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Acoustic system

  • US 5,821,471 A
  • Filed: 11/30/1995
  • Issued: 10/13/1998
  • Est. Priority Date: 11/30/1995
  • Status: Expired due to Fees
First Claim
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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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