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. 02, 1986
Filed:
Jun. 11, 1984
Toshihiko Ryu, Tokyo, JP;
Shoichi Mizoguchi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In an equalizer for equalizing, by the use of zero forcing algorithm, an input signal obtained by modulating a carrier wave of a carrier frequency at a modulation rate, a specific one of complex control signals is modified into a modified complex signal and supplied to a specific one of gain control circuits of a transversal filter corresponding to a specific one of additional taps except a central tap. The modified complex signal is produced by rotating a phase of the specific complex control signal by a step equal to an integral multiple of .pi./2. Specifically, at least one of real and imaginary parts of the modified complex signal is inverted relative to those of the specific complex control signal. The real and the imaginary parts of the modified control signal are delivered to in-phase and quadrature portions of the specific gain control circuit in consideration of the step.