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. 09, 1996
Filed:
Jan. 31, 1995
Applicant:
Inventors:
Jacques Prado, Egly, FR;
Eric Moulines, Paris, FR;
Assignee:
France Telecom, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ; H04B / ;
U.S. Cl.
CPC ...
379410 ; 379406 ; 379411 ; 370 321 ;
Abstract
The forward signal is submitted to a finite-impulse-response linear-prediction filter in order to determine a first residual signal of minimal energy. The return signal is submitted to a finite-impulse-response filter the coefficients of which are the same as those of the linear-prediction filter of the forward signal in order to determine a second residual signal. The ratio of the energies contained in the first and second residual signals is calculated. It is determined whether the return signal contains components other than the echo components from the forward signal by comparing the calculated ratio to a detection threshold.