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. 01, 2009
Filed:
Sep. 07, 2004
Yuji Kasai, Tsukuba, JP;
Masahiro Murakawa, Tsukuba, JP;
Tetsuya Higuchi, Tsukuba, JP;
Abstract
A transmitting circuitconverts transmission data to a multilevel analog signal suitable for transmission. The multilevel analog signal is output to a cablevia an amplifier and a hybrid circuit. In the transmitting circuit, a waveform which compensates waveform deterioration at the cableis generated. A reception signal from the cableis input to a mixervia the hybrid circuitand an amplifier. The mixermixes the reception signal and a cancel signal output from a cancel signal generation circuitso as to remove undesired signals. In a receiving circuit, the signal output from the mixeris sampled by use of a plurality of sample-hold circuits, and subjected to analog sum-of-product computation which is performed by a matrix circuit for distortion compensation. Subsequently, the sampled signals are converted to digital signals. The digital signals are collectively subjected to processing such as parallel-serial conversion, whereby reception data and an evaluation signal are obtained. An adjustment control circuitincludes a CPU, and adjusts the respective circuits on the basis of the evaluation signal such that data can be correctly transmitted and received.