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. 10, 1996
Filed:
Aug. 05, 1994
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
Method and apparatus automatically select, in a playback mode, a noise reduction circuitry of a noise reduction system by which a middle-to-high frequency signal of a low level included in a recording signal is compressed in dynamic range for recording and the compressed middle-to-high frequency signal is expanded in dynamic range in the playback mode, thereby suppressing middle to high frequency noises in the reproduction signal. A level difference .DELTA.L between the maximum and minimum signals of the low frequency component in the reproduction signal and a level difference .DELTA.H between the maximum and minimum signals of the middle-to-high frequency component in the reproduction signal are obtained. While comparing the magnitudes of the two level differences obtained, the selection of an appropriate noise reduction circuitry is performed so that the two level differences are made almost equal to each other.