Acoustics – Plural diaphragm sound sources
Reexamination Certificate
1998-12-11
2001-02-13
Dang, Khanh (Department: 2837)
Acoustics
Plural diaphragm sound sources
C181S153000
Reexamination Certificate
active
06186269
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to loudspeakers which process input signals and project corresponding sound outputs to a listening audience. In particular, the invention sets forth a loudspeaker which propagates coherent sound waves in the manner of a point source.
2. Description of the Prior Art
Standard loudspeakers are generally constructed to include two or more sound drivers to reproduce relatively high, medium, and low frequency sound ranges. These typical loudspeakers are arranged such that their sound drivers face the audience. This produces sound which propagates in the form of a wedge. Sound thus created is noncoherent and has distorted stereo resolution, and loses true audible frequency spectrum which is received and interpreted by the human ear.
Applicants are unaware of prior art patents which describe the instant invention as claimed.
SUMMARY OF THE INVENTION
The present invention sets forth a loudspeaker which utilizes a relatively low range driver, preferably one which generates sound in the band known as midrange or low range, and a relatively high frequency driver. The novel loudspeaker is configured to propagate coherent sound waves spherically in a time and phase relationship omnipresently from a virtual point source. The loudspeaker achieves these goals while being miniature in size, compared to conventional speakers.
The midrange driver is arranged to project sound downwardly into a ported cylindrical housing. The high frequency driver is arranged to project sound upwardly out of the housing. The bottom of the housing is closed. The low frequency driver divides the housing into two sound propagating chambers. That chamber receiving sound projected from the low frequency driver is ported to discharge sound. The sound drivers are coaxially oriented within the housing.
A crossover network is located at the bottom of the lower sound chamber. The crossover network is operably connected to the sound drivers. Input terminals connected to the crossover network are mounted to the housing on a lateral, exterior surface.
Accordingly, it one object of the invention to provide a speaker which propagates coherent sound waves spherically in the manner of a virtual point source.
It is another object of the invention that the novel speaker be of compact size.
It is a further object of the invention to have a crossover network operably connected to the sound drivers.
Still another object of the invention is that the housing be cylindrical.
An additional object of the invention is to provide two sound propagating chambers.
A further object of the invention is that input terminals be located on a lateral, exterior surface of the loudspeaker.
Yet another object of the invention is that the sound drivers be coaxial.
Still another object of the invention is that the sound drivers be oriented to project sound in opposite directions.
It is an object of the invention to provide improved elements and arrangements thereof in an apparatus for the purposes described which is inexpensive, dependable and fully effective in accomplishing its intended purposes.
These and other objects of the present invention will become readily apparent upon further review of the following specification and drawings.
REFERENCES:
patent: 3326321 (1967-06-01), Valuch
patent: 4580654 (1986-04-01), Hale
patent: 5847331 (1998-12-01), Vollmer et al.
Hart Teresa
Vollmer Edward
Dang Khanh
Siemens Patent Services LC
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