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Infrared echo canceling

  • US 5,838,471 A
  • Filed: 06/27/1996
  • Issued: 11/17/1998
  • Est. Priority Date: 06/27/1995
  • Status: Expired due to Fees
First Claim
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1. An infrared data communications system comprising:

  • (a) an infrared data communications transceiver for transmitting and receiving infrared data signals;

    (b) an infrared data signal echo canceling system operatively integrated with said data communications transceiver for canceling reflections of the infrared data signals transmitted by said infrared data communications transceiver which are subsequently received by said infrared data communications transceiver, said infrared data signal echo canceling system including a pulse stretcher for increasing the pulse width of a version of the transmitted data signals for producing a pulse stretched version of the transmitted data signals; and

    (c) means for subtractively combining the pulse stretched version of the transmitted infrared data signals with the received infrared data signals such that the reflections of the transmitted infrared data signals subsequently received by said infrared data communications transceiver are removed from the received infrared data communications signal.

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