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. 19, 1980
Filed:
Feb. 03, 1978
Peter M Scott, Edinburgh, GB;
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An encoding circuit provides an improved interface code of the CMI (Code Mark Inversion) type for transferring binary information between different points within terminal stations for digital communication, such as telephone exchange stations. Encoded output signals, in the CMI format or code, are produced with respect to a clock related signal in a manner such that each positive or negative transition of the encoded output signals occur at the end or at the beginning of a data bit period of the output signals, irrespective of whether the binary value of the input signals to be encoded is 0 or 1. Signal trailing edges, which are to be used for clock recovery by a subsequent decoder, are triggered by clock pulses, and are not derived from different signal channels of the encoding circuitry which, typically, would have made the relative phasing of the signals in the channels critical.