Method and apparatus for automatically optimizing the record current in a tape recorder using a reference tape
US5077623A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Mar 30, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.