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Method and apparatus for transmitting intelligence over a carrier wave

  • US 4,218,655 A
  • Filed: 12/14/1977
  • Issued: 08/19/1980
  • Est. Priority Date: 07/17/1974
  • Status: Expired due to Term
First Claim
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1. A method for digitally transmitting intelligence in which a carrier wave having a predetermined function is modified while the carrier wave is performing the predetermined function and without impairing the function, said method comprising the steps of:

  • 1. combining a signal wave with the carrier wave by adding the signal wave to the carrier wave to produce a composite wave having a recognizable pattern of variations in the durations of the intervals defined by preselected locations in the composite wave without impairing the function of the carrier wave, said pattern of variations in the durations of the intervals representing at least a portion of the digital intelligence to be transmitted; and

    ,2. extracting from the composite wave the digital intelligence represented by the pattern of variations in interval durations therein.

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