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High speed modem suitable for operating with a switched network

  • US 4,206,320 A
  • Filed: 08/21/1978
  • Issued: 06/03/1980
  • Est. Priority Date: 08/21/1978
  • Status: Expired due to Term
First Claim
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1. A modulator-demodulator for the transmission and reception of information adapted for efficient information transmission through a switched network and for reducing the effects of distortions produced by the unknown characteristics of the transmission medium, said modulator comprising:

  • means for generating representation of plurality of synchronous information sub-carriers, each of said information sub-carriers harmonically related to a fundamental f0,means for assembling information for transmission into a plurality of separate information portions, equal in number to the number of information sub-carriers,means for modulating each representation of an information sub-carrier with a different information portion,means for transmitting representation of said modulated information sub-carriers for a period TB wherein TB >

    TO =1/f0,said demodulator adapted for connection to a transmission medium and responsive to signals received therefrom said demodulator comprising;

    first means for generating representations of a plurality of corresponding information sub-carriers each nominally of frequency equal to the frequency of said plurality of information sub-carriers,correlating means for correlating said signal received from said transmission medium with representations of each of said corresponding information sub-carriers for a period T0 <

    TB, anddecoding means responsive to said correlating means for detecting the information portion originally modulating said information sub-carriers.

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