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:
Jun. 28, 1983
Filed:
Aug. 12, 1980
Tatsuo Fujiwara, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A carrier wave at a frequency higher than the frequency of an input signal to be recorded is pulse width modulated with the input signal at the pulse width modulator, and the modulated signal thus obtained is supplied to a vertical magnetization recording head. The vertical magnetization recording head is held in contact with a magnetic tape having a rectangular hysteresis characteristic, and the modulated signal is recorded by vertical magnetization recording on the magnetic tape. The signal recorded by the vertical magnetization recording is reproduced with a reproducing head having a high sensitivity reproducing characteristic with respect to the input signal component of the pulse width modulation signal recorded on the recording medium and a low sensitivity characteristic with respect to the carrier wave component of the modulation signal.