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:
Feb. 21, 1984
Filed:
Oct. 13, 1981
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A reference signal detection circuit in a rotary recording medium reproducing apparatus has a reproducing transducer for reproducing an information signal recorded in a rotary recording medium and reference signals for tracking servo recorded for every predetermined period, from the rotary recording medium rotating at a predetermined rotational speed, and a tracking servo circuit for obtaining a tracking servo signal from the reference signals and performing a tracking servo operation according to the tracking servo signal thus obtained. The detection circuit further comprises a single rectifying and smoothing circuit for rectifying and smoothing the reproduced reference signals obtained for every predetermined period. The detection circuit has a lowpass filter characteristic wherein the cutoff frequency is within a frequency range between one third and twice the gain crossover frequency of the tracking servo loop.