Electrical audio signal processing systems and devices – Megaphones
Patent
1997-04-30
1999-01-12
Tran, Sinh
Electrical audio signal processing systems and devices
Megaphones
381 77, 381 82, H04R 2704
Patent
active
058599150
ABSTRACT:
A sound projection device for use in speaking to one or more specific persons on a selective basis, the device including a housing having a directional aspect for aiming the housing at a target area, a gripping handle coupled to the housing to enable the device to be held in a user's hand, and a parametric speaker coupled to a front end of the housing for indirectly generating at least one new sonic frequency from at least two ultrasonic frequencies of different value. The housing includes a luminating source having a directional orientation substantially aligned with the directional aspect of the housing. The combination of light and directional sound source enables the user to visually identify the target area before transmitting the sonic frequency to the target.
REFERENCES:
patent: 1616639 (1927-02-01), Sprague
patent: 1951669 (1934-03-01), Ramsey
patent: 2461344 (1949-02-01), Olson
patent: 3012222 (1961-12-01), Hagemann
patent: 3398810 (1968-08-01), Clark, III
patent: 3461421 (1969-08-01), Stover
patent: 3612211 (1971-10-01), Clark, III
patent: 3613069 (1971-10-01), Cary et al.
patent: 3710332 (1973-01-01), Tischner et al.
patent: 3723957 (1973-03-01), Damon
patent: 3742433 (1973-06-01), Kay et al.
patent: 3836951 (1974-09-01), Geren et al.
patent: 4207571 (1980-06-01), Passey
patent: 4245136 (1981-01-01), Krauel, Jr.
patent: 4378596 (1983-03-01), Clark
patent: 4593160 (1986-06-01), Nakamura
patent: 4823908 (1989-04-01), Tanaka et al.
patent: 4991148 (1991-02-01), Gilchrist
patent: 5181301 (1993-01-01), Wheeler
patent: 5317543 (1994-05-01), Grosch
patent: 5357578 (1994-10-01), Taniishi
Ultrasonic Ranging System--Polaroid.
Helmholtz (Excerpts from On Combination Tones)--Editor's Comments on Paper 16.
Aoki, K., et al., "Parametric Loudspeaker--Characteristics of Acoustic Field and Suitable Modulation of Carrier Ultrasound," Electronics and Communications in Japan, Part 3, vol. 74, No. 9, pp. 76-82 (1991).
Makarov, S.N., et al., "Parametric Acoustic Nondirectional Radiator," Acustica, vol. 77 (1992).
Westervelt, P.J., "Parametric Acoustic Array," The Journal of the Acoustical Society of America, vol. 35, No. 4, pp. -(1963).
American Technology Corporation
Tran Sinh
LandOfFree
Lighted enhanced bullhorn does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lighted enhanced bullhorn, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lighted enhanced bullhorn will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1523139