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:
Apr. 25, 1978
Filed:
Feb. 28, 1977
Adam Lender, Palo Alto, CA (US);
GTE Automatic Electric Laboratories Incorporated, Northlake, IL (US);
Abstract
Apparatus and method for generating a multilevel correlative signal wherein the multiple levels are digitally generated. A serial binary bit stream is first converted into two parallel binary bit streams each at half the bit rate of the original serial binary bit stream. The parallel bit streams are encoded in accordance with the relation B = C - .DELTA..sup.2 C MOD 4; where B is the original waveform, C is the resultant waveform, and .DELTA..sup.2 indicates two units delay or 2T seconds where 1/T is the parallel speed in digits per second. Next the binary encoded bit streams are digitally converted to a 7-level waveform; and, finally the 7-level waveform is transformed into an analog signal which retains the 7-levels and provides a band limited 7-level signal related on a one-to-one basis to the binary input signal.