Acoustic system
First Claim
1. An acoustic system comprising in combination:
- an enclosure;
a speaker acoustically connected to said enclosure, for generating two sound waves, a forward sound wave, and a rearward sound wave;
a waveguide formed at least partly within said enclosure, and acoustically connected to said speaker, for defining an acoustic path along which said rearward sound wave travels;
said waveguide including a plurality of inner panels positioned inside said enclosure for lengthening the length of said travel path;
said plurality of inner panels and said enclosure defining a plurality of inner passageways, and a plurality of inner openings, for causing a selective cancellation of said rearward sound wave traveling along said acoustic path at predetermined frequencies, while allowing sound waves at other frequencies to propagate with minimal attenuation;
wherein said enclosure includes an output port through which said rearward sound traveling along said acoustic path exits;
wherein said speaker has a piston area SD ;
wherein the surface area of said output port is equal to a portion of said piston area SD ;
wherein said waveguide and said enclosure define a first compartment adjacent to said speaker;
wherein said first compartment has a predetermined volume;
wherein said speaker has a rear surface, at least partly enclosed within said first compartment; and
wherein said volume loads said rear surface of said speaker with back pressure, in order to reduce a cone excursion of said speaker.
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Accused Products
Abstract
The present acoustic system produces sounds over a broad range of frequencies, and includes an enclosure, a speaker acoustically connected to the enclosure, for generating, almost simultaneously, two sounds, a forward sound, and a rearward sound. It further includes a waveguide enclosed at least partly within the enclosure, and acoustically connected to the speaker, for defining an acoustic path along which the rearward sound travels. The waveguide includes a plurality of inner panels that are positioned inside the enclosure for optimizing the length of the travel path. The inner panels and the enclosure define a plurality of inner passageways having generally similar cross-sectional surface areas, and a plurality of inner openings, for causing a selective cancellation of sounds at predetermined frequencies, while preserving sounds at other frequencies.
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Citations
19 Claims
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1. An acoustic system comprising in combination:
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an enclosure; a speaker acoustically connected to said enclosure, for generating two sound waves, a forward sound wave, and a rearward sound wave; a waveguide formed at least partly within said enclosure, and acoustically connected to said speaker, for defining an acoustic path along which said rearward sound wave travels; said waveguide including a plurality of inner panels positioned inside said enclosure for lengthening the length of said travel path; said plurality of inner panels and said enclosure defining a plurality of inner passageways, and a plurality of inner openings, for causing a selective cancellation of said rearward sound wave traveling along said acoustic path at predetermined frequencies, while allowing sound waves at other frequencies to propagate with minimal attenuation; wherein said enclosure includes an output port through which said rearward sound traveling along said acoustic path exits; wherein said speaker has a piston area SD ; wherein the surface area of said output port is equal to a portion of said piston area SD ; wherein said waveguide and said enclosure define a first compartment adjacent to said speaker; wherein said first compartment has a predetermined volume; wherein said speaker has a rear surface, at least partly enclosed within said first compartment; and wherein said volume loads said rear surface of said speaker with back pressure, in order to reduce a cone excursion of said speaker. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An enclosure for use with a speaker, the enclosure comprising in combination:
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the speaker being acoustically connected to said enclosure, for generating two sound waves, a forward sound wave, and a rearward sound wave; a waveguide formed at least partly within said enclosure, and acoustically connected to the speaker, for defining an acoustic path along which said rearward sound wave travels; said waveguide including a plurality of inner panels positioned inside said enclosure for lengthening the length of said travel path; said plurality of inner panels and said enclosure defining a plurality of inner passageways, and a plurality of inner openings, for causing a selective cancellation of said rearward sound wave traveling along said acoustic path at predetermined frequencies, while allowing sound waves at other frequencies to propagate with minimal attenuation; wherein said enclosure includes an output port through which said rearward sound traveling along said acoustic path exits; wherein said waveguide and said enclosure define a first compartment adjacent to the speaker; wherein said first compartment has a predetermined volume; wherein the speaker has a rear surface, at least partly enclosed within said first compartment; and wherein said volume loads the rear surface of the speaker with back pressure, in order to reduce a cone excursion of the speaker.
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19. A method for producing sounds over a broad range of frequencies using a speaker, the method comprising the steps of:
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acoustically connecting the speaker to an enclosure for generating two sound waves, a forward sound wave, and a rearward sound wave; forming a waveguide including a plurality of inner panels, at least partly within said enclosure, and acoustically connecting said waveguide to speaker for defining an acoustic path along which said rearward sound wave travels; positioning said plurality of inner panels inside said enclosure for lengthening the length of said travel path; said plurality of inner panels and said enclosure defining a plurality of inner passageways, and a plurality of inner openings, for causing a selective cancellation of said rearward sound wave traveling along said acoustic path at predetermined frequencies, while allowing sound waves at other frequencies to propagate with minimal attenuation; wherein said enclosure includes an output port through which said rearward sound traveling along said acoustic path exits; wherein the speaker has a piston area SD ; wherein the surface area of said output port is equal to a portion of said piston area SD ; wherein said waveguide and said enclosure define a first compartment adjacent to the speaker; wherein said first compartment has a predetermined volume; wherein the speaker has a rear surface, at least partly enclosed within said first compartment; and wherein said volume loads said rear surface of the speaker with back pressure, in order to reduce a cone excursion of the speaker.
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Specification