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Broadband acoustical transmitting system

  • US 5,821,470 A
  • Filed: 04/08/1997
  • Issued: 10/13/1998
  • Est. Priority Date: 04/08/1997
  • Status: Expired due to Term
First Claim
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1. An acoustical transmitter apparatus for a broadband acoustical transmitting system which is operative to project acoustic energy in a directional polar pattern over an operating frequency range which includes a defined low frequency range, said acoustical transmitter apparatus comprisinga reflector dish having a front concave reflecting surface and a forward radiant axis,first acoustical transducer means for producing acoustic energy within the operating frequency range of the transmitting system, said first acoustical transducer means being operatively positioned in spaced relation in front of the concave reflecting surface of said reflector dish for directing acoustic energy produced thereby toward said reflecting surface, and said reflecting surface being operative to reflect acoustic energy received from said first acoustical transducer means in a directional polar pattern about said forward radiant axis, andsecond acoustical transducer means positioned in close proximity to said reflector dish for producing acoustic energy which is emitted from the reflecting surface thereof in a polar pattern about the dish'"'"'s forward radiant axis, said second acoustical transducer means being operative to produce acoustic energy in the low frequency range of the transmitting system such that the acoustic energies produced by said first and second transducer means combine and interact to produce a composite polar pattern about said forward radiant axis within the low frequency range of the transmitting system, whereby enhanced directionality within such low frequency range can be achieved.

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