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:
Mar. 22, 1994
Filed:
Jun. 03, 1991
Applicant:
Inventor:
Johann Pfeiffer, Vienna, AT;
Assignee:
Schrack Telecom-Aktiengesellschaft, Vienna, AT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ; H04C / ;
U.S. Cl.
CPC ...
375-8 ; 375 17 ; 379 93 ; 370 321 ;
Abstract
The present invention relates to a method of using a modem for processing signals for signal transmission in the base band on a two-wire line. In order to reduce coupling to adjacent channels in the two-wire line, and to reduce effective line attenuation, it is proposed that the signal that is to be transmitted in a process of the above type be encoded such that each three transmit bits are combined to form a tri-bit, and one of eight discriminable sender levels for a main data channel are associated with each tri-bit, whereby the modulation rate of the symbols on the line is reduced to one-third of the bit rate.