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Synchronous/asynchronous independent single sideband acoustic telemetry

  • US 4,432,079 A
  • Filed: 11/02/1981
  • Issued: 02/14/1984
  • Est. Priority Date: 11/02/1981
  • Status: Expired due to Fees
First Claim
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1. An improved apparatus for acoustically transmitting and receiving through a water medium comprising:

  • a first and a second source of modulating signals;

    a source of acoustic carrier signals;

    means coupled to the first and the second modulating signal sources for modulating carrier signals from the carrier signal source into upper and lower first modulating source sidebands and upper and lower second modulating source sidebands;

    means coupled to the modulating means for passing only the lower first-modulating-source sideband and the upper second-modulating-source sideband;

    means coupled to the passing means for transmitting acoustic signals representative of the lower first-modulating-source sideband and the upper second-modulating-source sideband through the water medium;

    means receiving remotely originating upper and lower sidebands of a single carrier frequency and upper and lower sidebands of a single carrier frequency along with the carrier frequency, each sideband modulated by discrete signals, for converting them to representative signals;

    means coupled to the converting means for filtering out an upper sideband of discretely modulated signals and a lower sideband of discretely modulated signals; and

    means for demodulating the upper sideband of discretely modulated signals into one source of information and the lower sideband of discretely modulated signals into another source of information.

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