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:
Jul. 20, 1982
Filed:
Jan. 15, 1981
Applicant:
Inventor:
Ellis K Cave, Garland, TX (US);
Assignee:
TBS International, Inc., Richardson, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 40 ; 360 46 ;
Abstract
A method and apparatus are disclosed for recording digital data on magnetic tape with an audio recorder. A logic circuit receives the data to be recorded and outputs two sequences of high and low levels: one sequence directly corresponds to the data and the other inversely corresponds to the data. One sequence is first inverted with respect to the other and the two sequences are then combined and recorded. After a data sequence, the two logic circuit outputs are placed at the same level, and the subsequent inversion of one output level relative to the other causes the combined levels to reach an intermediate, third level.