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Methods and apparatus for use in generating and transmitting acoustic signals

  • US 4,207,962 A
  • Filed: 07/03/1978
  • Issued: 06/17/1980
  • Est. Priority Date: 07/03/1978
  • Status: Expired due to Term
First Claim
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1. For use in the transmission of a train of repetitive or quasirepetitive acoustic signals into a medium of finite tensile strength in response to an input control signal, the method of minimizing the negative dynamic pressure or stress excursions of said acoustic signals with respect to the average pressure or stress present in the absence of said signals and enabling the maximization of the power of said transmission in a given frequency band, said method comprisingcontacting said medium with a movable member, andapplying in direct response to said control signal forces to said member in opposite directions with respect to the average force on said member due to said average pressure or stress to place said medium alternately under compressive and tensile forces with the time duration of the application of the compressive force short compared with the time duration of the application of the tensile force and with the waveform of said tensile forces being approximately rectangular in shape, said compressive force time duration being in excess of one-half period of the upper frequency limit of said frequency band, the lower frequency limit of said band being approximately the repetition frequency of said train of repetitive or quasirepetitive acoustic signals.

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