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. 12, 1995
Filed:
May. 06, 1994
Sony Corporation, Tokyo, JP;
Abstract
The characteristic of a regenerative signal from a magnetic head 11 is compensated by a filter 14 serving as an equalizer. The regenerative signal thus compensated is then decoded at a decoder 15. An adaptive control unit 17 adjusts (modifies) the characteristic of the filter 14 on the basis of a decode error (residual) at the decoder 15 and an input to the filter 14. A servo control unit 18 sends a servo lock signal to the adaptive control unit 17 when a servo control operation at the time of reproduction is stabilized to start an automatic adjustment operation of the filter characteristic. Thus, it is possible to prevent in advance bad influence or effect on a compensating operation of the equalizer resulting from the fact that an adaptive adjustment operation of the filter characteristic might be carried out at the time when the servo control operation is unstable like at the time of building up of a reproducing operation.