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:
Nov. 21, 1989
Filed:
May. 31, 1988
Kamal E Dimitri, Tucson, AZ (US);
Martin A Hassner, Palo Alto, CA (US);
Paul H Siegel, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Uncompressed data is represented in a constrained code for transmission through a channel which may include record media. A d,k code having a code rate of m/n is employed. 'd' represents the minimum number of successive zeros in the channel code while k represents the maximum number of zeros in the channel code. 'n' is an integer representing the number of code bits in a channel group. The encoding and decoding follows a sliding block coding and decoding algorithm. In the channel coding, the number of successive ones is limited to being not less than two, in some coding it can be a value of d-1. The modification of the d,k code results in decreasing error propagation while increasing the recorded information density. This increase is achieved by increasing the channel code dictionary.