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:
Jan. 02, 1990
Filed:
Dec. 30, 1987
Applicant:
Inventors:
Assignee:
S.A.T. (Societe Anonyme de Telecommunications), Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
370 321 ; 379410 ;
Abstract
A terminal is provided for transmitting data over a bidirectional analog channel with echo cncellation coupled to the reception timing, wherein, between an emission circuit and a reception circuit coupled to a bidirectional line by a hybrid coupler, an echo canceller synthesizes an estimated echo from samples of an analog emitted signal, sampled at the same frequency as the received signal, the sampling frequency being controlled by the reception circuit, which is not synchronous with the emission circuit. Such a terminal requires no interpolation filter at the input of the reception circuit and makes possible optimum coupling of the echo canceller with an equalizer.