Magnetic tape apparatus and method

Details Magnetic tape apparatus and method Magnetic tape apparatus and method

1980-03-26

1982-03-09

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Tape record

360 741, 360 78, G11B 1518, G11B 1544, G11B 2108

Patent

active

043192912

ABSTRACT:
A continuous play, selectable airliner passenger audio program presentation system employs a plurality of substantially identical Philips cassette playback units, located in a common housing. Each of the units includes an individual drive mechanism, such that the cassette tape is reversed automatically when it is wound on one hub. Transducer coils in a head assembly are selectively energized, depending upon the direction in which the cassette tape is driven, so that a stereophonic audio signal is continuously derived. The cassette tape tracks and the head assembly coils are activated during recording and playback operations in a manner reversed from the usual manner. Thereby conventional cassettes produce garbled messages, tending to prevent pilfering of the cassettes and use of unauthorized cassettes. The cassettes are held in situ by a hold down bar on a hinged cover of the housing.

REFERENCES:
patent: 3140360 (1964-07-01), Whitworth
patent: 3285610 (1966-11-01), Shields
patent: 3533633 (1970-10-01), Wilder
patent: 3641279 (1972-02-01), Ganske
patent: 3647987 (1972-03-01), Trammell
patent: 3766326 (1973-10-01), Buchholz
patent: 3825949 (1974-07-01), Pyles
patent: 3911487 (1975-10-01), Ladriere
patent: 3946160 (1976-03-01), Ano
patent: 4101941 (1978-07-01), Tanaka

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