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Method and system for sample and reconstruction synchronization for digital transmission of analog modem signal

  • US 7,280,593 B2
  • Filed: 09/26/2006
  • Issued: 10/09/2007
  • Est. Priority Date: 07/02/2001
  • Status: Expired due to Fees
First Claim
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1. A method of synchronizing a reconstruction of analog modem signals at a remote bridging device, comprising the steps of:

  • receiving, at a first bridging device, a first analog signal;

    generating, at said first bridging device, by a first analog-to-digital converter, a first digital data signal from said first analog signal, wherein;

    said first analog-to-digital converter is synchronized by a first sample clock signal; and

    ,said first digital data signal comprises a first sample synchronization signal and first digital information bits, said first sample synchronization signal comprising a digital marker representing sample timing information;

    transmitting, from said first bridging device, said first digital data signal;

    receiving, at a second bridging device, said first digital data signal from said first bridging device via a transmission medium;

    detecting said first sample synchronization signal by said second bridging device;

    generating, at said second bridging device, a first reconstruction clock signal based on said first sample synchronization signal;

    converting, at said second bridging device, by a second digital-to-analog converter, said first digital data signal to a reconstruction of said first analog signal, wherein said second digital-to-analog converter is synchronized by said first reconstruction clock signal;

    receiving, at said second bridging device, a second analog signal;

    converting, at said second bridging device, by a second analog-to-digital converter, said second analog signal to a second digital data signal, wherein said second analog-to-digital converter is synchronized by said first reconstruction clock signal;

    transmitting, from said second bridging device, said second digital data signal via said transmission medium;

    receiving, at said first bridging device, said second digital data signal; and

    ,converting, at said first bridging device, by a first digital-to-analog converter, said first digital data signal to a reconstruction of said second analog signal, wherein said first digital-to-analog converter is synchronized by said first sample clock signal.

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