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:
Jun. 27, 1978
Filed:
Dec. 29, 1975
Noriaki Fujimura, Tokyo, JA;
Fujitsu Limited, Kawasaki, JA;
Abstract
Apparatus and method for use in a suppressed carrier data transmission system for automatically compensating for static and dynamic variations in the phase and amplitude characteristics of the transmission channel, including the phase variations of the locally-generated carrier signal, to minimize distortion of the data signals. A transversal filter receives and filters the baseband data signal and the thus filtered data signal is compensated for its dynamic distortion by a compensation network. A decision circuit generates an output code group for each successive data period and an error signal is derived therefrom. The error signal is separated into a steady state component and a dynamic component; the steady state component utilized to control the transversal filter tap gain to minimize such component, and the dynamic component utilized to control the compensating network to minimize such component. The invention is implemented as an analog circuit and, additionally, as a digital processing circuit.