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Apparatus and method for the synchronization of data in a bit stream

  • US 5,588,030 A
  • Filed: 01/11/1996
  • Issued: 12/24/1996
  • Est. Priority Date: 10/13/1993
  • Status: Expired due to Fees
First Claim
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1. A method for detecting the beginning of data in a bit stream, wherein the bit stream comprises sequences of a preamble, byte synch and data, wherein the byte synch comprises an EOP bit sequence which identifies the end of the preamble and the beginning of the data, said method comprising the steps of:

  • determining a frequency and phase related to the bit stream for clock synchronization;

    wherein said step of determining is completed within an initial portion of a pattern of bits in the preamble, said pattern being a repetition of instances of a specific bit string having a bit with a first value and one or more bits having a different second value;

    performing EOP searches to detect a first occurrence of said EOP bit sequence in said bit stream, wherein at least one of said EOP searches commences at a first bit position within said bit stream, said first bit position separated by a second bit position from a third bit position at which a next EOP search is commenced, wherein no EOP search commences at said second bit position; and

    determining where the data begins in the bit stream using an EOP bit sequence detected in one of said EOP searches;

    wherein said step of performing EOP searches allows an EOP bit sequence to be used which is shorter than a bit sequence which would be required if an EOP search were commenced at said second bit position.

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