The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1986
Filed:
Dec. 10, 1984
Crosfield Electronics Limited, London, GB;
Abstract
A method and apparatus for detecting digital codewords or predetermined portions of digital codewords in a stream of codewords is described. The apparatus comprises a shift register (21) having a length at least one bit greater than the length of the longest codeword or predetermined codeword portion to be detected; and means including an inverter (24) for loading the shift register (21) with the logical complement of the leading bit of the stream of codewords. A clock (25) is provided to cause data in the data stream to be serially shifted into the shift register (21). The contents of the shift register after each shift are then used to address one or more PROMs (26) to determine whether the data in the shift register (21) upstream of the first change between data in the shift register of one type and data in the shift register of the complementary type comprises a codeword or a predetermined codeword portion.