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:
Apr. 18, 1989
Filed:
Dec. 20, 1985
Nobuyoshi Okumura, Kyoto, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A magnetic recording and reproducing device and method, the device including rotary heads, a pilot signal generating circuit for generating pilot signals different in frequency in synchronization with a change-over signal for the rotary heads. Also included are an adder for superposing the pilot signals on a video signal and applying the resultant signals to the rotary heads, a first switch for stopping the delivery of the pilot signals for a predetermined period of time in a temporary recording stop mode, and a second switch for switching the operation mode of the rotary heads from a recording mode over to a reproducing mode so that, after the first switch has stopped the delivery of the pilot signals, the delivery of signals from the adder is stopped. Further included are a pilot signal extracting circuit for extracting a reproduced pilot signal reproduced from the magnetic tape, and a magnetic tape running control circuit which, after the second switch switches the operation mode of the rotary heads, rewinds the magnetic tape by a predetermined lenght, stops the tape, and controls the running of the tape in the forward direction so that the frequency of the pilot signal from the pilot signal extracting circuit coincides with that of the pilot signal from the pilot signal generating cirucit, in a temporary recording stop removal mode. A pilot signal discriminating circuit is also included for switching the operation mode of the second switch from a reproducing mode over to a recording mode when the level of the pilot signal from the pilot signal extracting cirucit is lower than a predetermined value.