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. 31, 1989
Filed:
Dec. 15, 1986
Hideo Ashida, Otawara, JP;
Fujutsu Limited, Kawasaki, JP;
Abstract
A modulation device using multi-level digital signals includes: a pair of balanced mixers for carrying out quadrature amplitude modulation to deliver a quadrature amplitude modulated signal; input and output hybrid circuits, connected to carrier input terminals of the pair of balanced mixers, for supplying carrier inputs to the pair of balanced mixers; and a modulation characteristic compensation unit connected with input terminals of the pair of balanced mixers for supplying the pair of balanced mixers with orthogonal baseband input signals. A demodulation device with a use of multi-level digital signals including: a pair of balanced mixers for carrying out quadrature amplitude demodulation to deliver a pair of quadrature amplitude demodulated signals; first and second input hybrid circuits; and a demodulation characteristic compensation unit connected with output terminals of the pair of balanced mixers for deriving demodulation characteristic compensated orthogonal baseband signals from the pair of quadrature amplitude demodulated signals.