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. 17, 1991
Filed:
Apr. 13, 1990
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358336 ; 358314 ; 360 381 ;
Abstract
A drop-out detecting circuit forms a drop-out detecting signal on the basis of the result of comparing the frequency of a frequency modulated video signal reproduced from a slant track on a magnetic tape with a reference frequency. The level of a reproduction state detecting signal formed on the basis of the envelope of the reproduced frequency modulated video signal is compared with a predetermined level and the above reference frequency is varied on the basis of the compared result.