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. 05, 1989
Filed:
Dec. 28, 1987
Applicant:
Inventor:
Shin-ichi Wakumura, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 51 ; 360 60 ;
Abstract
In a magnetic recording and reproducing circuit, a PLL circuit extracts a clock signal from the input signal while a clock generating circuit outputs a clock signal independently of the input signal, and one of the clock signals thus obtained is applied to a signal processing circuit depending on whether or not the PLL is in a locked state. When the PLL circuit is not in a locked state, the independently generated clock signal is used, and the processing circuit outputs data substantially at zero level, whereby the recording of noises on the magnetic tape is prevented.