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:
Sep. 04, 2001
Filed:
Jun. 02, 1999
Applicant:
Inventor:
Shigeji Ikeda, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03B 2/900 ;
U.S. Cl.
CPC ...
H03B 2/900 ;
Abstract
A signal-to-noise power ratio estimation circuit,detects an error signal power of an error signal output from a subtracter,and a pseudo noise signal power of a pseudo signal output from an adaptive filter,and, based on the detected signal powers, outputs an estimated value SNR1 of a signal-to-noise power ratio. An SNR average circuit,calculates an average value SNR4 of the SNR1. A step size output circuit,controls the step size of the adaptive filter,according to the SNR4 value.