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:
Feb. 22, 2000
Filed:
Jul. 23, 1997
Martin H Graham, Berkeley, CA (US);
Tut Systems, Inc., Pleasant Hill, CA (US);
Abstract
A binary data encoding and decoding technique that alternates between starting polarities of a signal for both each occurrence of a binary 1 and each occurrence of two or more consecutive binary 0's. To encode a binary 1, the signal is one polarity for one-half of a bit interval and then the other polarity for the other half of the bit interval. To encode a binary 0, the signal remains at a zero level, unless there are two or more consecutive binary 0's, in which case the signal will be one polarity for the second half of the first binary 0 bit interval, the other polarity for the first half of the second binary 0 bit interval, and repeat this waveform for every for every two adjacent binary 0's. Decoding occurs by examination of either the signal level as compared to predetermined cut-levels, or the time equivalent distance between the peaks. In the first case, if the signal is above the upper cut-level or below the lower cut-level, a binary 1 is decoded; if it is between the upper cut-level and the lower cut-level a binary 0 is decoded. Alternatively, every occurrence of a peak is decoded as a binary 1 and the number of binary 0's between these binary 1's is determined by the time equivalent distance between peaks.