Method and equipment for switching the operating conditions of a

Details Method and equipment for switching the operating conditions of a Method and equipment for switching the operating conditions of a

1975-10-03

1977-07-19

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 69, G11B 547

Patent

active

040372596

ABSTRACT:
This invention concerns methods and devices for switching a tape-recorder or cassette tape-recorder and especially recorders on which tapes with different magnetic coatings can be used. According to the invention, at least one section along the magnetic tape which has a much higher electric resistance than the magnetic coating is used in conjunction with arrangements of simple layout and in advantageous manner to monitor the resistance of the tape either continuously or sporadically, and at least one predetermined switching state of the recorder is allocated to each different resistance value. This ensures reliable switching of any such states as "machine on", "machine off" or "iron oxide (chromium dioxide) tape" bias, without any other special changes at the magnetic tape or at the cassette.

REFERENCES:
patent: 3434725 (1969-03-01), Eibensteiner
patent: 3583617 (1971-06-01), Kosaka
patent: 3588380 (1971-06-01), Horlander et al.
patent: 3694585 (1972-09-01), Goldner
patent: 3800316 (1974-03-01), Kumarchuk

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