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Redundant word frame synchronization circuit

  • US 4,344,180 A
  • Filed: 06/19/1980
  • Issued: 08/10/1982
  • Est. Priority Date: 06/19/1980
  • Status: Expired due to Term
First Claim
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1. A frame synchronization arrangement for use in a data communication system, said communication system arranged to transit data words in a frame format including first and second identical data words having a first bit separation therebetween, said first data word having a second bit separation from a data frame boundaryCHARACTERIZED IN THATsaid frame synchronization arrangement comprises:

  • means for serially storing a number of successive data words including the data word immediately following said data frame boundary and said first and second identical data words for a preselected time and then serially outputting all of said stored data words except said second identical data word; and

    means for comparing data words in said storing means having both said first bit separation therebetween and said second bit separation to said data frame boundary and generating a valid comparison signal therefrom when the compared data words are the same, which valid comparison signal enables the serial outputting of data words from said storing means and is synchronous with the outputted data word immediately following said data frame boundary.

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