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. 03, 1987
Filed:
Nov. 01, 1985
Kohei Sasamura, Sagamihara, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A tracking control system comprises a capstan motor for moving a magnetic tape which is at least recorded with an FM signal and a control signal having a constant period, a driving circuit for generating a signal which drives the capstan motor, a control head for reproducing the control signal from the tape in a reproducing mode, heads for reproducing the FM signal from the tape in the reproducing mode, a tracking adjuster for generating a comparison signal, a phase comparator for comparing phases of the reproduced control signal with the comparison signal and for generating a phase error signal which is supplied to the driving circuit to control the driving circuit, a sampling circuit for sampling a signal which is based on the reproduced FM signal with a preset sampling interval, a discriminating circuit for discriminating levels of sampled data obtained from the sampling circuit, and a circuit for generating a control signal based on a discriminated result in the discriminating circuit and for supplying the control signal to the tracking adjuster to automatically and variably control a duty cycle of the comparison signal so that an envelope level of the reproduced FM signal becomes a maximum.