand Company, Inc., Princeton, NJ, 1957, pp. v-xix, 47-55, 66-70, 100-123, 163-167 and 240-242 .

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