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, Pasedena, CA (US);
Abstract
Disclosed is a fast closure method for use in the calibration of a data signal channel, such as the record/reproduce channel of a magnetic tape recorder. The method results in fewer iterations of a calibration procedure which reduces the difference between a measured channel response and a target channel response to bring the channel response within acceptable response limits. According to the method, the control value is originally set at mid range and the channel response measured. If the channel response is too low, the control value is set at 75%, and if the response is too high, the control value is set at 25%. The channel response is measured again and from the last two measured channel responses a transfer slope is calculated. A projected control value is determined from this slope based on the desired response of the channel.