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:
Mar. 28, 2000
Filed:
Dec. 05, 1997
Masataka Wakamatsu, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
Upon the power-on, a digital signal processing circuit supplies an AGC signal to an AGC amplifier to squelch it substantially, thereby prohibiting an analog signal from being input to an A/D converter 6 via a DC level setting circuit. In this state, a DC level that is set by the DC level setting circuit is A/D-converted by the A/D converter and a resulting value is input to the digital signal processing circuit. The digital signal processing circuit calculates and stores, as a DC offset value, a difference between the received DC level and the center value of the dynamic range of the A/D converter. In a stationary state, the AGC amplifier is caused to operate normally and the offset value is subtracted from data that is supplied from the A/D converter. Resulting data is output from an output terminal.