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:
Jan. 02, 1990
Filed:
Oct. 03, 1988
Robert D Andersen, West Covina, CA (US);
Datatape Incorporated, Pasadena, CA (US);
Abstract
A data signal channel, such as a record/reproduce channel of a magnetic tape recorder, is automatically calibrated by means of multiple control signals which are applied to the channel simultaneously. The disclosed technique is fast, accurate, and effective in automatically calibrating a multispeed, multichannel, magnetic tape recorder in an optimum amount of time. A channel to be calibrated is stimulated with a complex wave-form having harmonic content at frequencies where reproduce amplifier equalization controls are effective. The channel response is measured and analyzed into the desired frequency components. A set of error values are determined by calculating the difference between the measured response values and known target response values at the desired frequencies. If the set of error values are not within allowable error limits, new control values are calculated from multiple control equations. The new control values are generated and sent to adjust the equalization controls. The process is reiterated until the calculated errors are within allowable limits for each of the desired frequency components.