Acoustics – Diaphragm and enclosure
Patent
1989-06-01
1991-01-15
Fuller, Benjamin R.
Acoustics
Diaphragm and enclosure
181144, 181150, 181154, 181155, 181199, H05K 500
Patent
active
049846531
DESCRIPTION:
BRIEF SUMMARY
SCOPE OF APPLICATION
The present invention relates to a loudspeaker arrangement in which the sound from at least one loudspeaker or some other sound source is directed via sound guide compartment means to sound emission apertures.
STATE OF THE ART
Such a loudspeaker arrangement, particularly as a loudspeaker box, is known in different forms of construction. A loudspeaker arrangement of this kind may be equipped with several loudspeakers, preferably with different frequency response, such as tweeter loudspeakers and woofer loudspeakers.
In known loudspeaker arrangements, the sound is projected at a more or less narrow angle so that the impression of a relatively concentrated sound source is created. For stereo signals, two such loudspeakers are disposed a certain distance from one another and triggered by different signals.
A loudspeaker arrangement is already known in which the sound is conducted from at least one loudspeaker or some other sound source via sound guide compartments to sound emission apertures. In this arrangement, provision is made for two, preferably plane, sound guide surfaces being disposed, when viewed in the direction of the sound projection, opposite the loudspeaker, which sound guide surfaces are, in the manner of a ship's bow, inclined towards one another at an obtuse angle, wherein the angle bisector (reference angle bisector) located approximately at the center of the height or the width, respectively, of the sound guide surfaces, is directed at least approximately at the center of the loudspeaker (U.S. Pat. No. 2,858,899).
In another known loudspeaker arrangement, provision is made for housing walls to be constructed above the loudspeaker above the loudspeaker at an angle to the sound guide, which cover the space between the loudspeaker and the sound guide surfaces. In this case, consisting the loudspeaker is disposed on a loudspeaker baffle which is a little larger than the loudspeaker aperture and likewise functions as a sound guide surface (FR-PS No. 2 579 852).
TECHNICAL PROBLEM--SOLUTION--ADVANTAGES
The present invention is based upon the technical problem of providing a universal hi-fi sound reflection loudspeaker arrangement that is accommodated inside a more or less compact housing and which, with its special properties, constitutes a universal hi-fi sound reflection box which, for the generation of stereophonic sound and/or the reproduction of sounds which appear to be perceived within a closed room giving the sensation of recording-hall acoustics and orchestra instrument location, as well as for particularly plastic and natural sound reproduction up to artificial head reproduction, is unrestrictedly suitable within all ranges and consequently constitutes a unique, distinctive, universal hi-fi sound reflection box that is independent of enclosed rooms or spaces.
This technical problem is solved by the features characterized in the claim 1.
Provision is made here that, opposite the loudspeaker(s), viewed in the direction of the sound projection, there is arranged a sound guide surface which distributes and deflects the impinging sound at least approximately uniformly, of a partial segment of a cylinder, a sphere or else two, preferably plane, sound guide surfaces which, in the manner of a ship's bow, are inclined towards one another at an obtuse angle and upon which, with or without a rigid connection, geometric bodies may be placed or inserted, wherein the angle bisector (reference angle bisector) located approximately at the center of the height or the width, respectively, of the sound guide surfaces, is directed at least approximately to the center of the loudspeaker(s) and/or the loudspeaker baffle, which is mounted in the direction of a predetermined sound distribution corner, this arrangement being surrounded by a sound guide compartment comprising several sound guide surfaces (top and terminal surfaces) which is provided with two sound emission apertures. In this arrangement, the loudspeaker or the sound source may also be formed by loudspeaker systems with
REFERENCES:
patent: 2038253 (1936-04-01), Wheeler et al.
patent: 2858899 (1958-11-01), Lopez-Henriquez
patent: 3263769 (1966-08-01), Mercurius
patent: 3642091 (1972-02-01), Nohara et al.
patent: 4227050 (1980-10-01), Wilson
patent: 4313521 (1982-02-01), Rodden
patent: 4593784 (1986-06-01), Flanders
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