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. 19, 1980
Filed:
Mar. 10, 1978
Fusao Ushio, Hirakata, JP;
Noboru Okuno, Sennan, JP;
Matsushita Electric Industrial Co., Ltd, Osaka, JP;
Abstract
A defect detecting apparatus for detecting a minor defect of a length in the order of a time period corresponding to one half cycle of a carrier included in a reproduced video signal which has been recorded in frequency modulation form or a defect of the reproduced signal due to irregular phase change of the carrier to correct the video signal is disclosed. The apparatus comprises a band-pass filter for extracting a spectrum component due to the defect distributed in a playback demodulator output frequency spectrum including a high-pass filter for attenuating a video signal component and a low-pass filter for attenuating a frequency-multiplied carrier component, and a level comparator which produces an output when an output level of the band-pass filter exceeds a predetermined level.