Tape sensing device for magnetic tape recording and/or reproduci

Details Tape sensing device for magnetic tape recording and/or reproduci Tape sensing device for magnetic tape recording and/or reproduci

1975-03-06

1977-07-26

Moffitt, James W.

Dynamic magnetic information storage or retrieval

Checking record characteristics or modifying recording...

360 65, 360 66, G11B 545

Patent

active

040386929

ABSTRACT:
A device for sensing the type of magnetic coating on a magnetic tape while the latter is at rest, for example, in a magnetic tape recording and/or reproducing apparatus, has a DC magnetic recording head energizable by a predetermined DC voltage for applying a DC magnetic flux to the tape with which such head is engaged, a magnetic sensing element preferably coupled with the DC magnetic recording head for sensing the remanence or residual magnetism in the tape while the latter remains at rest following the application of the DC magnetic flux to the tape, and a level detector for detecting the level of the sensed remanence of the tape as an indication of the type of magnetic coating thereon. Such level detector may be advantageously employed for controlling a frequency equalizing circuit and/or a bias oscillator included in the signal recording circuit of the recording and/or reproducing apparatus so as to automatically adapt the latter for recording operations on the particular type of tape installed therein.

REFERENCES:
patent: 3200207 (1965-08-01), Rainer et al.
patent: 3588380 (1971-06-01), Horlander
patent: 3601558 (1971-08-01), Sugaya
patent: 3812529 (1974-05-01), Yoichi
patent: 3918088 (1975-11-01), Tabuchi

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