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:
Dec. 02, 2003
Filed:
May. 15, 2002
Toru Ohashi, Kawagoe, JP;
Pioneer Corporation, Tokyo-To, JP;
Abstract
A digital filter for forming a feedback path including a delay unit, applying a filter operation to an input signal, giving a frequency characteristic having a predetermined time constant, and generating an output signal, is provided with: a selector having a multiplier for implementing time constants in at least two stages, and selecting the connection of the multiplier corresponding to a preset time constant to perform time constant switching; a timing generator for determining the timing when the time constant switching is performed by the selector; and a correction device for correcting the output of the delay unit to suppress variations in the output signal in the determined timing.