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:
Aug. 10, 1982
Filed:
Nov. 21, 1979
Yasushi Ohtake, Tokorozawa, JP;
Tsunao Hasegawa, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A method and an apparatus for detecting and automatically setting optimum recording bias in a tape recorder in which first and second test signals of low and high audio frequencies, respectively, are alternately recorded on a recording medium. While these are being recorded, the recording bias applied to the recording medium is varied in a plurality of steps between upper and lower limits. The tape is then rewound and the reproduced first and second signals are compared to determine at which recording bias step the reproduced levels of the first and second signals are equal to one another. The recording bias for normal recording is then set in accordance with the bias level present at the selected step.