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. 02, 1982
Filed:
Dec. 26, 1979
David H Chung, Palo Alto, CA (US);
Other;
Abstract
A method and apparatus for encoding and decoding digital information upon a recording medium using the time interval between adjacent pairs of pulses. A number 'n' of unique time intervals between pulse pairs correspond to 'n' unique symbols contained within a coding table. Assignment of the durations between pulses adapted to the frequency of occurrence of particular symbols within a data stream materially increases the efficiency of the method. Division of the data stream and numerical transformation of the data stream improve the efficiency of adaptive assignment of the durations between pulses on the basis of frequency of occurrence of particular symbols within a data stream. The method realizes a multiple-fold increase in data storage capacity of rotating magnetic disk memories over common MFM encoding, and the method similarly realizes a multiple-fold increase in data transfer rate for telecommunications applications.