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:
Dec. 18, 1984
Filed:
Sep. 13, 1982
Applicant:
Inventors:
Bruce B Lusignan, Palo Alto, CA (US);
Hamid Najafi, Palo Alto, CA (US);
Assignee:
The Board of Trustees of the Leland Stanford, Junior University, Palo Alto, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H04B / ;
U.S. Cl.
CPC ...
1771702 ; 179 / ; 330 10 ; 375-8 ; 375 22 ;
Abstract
A telephone line interface which performs the BORSHT functions employs pulse width modulation and eliminates dc in the transformer to reduce the size of the coupling transformer thereby reducing space and costs. The ring function is provided to the subscriber without use of mechanical relays. An automatic, dynamically adjusted hybrid network is provided for removing echo signals thereby providing major improvement in two-to-four wire conversion performance. The circuitry lends itself to large scale integration thereby reducing space and cost and improving reliability.