Title: Error detector for modified duobinary signals

Abstract: A modified duobinary signal is separated into two (odd and even) pulse trains, each of which is representative of a bipolar pulse train. Each representative bipolar pulse train has a bit rate one-half that of the modified duobinary signal. Violations of the modified duobinary coding rules appear as violation of the bipolar coding rules. The bipolar violations which occur are detected separately for the odd and even pulse trains. The detected errors are read into an error combiner and are read out serially at the original modified duobinary bit rate.

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Inventors: Lender, Adam (Palo Alto, CA, US)

Application Number: 742168
Filing Date: 1976-11-15
Publication_date: 1978-04-25
Assignee: GTE Automatic Electric Laboratories Incorporated (Northlake, IL)
Primary Class(es): 714/810 375/291
Other Classes:
US Patent Ref:

3337864	Aug, 1967	Lender	340/146.
3343125	Sep, 1967	Lender	340/146.
3418631	Dec, 1968	Sipress et al.	340/146.
3461426	Aug, 1969	Lender	340/146.

Other Refs:
Primary Examiner: Atkinson, Charles E.
Assistant Examiner:
Attorney: Cool; Leonard R., Cannon; Russell A.