Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1977-10-25
1978-07-18
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181151, H04R 128
Patent
active
041017366
ABSTRACT:
The present invention is a device for use in combination with a loudspeaker system, that includes a speaker enclosure, in order to effectively enlarge the volume of the speaker enclosure. The loudspeaker system also includes a vibratable cone. The device for effectively enlarging the volume of the speaker enclosure includes a gas having a gamma less than 1.4 and the product of its density and the square of the speed of sound therein less than the same product for air and a bag which is formed from a soft, pliable material for enclosing the gas within the speaker enclosure and which is adapted to seal the gas therein. The device also includes an acoustically transparent and porous cocoon which is disposed about the bag so that it surrounds completely the bag and an acoustical padding which is disposed adjacent to the sidewalls of the speaker enclosure and which is adapted to enclose the acoustically transparent and porous cocoon. The device may also include a device for generating the gas by heating a fluid in its liquid phase so that the fluid changes to its gas phase. The device for heating the fluid may either be a resistive electrical element which is disposed within the speaker enclosure or fibrous, sound absorbent material which is disposed within the bag. The device is placed in the speaker enclosure in back of the vibratable cone in order to increase the compliance that the vibratable cone sees.
REFERENCES:
patent: 2718931 (1955-09-01), Boudouris
patent: 3385929 (1968-05-01), Magyar et al.
patent: 4044855 (1977-08-01), Kobayashi
Cerwin Vega, Inc.
Johansen W. Edward
Stellar George G.
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