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:
Apr. 29, 2003
Filed:
Aug. 03, 1998
Kotaro Takagi, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A digital communication apparatus in which a QPSK signal is received and frequency-converted to an intermediate frequency signal, the intermediate frequency signal is subjected to A/D conversion and separation into an I-component and a Q-component to obtain I-component and Q-component digital data, and the original digital data is obtained from the I-component and Q-component digital data. The digital commumication apparatus has an A/D converter circuit for performing the above-mentioned A/D conversion, a level control circuit for controlling the level of a signal supplied to the A/D converter circuit to a predetermined value, and a disturbance signal level detection circuit for detecting the disturbance signal level contained in the received signal.