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:
Dec. 31, 1991
Filed:
Mar. 30, 1990
William McSweeney, Saratoga, CA (US);
Ampex Corporation, Redwood City, CA (US);
Abstract
A record current optimization technique includes a magnetic reference tape pre-recorded with a selected frequency at a precisely known level into the tape. A magnetic tape recorder is loaded with the reference tape, and a reference playback level is recovered from the reference tape with a playback head, and is stored or otherwise noted. A recording at the selected frequency then is made with a record head on an unrecorded portion of the reference tape. The new recording is simultaneously read out with the playback head and record current automatically or manually is adjusted until the new playback level matches the reference playback level. A value corresponding to this optimized record current is stored. The record head thus is optimized for any subsequent recording process, by selecting the stored value corresponding to this value. The optimization technique may be employed to optimize record currents in audio, video and data, analog or digital, recorders.